Water-cooled Centrifugal Chiller Electric Control Service Manual

Transcription

1 Midea Commercial Air Conditioner Water-cooled Centrifugal Chiller Electric Control Service Manual

2 Maintenance and Operation Instructions for Centrifuge Electric Control This manual applies only to after-sales and technical supports or after-sales services of authorized dealers. 1

3 Contents I Introduction to Electric Part Electric Control Components... 3 II Key Component Settings Thermal Relay Settings of Oil Pump Cabinet Thermal Relay Settings of Closed Star-Delta Startup Cabinet Settings of Phase Sequence Protector Settings of Siemens Controller III System Wiring External Wiring External Wiring of Microcomputer Control Cabinet Remote Start/Stop Control Connection Connection Between Microcomputer Control Cabinet and Inverter Startup Cabinet IV Operations on HMI Welcome Screen Operating Conditions (Main Interface) User Parameter Settings Password Interface User Parameter Setting Interface User Parameter Settings Touch Screen Settings User Parameter Settings Time Settings User Parameter Settings Automatic On/Off After-sales Parameter Settings After-sales Parameter Settings - Sensor Calibration Alarm Interface Historical Alarm Records Status Information Operation Query Guide Vane Control Oil Pump Control V Common Problems and Troubleshooting Self-startup of Oil Pump Star-delta Startup Cabinet Tripping Cause of Upper-end Power Distribution System of Unit and Troubleshooting Guide Vane Fault Sensor Detection Problems Communication Faults Unit Fails to Stop or Start Immediately or Pressing Power/on/off Button Does Not Work No Change in Inverter Unit Frequency VI Common Alarm Contents and Alarm Causes Attachment 1: Installation and Wiring Requirements and Parameter Settings for Scheneider Inverter Cabinet Configured for Inverter Centrifugal Unit Attachment 2: Installation and Wiring Requirements and Parameter Settings for Danfoss Inverter Cabinet Configured for Inverter Centrifugal Unit

4 I Introduction to Electric Part 1.1 Electric Control The electric control system consists of the microcomputer control cabinet, oil pump case (electric heating and oil pump startup cabinet), main motor startup cabinet and all kinds of sensors and executive components. The control system checks the unit operating parameters, controls operation of the unit, and implements corresponding protection for the faulty unit. User power line HMI Temperature/ Pressure/ Current/ Switching value Platinum resistance input module Analog input module Switching value input PLC Control signal Oil pump oil heating control Startup cabinet Oil pump cabinet Centrifugal compressor Oil pump/oil heating Opening feedback Forward/ Reversal rotation Open and close Electric actuator Bypass valve Power supply 1.2 Components Microcomputer cabinet: As the main part of the whole electric control system, the microcomputer cabinet detects information such as the unit temperature and pressure, water flow, current and guide vane opening, accurately controls orderly operation of actuating mechanism such as the actuator, oil pump, oil heating, water pump, water tower, bypass valve and startup cabinet through reasonable logic operations, and displays the abnormal unit status. 3

5 Programmable Logic Controller (PLC) (TM218LDAE40DRPHN): The PLC is the core component of the microcomputer cabinet and can be compared to the human brain. The PLC is a type of programmable storage, which is used for its internal stored programs and can execute instructions such as logic operation, sequential control, timing, calculation and arithmetical operation. Moreover, it controls all kinds of mechanical and electronic devices through digital or analog input/output. Extension module adapter (TM2DOCKN): The extension module adapter is an accessory used for intermediate junction. This accessory aims to simplify the hardware design of PLC body and increase the body commonality and flexibility. 4

6 Analog I/O module (TM2AMM6HT): four lines of 0-10V/4-20mA inputs and two lines of 0-10V /4-20mA outputs; TM2AMI4LT has 4 lines of 0-20mA inputs. Platinum resistance input module (TM2ARI8LT): It directly connects to PT1000 and converts the analog quantity to the digital quantity acceptable by PLC. 5

7 Touch screen (MD1111T): It adopts the 32-digit RISC CPU to rapidly complete data collection, operation and control and functions as the main man-machine interaction part of the unit. A lot of operations can be performed and unit parameters can be read through the touch screen. Current transducer (WBI414S01): The current transformer contains alternating current which cannot be directly read by the controller. This current transducer is used to convert the alternating current into the general 4-20mA DC signal in the industry to read current of the compressor. 6

8 Filter (FN ): This part is used to filter away or reduce harmonic wave in the power supply and can effectively filter away the frequency beyond 50 Hz. Switching power supply (MDR-20-24): It converts the 220V AC into 24V DC so that the 24V power supply can be provided for the touch screen, PLC module, transducer and pressure sensor. 7

9 Fuse base (RT28N-32X): When the small red indicator turns on, it indicates that the fuse core has blown out. You need to replace it with a fuse core of the same model. Oil pump cabinet: This control cabinet independently used for oil heating and oil pump can start/stop the pump and oil heating. Its control signal comes from the microcomputer control cabinet. (The unit produced after July 2014 is not provided with an independent oil pump cabinet.) 8

10 AC contactor 1(LC1-D09M7C): This device can frequently close and break the normal current. After the contactor coil is powered on, the coil current will generate a magnetic field, which enables the fixed core to generate an electromagnetic attraction, attract the moving core, and drive the AC contactor point to act. The normally open contact is closed and used to connect or disconnect the oil pump and oil heating in this cabinet. Thermal relay (LRD-10C): Current generates heats and deforms the bimetallic strips of different expansion systems under the heat effect. When the deformation reaches a certain distance, the connecting rod is driven to act, thus disconnecting the current of the operating coil of main contactor. 9

11 Main motor startup cabinet: This actuating mechanism is controlled by PLC in the microcomputer control cabinet and carries out the compressor start/stop task. Ammeter (similar to the voltmeter in appearance): It displays the current size of phase indicated by the ammeter commutator switch. 10

12 Phase sequence protector (CM-MPS.41): It provides protection for phase loss, undervoltage and phase sequence of the incoming line power supply, so as to prevent damages to the compressor or other components in case of a power failure. Siemens controller (LOGO 230RC): This simplified PLC integrates eight digital inputs and four lines of digital outputs and replaces the traditional switching device. This flexibly set controller can reduce cost and save space. 11

13 Circuit breaker 1: This switching device has the arc extinguishing function and can break the current under abnormal loop conditions. When the loop has faults such as short circuit, undervoltage and serious overload, this circuit breaker can automatically cut off the circuit. In terms of function, it is equivalent to a combination of fuse switch, overvoltage/undervoltage and thermal relay. By the operation mode, this kind of circuit breakers can be classified into electric operation, manual operation and stored energy operation. The figure below shows a circuit breaker of manual operation. Circuit breaker 2: The figure below shows a circuit breaker of electric operation, whose function is the same as that of a circuit breaker of live operation. 12

14 Contactor 2 (LC1D475): It is used to connect or disconnect the normal operating current of the compressor to start or stop the compressor. External components Actuator (DCL-40F): The actuator adjusts opening of the guide vane through forward/reversal rotation of its internal motor. Adjusting the guide vane opening can change the amount of refrigerant entering the compressor, thus changing the unit cooling capacity. 13

15 Temperature sensor PT1000 (AKS21A): Six sensors are available. They are used to respectively detect the cooling water inlet, cooling water outlet, chilled water inlet, chilled water outlet and oil supply temperatures, as well as the oil tank and exhaust temperatures. Pressure transducer (AKS33): Four pressure transducers are available. They are used to respectively detect the oil tank, condenser, evaporator and oil supply pressures. 14

16 II Key Component Settings 2.1 Thermal Relay Settings of Oil Pump Cabinet The thermal relay of oil pump cabinet is used for overload protection of the oil pump motor. The thermal relay is directly connected to the main loop of oil pump motor in series. Figure 2.1 shows the wire connection. The set protection value I z is usually 1.05 to 1.15 times of the rated current I e of oil pump motor. The 1.75 kw oil pump motor is configured for Ruixing series LC350M-LC1500M centrifuges. The specification of its thermal relay is 4-6A, and the set overload protection value is A. The reset mode is set to manual reset by default. Figure 2.1 Thermal relay connected to the main circuit 15

17 2.2 Thermal Relay Settings of Closed Star-Delta Startup Cabinet The thermal relay in the closed star-delta startup cabinet is used for overload protection of the main motor of centrifuge, and the tripolar load current of thermal relay comes from the secondary current of the startup cabinet current transformer, as shown in Figure 2.2. Its motor overload protection current value should be converted to secondary-side I2 of the current transformer, and then set according to 1.05 to 1.15 times of its value. Table 2.1 provides the specific set value. The reset mode is set to manual reset by default. Figure 2.2 Tripolar load current of thermal relay from the secondary current of three-phase current transformer Master unit model Startup cabinet model Transformation ratio of current transformer Thermal relay specification Set overload protection value LC350M LC400M QSFSB54(320)(JB) 800/ A 3.58 LC450M LC500M QSFSC54(410)(JB) 1000/ A 3.68 LC550M QSFSD54(474)(JB) 1200/ A 3.54 LC600M LC650M LC700M LC750M QSFMB54(522)(JB) 1200/ A 3.10 LC800M LC850M QSFMC54(596)(JB) 1500/ A 3.54 QSFMD54(670)(JB) 1500/ A 2.99 LC900M LC950M LC1000M QSFME54(740)(JB) 2000/ A 3.30 LC1100M QSFMH54(808)(JB) 2000/ A 3.19 LC1200M QSFMF54(894)(JB) 2000/ A 3.21 LC1300M QSFLB54(979)(JB) 2500/ A 3.51 Remarks Adjusted on the field and subject to the set value of shop trial 16

18 LC1400M LC1500M Maintenance and Operation Instructions for Centrifuge Electric Control QSFLC54(1043)(JB) 2500/ A 3.74 Table 2.1 Thermal relay settings of the closed star-delta startup cabinet 2.3 Settings of Phase Sequence Protector The CM-MPS.41 phase sequence protector of ABB is adopted for the phase sequence protector in the closed star-delta startup cabinet, as shown in Figure 2.3. It provides the overvoltage, undervoltage, phase lack, phase inversion, and imbalance protection function. Table 2.2 provides its protection settings and action indications. 1-R/T: The yellow LED indicates the relay status (timing status). 2 and 3-F1 and F2: The red LED indicates fault information. 4-Action delay settings 5-Overvoltage protection settings 6-Undervoltage protection settings 7-Phase imbalance protection settings 8-DIP function selection/tag plate 17

19 Figure 2.3 CM-MPS.41 phase sequence protector Protection item Definite action value range Definite time value (t v) DIP 1 settings Action Reset delay delay Factory settings Action indication Remarks Overvoltage protection Undervoltage protection Phase imbalance V 0-30S ON OFF 420V F1 normally on The response V 0-30S ON OFF 340V F2 normally on delay and reset delay F1 and F2 2%-25% 0-30S ON OFF 5%-7% can be set. normally on Phase lack protection Phase sequence protection Valid -c Valid F1 normally on and F2 blinking Action and F1 and F2 blinking reset without delay alternatively Definite value setting overlap R/T, F1 and F Valid blinking The factory settings can be adjusted according to the field power quality. Remarks Imbalance threshold Maximum difference of L1, L2 and L3 Average value of L1, L2 and L3 Table 2.2 Protection settings and action indications of the phase sequence protector DIP switch function settings of the phase sequence protector: DIP switches are classified into DIP1 and DIP2. DIP1 is used for action and reset delay settings; DIP2 is used for phase sequence monitoring enable settings. When DIP1 is ON, if the action conditions are met, the action is delayed according to the set time; if the reset conditions are met after the action, resetting is preformed instantaneously. When DIP1 is OFF, if the action conditions are met, the action is performed instantaneously without delay; if the reset conditions are met after the action, resetting is delayed according to the set time. When DIP2 is ON, phase sequence monitoring is invalid, applicable to the three-phase equipment (e.g., a three-phase electric heater) without any phase sequence requirement; when DIP2 is OFF, phase sequence monitoring is valid, applicable to the three-phase equipment (e.g., a three-phase asynchronous motor) with phase sequence (rotation direction) requirements. Figure 2.4 shows the DIP1 and DIP2 factory settings. 18

20 DIP1-ON; DIP2-OFF Figure 2.4 DIP switch function settings of the CM-MPS.41 phase sequence protector 2.4 Settings of Siemens Controller Siemens controller LOGO 230RC is usually used to protect the high-voltage startup cabinet and motor. Non-professionals cannot adjust the internal set protection value at will. Its function input/exit and set values are based on the shop trial parameters. III System Wiring 3.1 External Wiring The incoming/outgoing line for the power circuit of startup cabinet can be classified into 380V, 6kV and 10kV according different rated voltages of main motors. For the power wiring of Ruixing series centrifuges, see Table 3.1. Model Incoming line (380V) of QSF series startup cabinet Outgoing line (380V) of QSF series startup cabinet LC350M 2*BVR150 BVR185 LC400M 2*BVR150 BVR185 LC450M 2*BVR240 BVR300 LC500M 2*BVR240 BVR300 LC550M 2*BVR300 2*BVR120 LC600M 2*BVR300 2*BVR120 LC650M 2*BVR300 2*BVR150 LC700M 2*BVR300 2*BVR150 LC750M 3*BVR240 2*BVR185 LC800M 3*BVR240 2*BVR185 LC850M 3*BVR240 2*BVR240 LC900M 3*BVR240 2*BVR240 LC950M 3*BVR300 2*BVR240 LC1000M 3*BVR300 2*BVR240 LC1100M 4*BVR240 2*BVR300 19

21 LC1200M 4*BVR240 2*BVR300 LC1300M 4*BVR300 3*BVR185 Model Incoming/Outgoing line (6kV) of QZF series high-voltage startup cabinet Incoming/Outgoing line (10kV) of QZF series high-voltage startup cabinet LC650M YJV 2235 YJV 2235 LC700M YJV 2235 YJV 2235 LC750M YJV 2250 YJV 2235 LC800M YJV 2250 YJV 2235 LC850M YJV 2250 YJV 2235 LC900M YJV 2250 YJV 2235 LC950M YJV 2250 YJV 2235 LC1000M YJV 2250 YJV 2235 LC1100M YJV 2270 YJV 2250 LC1200M YJV 2270 YJV 2250 LC1300M YJV 2270 YJV 2250 LC1400M YJV 2250 LC1500M YJV 2250 LC1600M YJV 2270 LC1700M YJV 2270 Table 3.1 Wiring of Ruixing series centrifuges Notes: The incoming/outgoing lines in Table 4.1 adopt the specifications (and quantity) of cables connected for each phase of the startup cabinet. The cables used in parallel for the same phase should be consistent in the cross section, material, length and laying environment, so as to avoid cable overheating arising from severe uneven shunting. The operating temperature of the core selected for the above 380V cable is 70 o C, the ambient temperature is 40 o C, and the laying method is single-cable air installation. The operating temperature of the cores selected for the above 6kV and 10kV cables is 70 o C, the ambient temperature is 40 o C, and the laying method is three-core air installation. For the cross-linked polyethylene insulate power cables (YJV22) with steel tape armoured cross-linked polyethylene sheaths, the installation and laying requirements are as follows: (1) Peeling length of the external sheath of cable: 550 mm (indoor)/750 mm (outdoor), as shown in Figure 3.1. (2) Cable bending radius: 15 (D+d)±5% (D: actual outer diameter mm of cable; d: actual outer diameter mm of conductor). (3) The entrance hole of the junction box needs to fully accommodate the cable terminal. 20

22 (4) The cable terminal needs to be made by a professional. It can be put into use only after passing the voltage withstand test and being accepted by relevant department through check. (5) The cover plate of the junction box needs to be covered after cables are laid and crimped. The entrance hole of the junction box should be sealed with fire-proof clay. Steel shielding layer Indoor 550 Outdoor 750 Inner cushion layer Armour PVC sheath Figure 3.1 External sheath peeling length mm of the YJV 22 power cable The cross section of the protective grounding wire should meet the requirements for reliable actions of the circuit protector and comply with the minimum allowed section area (mm 2 ) of the protective grounding wire as per thermal stability requirements in Table 3.2. Section area of the protective conductor (PE) Section area S (mm 2 ) of the phase conducting wire S 16 Minimum section area S p of corresponding protective conductor S 16<S <S 400 S/2 400<S <S S/4 Table 3.2 Section area selection of the protective conductor 3.2 External Wiring of Microcomputer Control Cabinet External wiring of the microcomputer control cabinet covers the switching value, analog quantity, resistance signal and communication cable, involving both AC and DC. This requires separate laying of the external wiring, power cables and AC/DC conducting wires or laying through metal tubes. 21

23 Master unit switching Microcomputer control cabinet Master unit current Master unit starter Master unit fault Master unit operating Oil pump Oil heating N line Oil pump overload Null line Live line Opening valve Closing valve Opening Oil pump control box Electric actuator Oil pump Heater Main motor Figure 3.2 Wiring diagram for the electric control system of Ruixing series centrifuges The external wire connection between the microcomputer control cabinet and startup cabinet is a little different according to different startup modes. It consists of four groups of external wire connection: master unit switching, master unit current, master unit operating, and master unit fault. (1) Closed star-delta startup cabinet Since the distance is far, the cross section should be increased properly for the conducting wire between the two. In particular, for the 0-5A current signal, be aware to prevent the wire resistance from exceeding the current transformer capacity and leading to a greater measurement error. The weak current loop and signal loop conducting wires should be laid separately from the power circuit. In case of cross wiring, the cross orthogonal mode is preferred to reduce parallel stacking of laid cables. In field installation and debugging for the user, take proper grounding measures for the 22

24 microcomputer control cabinet, master unit startup cabinet and oil pump case according to international requirements, and avoid faults such as sensor measurement errors and false alarms; select a cross section of grounding wire according to Table 4.2, and select a length as short as possible. An intermediate relay must be used for transit separation when the microcomputer control cabinet is interlocked with the external water pump and cooling tower fan to control its main loop contactor. Do not directly drive the contactor coil. Figure 4.3 shows the connection between the microcomputer control cabinet and the water pump/cooling tower fan. PCS control cabinet Intermediate relay Active contact output of control cabinet AC contactor Diagram of water pump/cooling tower fan control Water pump/ cooling tower fan 1. Connect the water pump/cooling tower fan according to requirements in the figure. An intermediate relay must be used for transit. Do not directly drive the contactor coil. 2. If the linkage control function of water pump/cooling tower fan is not used, make sure that the water pump has started before the unit is turned on. 3. The water pump/cooling tower fan must be separately powered, and the power supply cannot be led out from the power inlet of the unit. Figure 3.3 Control connection with the water pump/cooling tower fan 3.3 Remote Start/Stop Control Connection The microcomputer control cabinet can implement remote start and stop of the unit through parameter settings. This can also be realized using the remote switching value and communication mode. (1) Remote control by using the switching value applies to various control signal types (holding type and pulse type). First enter the user setting interface (40828), and press the Remote button in the control mode options. When remote control is displayed in the system status, you can use the switching value to implement remote control, as shown in Figure

25 Figure 3.4 Selecting remote control Then, enter the after-sales parameter interface (36171) to select a remote power-on/off type, as shown in Figure 3.5. Figure 3.5 Selecting a remote power-on/off type Connect the remote power-on input point to the corresponding connecting terminal of the microcomputer control cabinet by referring to the wire connection diagram of the electrical schematic diagram (as shown in Figure 3.6). When the remote power-on/off type is set to 24

26 Pulse Mode, remote power-on and remote power-off should be separately controlled using the Pulse Mode switch; when the remote power-on/off type is set to Hold Mode, only the remote power-on terminal node needs to be linked, it is the power-on status when the closing signal is held, but the power-off status after the signal is disconnected. KA1 KA2 Remote power-off Remote power-on 1 Power-on ON Holding 2 Power-off OFF 1 Power-on OFF OFF to ON 2 Pulse transient OFF to ON Power-off OFF transiently Figure 3.6 Wire connection for remote power-on/off (2) This control system can connect to the upper computer in the communication mode and implement remote control. We adopt the standard Modbus-RTU communication protocol and RS485 communication interface. The specific operations are as follows: Enter the user parameter interface (40828), and press Serial Port Setting, as shown in Figure 3.7. On the serial settings interface, set the communication parameters such as the baud rate, site number, data bit, stop bit, and check bit, as shown in Figure 3.8. Figure 3.7 Selecting serial settings 25

27 Can be set Figure 3.8 Interface of serial settings After setting the parameters on the interface of serial settings, press the Set Serial Port Information button. After setting, press the Read Serial Port Information button to display whether each parameter is correctly set. Figure 3.9 shows the RS485 connection mode. Figure 3.9 RS485 connection terminal 26

28 3.4 Connection Between Microcomputer Control Cabinet and Inverter Startup Cabinet Currently, the microcomputer control cabinet employs the control system using Scheneider PLC as a core. In its standard configuration, Midea, Danfoss and Scheneider inverter cabinets are selected. The external wire connection for the microcomputer control cabinet and inverter cabinet is introduced below: (1) Figure 3.10 shows the connection between Midea inverter cabinet and microcomputer control cabinet. Master unit start/stop Master unit current Microcomputer control cabinet Given frequency Midea inverter cabinet Master unit fault Master unit operating Main motor Figure 3.10 Connection between Midea inverter cabinet and microcomputer control cabinet (2) Figure 3.11 shows the connection between Danfoss inverter cabinet and microcomputer control cabinet. 27

29 RS485 communication Master unit start/stop Microcomputer control cabinet Master unit current Given frequency Danfoss inverter cabinet Master unit fault Master unit operating Main motor Figure 3.11 Connection between Danfoss inverter cabinet and microcomputer control cabinet (3) Figure 3.12 shows the connection between Scheneider inverter cabinet and microcomputer control cabinet. RS485 communication Master unit start/stop Microcomputer control cabinet Master unit current Given frequency Scheneider inverter cabinet Master unit fault Master unit operating Main motor Figure 3.12 Connection between Scheneider inverter cabinet and microcomputer control cabinet 28

30 The figure below shows the network cable connection port (connected to the PLC and inverter cabinet) of Scheneider inverter cabinet: IV Operations on HMI Power-on for the first time Before powering on the unit for the first time, make sure to confirm that the connection wire from the user-side air switch to the control box is connected firmly, the insulation resistance between five wires reaches requirements, and the unit is grounded. Connection wires in the control box may get loose during transportation, so it is required to check the connection wires of all the connecting terminals when the power supply is disconnected, and confirm that they are connected firmly. Check whether there is a sufficient power supply capacity to satisfy startup and full-load operation of the unit. Check whether the red emergency stop button on the control box is in the natural release status. 29

31 Welcome screen Tree diagram of the touch screen interface Main interface Parameter settings (Password input) Note: To access the white window, enter the user password (58806) or user management password (40828) on the main interface. The user management password (40828) can be used to access the lilac window. The after-sales personnel need to contact the factory to get the after-sales password. Parameter settings (Password input) Alarm information Status information User parameter settings Historical alarm records Historical alarm records Time settings Touch screen settings Automatic on/off Temperature and pressure display Input status Output status Remark: Do not implement remote control through disassembling of the screen and extended communication cables without permission. Because a unit failure may occur due to the signal interference caused by this mode. We assume no liability or responsibility for any damage or consequence arising from this operation. Customers with the requirement for remote control can apply for a customized configuration to us. This control system uses a touch screen. All the operations are directly performed on the touch screen. 30

32 4.1 Welcome Screen Maintenance and Operation Instructions for Centrifuge Electric Control The first welcome screen appears after the system is powered on, as shown in Figure 4.1. Clearing key Backspace key Power indicator PLC and HMI program version No. Running indicator Communication indicator Figure 4.1 Press the button to display the password input keyboard. The user needs to enter 58806/40828, and the after-sales personnel need to enter the after-sales password. Then, press the ENTER key on the keyboard to enter the main interface. Description of the right indicators: 1 The yellow indicator is the power indicator, which is normally on. If it is off, check whether the power cable is correctly connected. 2 The green indicator is the touch screen running indicator, which blinks at a low frequency in the normal status. 3 The red indicator is the communication indicator, which blinks at a high frequency in the normal status. If not, check whether the communication cable connected to the PLC is correctly and firmly connected. 31

33 4.2 Operating Conditions (Main Interface) Maintenance and Operation Instructions for Centrifuge Electric Control After the main interface is displayed, the operating condition interface on the main screen is shown in Figure 4.2. Figure 4.2 The date and time are displayed at the upper left part of the main interface. The unit operation status is classified into local (near control), remote control and automatic on/off. The displayed unit status is classified into the standby status, being started, normal operating, suspended status, being shut-down status, and accidental shutdown. 1 Standby status: After the unit is powered on, the standby status is displayed in the normal condition. 2 Being started: The unit starting process. 3 Normal operating: The unit has started and entered the operating status. 4 Suspended status: When the water temperature for the first startup of the unit is not reached or the water temperature is controlled lower than the water temperature for suspension of the unit, the unit enters the suspended status and the compressor stops operating; after the water temperature is controlled higher than the compressor startup temperature, the compressor starts and enters the unit operating status. 5 Being shut-down status: After the shutdown operation, the unit enters the being shut-down status. After shutdown, the unit enters the standby status. 32

34 6 Accidental shutdown: When a fault alarm is reported for the unit, the unit enters unit protection. The alarm can be queried in the alarm information. 7 Power-on operation, pressing the power-on button is effective when the unit is in the local and no-fault status, and the unit shutdown delay and the controlled water temperature are satisfied; otherwise the unit will not start. Press the button to display the power-on confirmation window. The unit will be powered on after confirmation, as shown in Figure 4.3. Figure 4.3 When the unit startup water temperature is not reached, the unit starts the water pump and then enters the suspended status. The interface displays The water temperature is not reached now, so the unit cannot start. If the unit shutdown delay is insufficient, the upper right area of the interface displays The unit shutdown time is not reached. ### S are left. Power-off operation: Press the button to display the power-off confirmation window, as shown in Figure 4.4. Press the Confirm button. The displayed unit status is being shut-down. After the unit meets the shutdown conditions, the power-off process is executed. Figure 4.4 Press to go to the welcome screen. 33

35 4.3 User Parameter Settings Password Interface On the main interface, press to display the password input interface. Enter the password (40828) to access the user parameter setting interface. Figure 4.5 shows the password input interface. Figure 4.5 The dialog box shown in Figure 4.6 is displayed if the input password is wrong. Press to return to the input interface, and enter the password again. Figure

36 4.4 User Parameter Setting Interface After the password (40828) is entered, the accessed interface is shown in Figure 4.7. Can be entered manually Figure 4.7 The data format can be directly set. MAX at the upper left part of the setting window is the upper limit of set parameter, and MIN is the lower limit of set parameter (the value exceeding the range cannot be accepted). Press the ENT key to confirm the input or the CLR key to cancel the input. Then, the numerical input keyboard disappears. Term explanation: Control target temperature: It indicates the target value of controlled water temperature. In the cooling mode, the compressor will start only when the controlled water temperature is greater than the target temperature; otherwise the unit will not start. Control mode selection: When local (near control) is selected, unit start/stop can be controlled only on the touch screen or upper computer, but the unit cannot be started/stopped through the remote switch. When remote control is selected, unit start/stop can be controlled only through the remote switch, but the unit cannot be started/stopped though the touch screen. When automatic on/off is selected, unit start/stop can be controlled only through automatic 35

37 on/off settings, but the unit cannot be started/stopped though the touch screen or remote switch. 4.5 User Parameter Settings Touch Screen Settings In Figure 4.7, press the button to access the touch screen setting interface. Jog adjustment Figure User Parameter Settings Time Settings In Figure 4.7, press the button to access the time setting interface. Can be entered manually 36

38 Figure 4.9 Press the value box to set to display the value input keyboard, enter the corresponding time, and press ENT to save the value. ESC is used to cancel the input. The value takes effect upon input. Press to exit this interface. Note: The time and date to be set must actually exist. We assume no responsibility for any consequence brought about by settings of nonexistent time and date. 4.7 User Parameter Settings Automatic On/Off If users need to use the automatic on/off function, the interface shown in Figure 4.10 appears only when is selected in the control mode options on the interface. Figure 4.10 Press to enter the interface shown in Figure

39 Can be entered manually Job switching Figure 4.11 Users can set the desired automatic power-on/off time within one week. The unit will be powered on/off at the specified time. If continuous operating of the unit is required, for example, the unit needs to operate from 10:00 on Tuesday to 16:00 on Thursday, users can set the automatic on time of Tuesday to 10:00, set the power-off time to 0:0 (note: the set automatic on time must be earlier than the automatic off time), and switch the button to ; set the automatic on time on Thursday to 0:0 (note: the automatic on time must be earlier than the automatic off time), set the automatic off time to 16:00, switch the button to, and set all the other time buttons to. Since automatic on/off time is based on the local unit system time, note to check the system time when using the timing function. 4.8 After-sales Parameter Settings When the after-sales password is set on the password interface of parameter settings, enter the after-sales parameter setting interface, as shown in Figure

40 Setting button displays the current use status Figure 4.12 The remote power-on/off type is classified into the jog type and holding type. Select one according to the switch type. The startup cabinet switching mode is classified into the holding type and pulse type. Select one according to the startup cabinet switching signal sending mode. Press Clear Alarms to delete all the alarm messages recorded in the alarm window. Press Clear Alarm Records to delete all the alarm messages recorded in the historical alarm window. Press Return Operation Time to Zero to clear the recorded compressor operation time. 4.9 After-sales Parameter Settings - Sensor Calibration On the after-sales parameter settings interface, press to perform calibration settings. 39

41 Figure Alarm Interface On the main interface, press the button to access the real-time alarm interface, as shown in Figure 4.1. Figure

42 If an alarm is reported, the unit will carry out the action according to the fault procedure. After all the faults are eliminated and the fault shutdown process has been completed, press the button to restore the system to the normal status. The unit fault on the main interface disappears. When more fault contents exist, press and to view faults. Red indicates the fault not eliminated; white indicates the fault already eliminated. Notes: 1 The high pressure protection switch cannot be reset automatically. You need to find the high pressure protection switch (installed on the unit) and manually reset it. 2 Overload protection cannot be reset automatically. You need to find the thermal relay in the electrical control cabinet and manually reset it Historical Alarm Records On the alarm interface, press to enter the record interface, which records alarms during operation of the compressor. As shown in Figure 4.2, at most 10 alarm records can be kept. When there are more than 10 alarm records, the interface will be updated automatically. Figure

43 Press to observe the I/O status during the alarm. Figure Status Information Operation Query On the main interface shown in Figure 4.2, press Figure to enter the interface shown in Remarks: The observed status information varies with the main interface accessed by entering the after-sales password and user password respectively. The after-sales personnel can observe the unit status more conveniently. 42

44 Figure 4.17 The real-time values of all unit parameters are displayed on this interface. Press to observe the unit I/O status. Figure 4.18 Status page: ON indicates that this input point is closed; OFF indicates that this input point is disconnected. 43

45 4.13 Guide Vane Control Maintenance and Operation Instructions for Centrifuge Electric Control On the interface shown in Figure 4.2, press to enter the manual control interface of guide vane. Figure 4.19 When the guide vane is under manual control, the guide vane is mainly manually controlled by the user. Manual control will change to automatic control in the following cases: 1 The evaporator outlet water temperature is higher than the target outlet water temperature + 1 C or the evaporator outlet water temperature is lower than the target outlet water temperature - 1 C. 2 When the upper limit of master unit current is reached, the guide vane opening increasing instruction will be restricted. 3 When the master unit current is greater than or equal to load limit x 105%, all the guide vane action instructions will be restricted to automatically reduce opening of the guide vane Oil Pump Control On the interface shown in Figure 4.2, press to enter the manual control interface of oil pump. Figure 4.20 Notes: 1 The oil pump cannot be manually controlled in the starting, operating or shutdown 44

46 status. 2 After the oil pump stop signal is generated, when the master unit current is greater than or equal to 10% of the rated current, the oil pump continues interlocked operation. Please check the unit. Please refer to the actual operation interface. In case of any change, a notice will not be sent in advance. V Common Problems and Troubleshooting 5.1 Self-startup of Oil Pump In the standby status, if operating signal feedback is detected, the oil pump will start to implement protection. This symptom may be caused by two reasons: line interference and control cable insulation aging. Fault name Fault principle Fault cause Troubleshooting The controller The control cable is affected by line interference. Isolate the interference source or replace the shielded cable. The oil pump starts automatically in the standby status. detects an operating signal and starts the oil pump to protect the compressor. The control cable insulation has aged. Replace the control cable with one of better quality. If the start/stop control and operation detection of several units are wired in the same insulating sheath, the wires should be separated. 5.2 Star-delta Startup Cabinet List of Faults Symptom Fault judgment Troubleshooting Remarks Contactor problem status Check the contactor status (which can be viewed through LOGO). None of the contactors will start in case of pull-in feedback. LOGO not reset due to a fault Power on the secondary circuit again. Startup cabinet fails to start Thermal relay not reset Reset it manually. The logo is not powered on in this case. Power protection module not reset Reset the component. The logo is not powered on in this case. External wire connection problem Check the wire connection. 45

47 The startup cabinet cannot complete the startup process. During the startup, all the contactors trip, and the master unit reports the alarm on too-long startup time. Maintenance and Operation Instructions for Centrifuge Electric Control Contactor action failure Locate the specific fault through the LOGO alarm point. Focus on the auxiliary contacts of contactors in the check. When the startup cabinet starts the unit, all the contactors trip unexpectedly, and then pull in suddenly to continue to start the unit. Action of the power protection module Check the power supply quality and distribution capacity. The fault may be caused by voltage drop during the startup. (1) Action logic Startup After the startup cabinet gets the startup signal, KM1 pulls in; after KM1 pulls in, KM2 pulls in immediately; after KM2 pulls in and after a delay of 19s (which can be set), KM3 pulls in; after KM3 pulls in and after a delay of 0.3s, KM1 is disconnected; KM4 pulls in after KM1 is disconnected for 0.3s, and KM3 is disconnected after KM4 pulls in for 0.3s, when KM2 and KM4 maintain the pull-in status and the startup action is completed. Note: The LOGO controller will refuse startup once detecting exception of the contactor status. Stop When the startup cabinet receives a stop signal, all the contactors will trip regardless of the status of the startup cabinet. (2) Fault protection There are seven star-delta startup cabinet faults: KM1 pull-in action fault, KM2 pull-in action fault, KM3 pull-in action fault, KM4 pull-in action fault, KM1 breaking action fault, KM4 breaking action fault, and LOGO power loss. For resetting of all the faults, the LOGO needs to be powered off and restarted (the secondary circuit is powered on again). Besides, when KM2 or KM4 is disconnected unexpectedly during operation, the startup cabinet stops due to a fault; when the location of each contactor is abnormal in the standby status, the startup cabinet cannot start. Fault name Fault description Fault (startup) protection Fault protection Fault record KM1 pull-in action fault The pull-in status feedback is not detected in a delay of 0.3s after the KM1 pull-in instruction is sent. The startup process is terminated, and all the contactors are broken immediately. All the contactors are broken immediately. M1 46

48 KM2 pull-in action fault KM3 pull-in action fault KM4 pull-in action fault KM1 breaking action fault KM3 breaking action fault LOGO power loss Maintenance and Operation Instructions for Centrifuge Electric Control The pull-in status feedback The startup process is All the is not detected in a delay of terminated, and all the contactors are M2 0.3s after the KM2 pull-in contactors are broken broken instruction is sent. immediately. immediately. The pull-in status feedback is not detected in a delay of 0.3s after the KM3 pull-in instruction is sent. The pull-in status feedback is not detected in a delay of 0.3s after the KM4 pull-in instruction is sent. The breaking status feedback is not detected in a delay of 0.7s after the KM1 breaking instruction is sent. The breaking status feedback is not detected in a delay of 0.7s after the KM3 breaking instruction is sent. LOGO power loss (I2 is disconnected; the possible cause is protection of the thermal relay and power protection module) The startup process is terminated, and all the contactors are broken immediately. The startup process is terminated, and all the contactors are broken immediately. The startup process is terminated, and all the contactors are broken immediately. The startup process is terminated, and all the contactors are broken immediately. All the contactors are broken immediately. All the contactors are broken immediately. All the contactors are broken immediately. All the contactors are broken immediately. All the contactors are broken immediately. All the contactors are broken immediately. M3 M4 M5 M6 Q6 Note: The fault record is added after the MD10.11 program version. After the system is powered on again, the M-type fault record can be still kept, and the I8 connected status fault is reset (the professional engineer uses a shorting stub to complete the operation; note that the voltage is 220V); the Q-type fault record is reset after the system is powered on again. 5.3 Tripping Cause of Upper-end Power Distribution System of Unit and Troubleshooting The load of Midea's startup cabinet is the motor, whose startup curve differs from that of the power distribution system. Therefore, a delay of 0.3s needs to be added for current quick-breaking protection of the high-voltage power distribution cabinet at the front end of the unit. Fault name Fault cause Troubleshooting Tripping of the front-end high-voltage power distribution system Tripping of the front-end low-voltage power distribution The front-end distribution capacity is low and cannot meet the unit requirement. There is a deviation in the front-end protection settings, because the motor startup features are fully considered. The main motor or back-end power distribution equipment fails. Low distribution capacity The startup impact time is too long because of the low distribution voltage. Increase the distribution capacity. Add a delay of 0.3s to current quick-breaking. Locate the fault and fix the problem. Increase the distribution capacity. Adjust the distribution voltage. 47

49 system (star-delta startup cabinet at the back end) Maintenance and Operation Instructions for Centrifuge Electric Control The main motor or back-end power distribution equipment fails. Locate the fault and fix the problem. 5.4 Guide Vane Fault The air inlet part of the compressor changes the amount of refrigerant sucked into the compressor by changing the guide vane opening. The guide vane opening is changed through the guide vane actuator, so the guide vane actuator is the important mechanical executive component in the entire unit and shows the combination of mechanical and electronic technologies. The fault of any position in the mechanical part and electronic part may lead to a guide vane fault. Set out below are common fault types: Symptom Fault judgment Troubleshooting Remarks The guide vane can be manually opened or closed normally, but opening is never displayed in the opening/closing process. The unit reports the alarm on wire disconnection of guide vane opening. The positive and negative directions of the opening feedback cable are inversely connected. The actuator module is burnt. Adjust the wires. Replace the actuator module. The problem occurs in the debugging process only. The module provides the function of location feedback only, and has nothing to do with whether the actuator can be opened or closed. The guide vane action is abnormal in the debugging process, that is, the actuator cannot be opened or closed, or can be opened only but cannot be closed, or can be closed only but cannot be opened. The L wire and N wire of actuator module are inversely connected. The intermediate relays (KA3 and KA4) are damaged. There are opening/closing operation wiring problems (wire connection error, missing wires) There are wire connection problems, e.g., wires are not connected tightly. Adjust the wires. Replace the intermediate relays. Correctly connect the wires. Correctly connect the wires. The problem occurs in the debugging process only. The guide vane can be normally opened/closed in the power-off status; after the master unit starts, the guide vane opening/closing action fails, or the guide vane is stuck in a position and cannot act, but the opening feedback is normal. The mechanical part of the unit is jammed. The actuator torque decays. The internal transmission part of the actuator is damaged. Replace the capacitor or actuator. Replace the actuator. If the guide vane cannot be opened or closed, the rocking bar can be used to rock the actuator and observe whether the opening feedback is normal. Once there is feedback current, the module problem can be eliminated. Abnormal sound is also sent when the fault occurs. This type of fault seldom occurs. 48

50 After shutdown, the unit reports the alarm on wire disconnection of guide vane opening. Opening is still displayed when the guide vane is opened manually. The guide vane fault is reported when the unit shuts down. When the guide vane opening is observed at that time, 1%-3% of opening is usually displayed. The actuator works properly, but it gets seriously hot. Maintenance and Operation Instructions for Centrifuge Electric Control The module potentiometer is displaced due to vibration, leading to drift of the guide vane. KA1 and KA2 wires are wrongly connected. Fix the zero and full adjusting potentiometer knobs with 703 silica gel. Change KA1 and KA2 from the normally closed status to the normally open status, and then adjust the KA1 and KA2 connection wires for the actuator. Do not replace the actuator. Power on the unit to operate. This fault seldom occurs. Silica gel is applied to the zero and full adjusting potentiometer knobs 5.5 Sensor Detection Problems The detection sensor for the centrifuge analog quantity is classified into the temperature type and pressure type. If a temperature or pressure detection fault is found, you need to judge whether it is caused by a sensor problem or detection channel problem. The PT1000 temperature sensor is adopted, and its quality can be judged by using a multimeter to measure the resistance value. Use a multimeter to directly measure the resistance value of PT1000. If it is apparently inconsistent with the corresponding resistance value of the current temperature, possibly the temperature sensor has been damaged; the pressure transducer is judged using the channel replacing method, i.e., the sensor of unknown status is connected to a normal channel to observe the parameter detection status and judge whether it fails. Note that, after recovery of an oil tank temperature fault, the oil tank 49

51 temperature can be normally displayed only after it is reset in the fault browse. PT1000 reference table Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance Communication Faults The data in the PLC is transmitted to the touch screen for display, and the operation on the touch screen is transmitted to the PLC through data communication. All the data is transmitted through a data line. When the data line is smooth and the communication address is correct, the PLC can get a correct reply. If it cannot get a correct reply, a communication fault has occurred. Fault name Fault cause Troubleshooting The touch screen cannot communicate with the PLC. The communication cable (standard network cable) plug gets loose or is damaged. The communication module of touch screen is damaged. The PLC communication module is damaged. Insert the plug tightly or replace the network cable. Replace the touch screen. Replace the PLC. 50

52 5.7 Unit Fails to Stop or Start Immediately or Pressing Power/on/off Button Does Not Work Start and stop can be executed only when certain conditions are satisfied. Pressing the power-on button is effective when the unit is in the local and no-fault status, and the unit shutdown delay and the controlled water temperature are satisfied; otherwise the unit will not start. Satisfying the controlled water temperature means that the controlled water temperature is higher than the set target temperature in the cooling mode, and the controlled water temperature is lower than the set target temperature in the heating mode. If there is no response when the power-on/off button is pressed on the screen, the cause can also related to the selected mode. If the local (near control) mode is selected, unit start/stop can be controlled only on the touch screen or upper computer, but the unit cannot be started/stopped through the remote switch; if the remote control mode is selected, unit start/stop can be controlled only through the remote switch, but the unit cannot be started/stopped though the touch screen; if the timing mode is selected, unit start/stop can be controlled only through automatic on/off settings, but the unit cannot be started/stopped though the touch screen or remote switch. 5.8 No Change in Inverter Unit Frequency The unit prefers frequency adjustment over energy scheduling. When the pressure is relatively high (e.g., the cooling water temperature is too high), however, the unit will first adjust the guide vane opening through energy scheduling, and then judge whether to adjust the frequency through calculation. Therefore, it is normal if the frequency does not change in this situation. VI Common Alarm Contents and Alarm Causes Alarm name Symptom Action 1. After the oil pump starts completely in the startup process and after the Failed to establish the startup oil pressure difference delay of Time of establishing startup oil pressure difference, the oil pressure difference is smaller than the set value of Oil pressure difference during startup. 2. After the delay of Time of establishing startup oil pressure difference and when the oil pressure difference is greater than or equal to the set value Startup terminated 51

53 of Oil pressure difference during startup, the set value of Oil pressure difference during startup cannot be maintained in the Oil pressure difference holding time. Remark: Oil pressure difference = Oil supply pressure Oil tank pressure. Oil pressure difference on the low side Excessively low oil pressure difference Excessively low oil tank oil temperature High oil cooling temperature difference Oil supply temperature on the high side Excessively high oil supply temperature Oil pump overload Chilled water outage protection Cooling water outage protection Chilled water anti-freezing outage protection Excessively low main motor current Main motor current on the high side Excessively high main motor current Excessively long startup time Startup cabinet fault Main motor winding superheat Evaporation pressure on the low side After the compressor starts completely, the oil pressure difference is smaller than 100 kpa for continuous 5s. After the compressor starts completely, the oil pressure difference is smaller than 80 kpa for continuous 3s. In the startup process, the oil tank oil temperature is lower than the set value of Excessively low startup oil temperature. During the operation, the difference of the oil tank oil temperature minus the oil supply temperature is higher than 25 C for continuous 3s. During the operation, the oil supply temperature is higher than 58 C for continuous 5s. During the operation, the oil supply temperature is higher than 62 C for continuous 3s. The thermal relay in the oil pump cabinet acts. The chilled water pressure difference switch is disconnected for continuous 10s. The cooling water pressure difference switch is disconnected for continuous 10s. The chilled water outlet temperature or inlet temperature is lower than 3 C for over 10s continuously. In the operating status, the master unit load is less than 10% for over 60s continuously. In the operating status, the master unit load is greater than 110% for over 5s continuously. In the operating status, the master unit load is greater than 115% for over 3s continuously. After the startup cabinet switching signal is sent, the PLC does not detect any switching signal within 30s. After startup is completed, the startup cabinet fault signal is closed or the startup cabinet operating signal is disconnected. After startup is completed, any of the six PTC probes in the motor acts. During operation, the evaporation pressure is smaller than or equal to 238 kpa for continuous 5s. Alarm reported Emergency shutdown Startup terminated Emergency shutdown Alarm reported Shut down normally Emergency shutdown Emergency shutdown Emergency shutdown Emergency shutdown Shut down normally Alarm reported Shut down normally Emergency shutdown Emergency shutdown Emergency shutdown Guide vane opening increase 52

54 restricted Low evaporation pressure Excessively low evaporation pressure Condensing pressure on the high side High condensing pressure Excessively high condensing pressure Pressure ratio protection Guide vane action fault Guide vane opening wire disconnection Master unit current wire disconnection Chilled water inlet temperature wire disconnection Chilled water outlet temperature wire disconnection Cooling water inlet During operation, the evaporation pressure is smaller than or equal to 220 kpa for continuous 3s. During operation, the evaporation pressure is smaller than or equal to 208 kpa for continuous 1s. During operation, the condensing pressure is greater than or equal to 890 kpa for continuous 5s. During operation, the condensing pressure is greater than or equal to 944 kpa for continuous 3s. During operation, the condensing pressure is greater than or equal to 1060 kpa for continuous 1s. The condensing pressure (absolute pressure) is greater than or equal to the evaporation pressure (absolute pressure) x 2.68 for continuous 10s. When the guide vane acts, change in the guide vane opening is smaller than 2% within 20s. The guide vane transducer feedback line is disconnected. The master unit current transducer feedback line is disconnected. The feedback line of chilled water inlet temperature sensor is disconnected. The feedback line of chilled water outlet temperature sensor is disconnected. Shut down normally Emergency shutdown Guide vane opening increase restricted Shut down normally Emergency shutdown Guide vane opening increase restricted Guide vane action prohibited Emergency shutdown Shut down normally Alarm reported Shut down normally temperature wire disconnection The feedback line of cooling water inlet temperature sensor is disconnected. Alarm reported Cooling water outlet temperature wire disconnection Oil tank temperature wire disconnection The feedback line of cooling water outlet temperature sensor is disconnected. The feedback line of oil tank temperature sensor is disconnected. Shut down normally Alarm reported and electric heating of the oil tank prohibited 53

55 Oil supply temperature wire disconnection Maintenance and Operation Instructions for Centrifuge Electric Control Shut down The feedback line of oil supply temperature sensor is disconnected. normally Condensing pressure wire disconnection Evaporation pressure wire disconnection Oil supply pressure wire disconnection Oil tank pressure wire disconnection The condensing pressure transducer feedback line is disconnected. The evaporation pressure transducer feedback line is disconnected. The oil supply pressure transducer feedback line is disconnected. The oil tank pressure transducer feedback line is disconnected. Shut down normally Shut down normally Emergency shutdown Alarm reported and evaporation pressure displayed Remarks: After an alarm is recovered, do remember to press the RESET button on the alarm interface. Attachment 1: Installation and Wiring Requirements and Parameter Settings for Scheneider Inverter Cabinet Configured for Inverter Centrifugal Unit 1 The table below provides the control cable and wiring requirements, which must be strictly followed. Failing to do so may lead to false fault reporting or control failure due to interference. Control signal Cable requirement Grounding requirement Ground terminal Start/stop control Unshielded sheathed wire Grounding not required Unavailable Fault Unshielded sheathed wire Grounding not required Unavailable Operating Unshielded sheathed wire Grounding not required Unavailable Given frequency Shielded cable Grounding Frequency converter end Current feedback Shielded cable Grounding Frequency converter end Communication cable Network cable Unavailable Unavailable 2 Inverter cabinet parameter settings (1) Inverter cabinet parameter settings panel Figure 2 and Figure 3 show the inverter cabinet operation panel and setting interface respectively. The RDY area at the upper left corner on the parameter setting interface is the status display column. In the case of shutdown, the unit can be started only in the RDY 54

56 status; the area of Term is the control status display area, and Term indicates terminal control; HMI indicates the operation panel control. To switch between the two statuses, press F4. 1. Graphic display 2. Function buttons F1, F2, F3 and F4 3. STOP/RESET button 4. RUN button 7. ESC button: used to interrupt a value, parameter or menu and return to the previous selection 6. Button used to rotate the motor reversely 5. Navigation button Press (ENT) Turn CW/ CCW: Save the current value Access the selected menu or parameter Increase or decrease a value Go to the next row or previous row Increase or decrease the given value, if activated through terminal control Figure 2 ATV61 operation display panel Figure 3 ATV61 parameter setting interface 55

57 (2) Inverter cabinet parameter settings Press ESC on the ATV61 operation display panel to access the main menu and set parameters. Set corresponding parameters according to the table below. Main menu: Lower-level menu Main menu 1.1 Simple Startup Upper-level menu 1.2 Monitoring 1.3 Settings 1.4 Motor Control 1.5 Input/Output Settings 1.6 Commands 1.7 Application Functions 1.8 Fault Management 1.9 Communication. Simple Startup menu: Upper-level menu 1.1 Simple Startup Lower-level menu Name Factory Settings User Settings 2/3-wire Control 2-wire Control (2C) 2-wire Macro Configuration Start/Stop (STS) Pump and Fan Standard Motor Frequency 50HZ 50HZ Input Voltage Phase Lack Motor Rated Power Motor Rated Voltage Motor Rated Current Rated Value Confirmation of Frequency Converter Rated Value Confirmation of Frequency Converter Rated Value Confirmation of Frequency Converter Rated Value Confirmation of Frequency Converter Default Rated Output Power of Input Motor 380V Input Master Unit Operating Current Motor Rated Frequency 50HZ 50HZ Motor Rated Speed Rated Value Confirmation of Frequency Converter 2960 Maximum Output Frequency 60HZ 50HZ Change Output Phase Sequence Motor Thermal Current ABC Rated Value Confirmation of Frequency Converter Default Motor Rated Current 1.1 Acceleration Time 3.0S 15-25s 56

58 Deceleration Time 3.0S 5s Low Speed Frequency 0 30HZ High Speed Frequency 50HZ 50HZ Motor Control menu Upper-level menu 1.4 Motor Control Lower-level menu Name Factory Settings User Settings Motor Control Type Energy Saving (nld) Two-point Voltage/Frequency Ratio Input/Output Settings menu Upper-level menu 1.5 Input/Output Settings Lower-level menu Name Factory Settings User Settings LI1 Settings Motor Start/Stop RI Settings Frequency Converter Fault Frequency Converter Fault R2 Settings Frequency Converter Operation Frequency Operation Converter AO1 Settings AI2 Settings See the table below See the table below Given Template Standard Baseband AO1 Settings menu Upper-level menu Lower-level menu AO1 Settings Name Factory Settings User Settings AO1 Allocation Frequency Converter Frequency Frequency Converter Current AO1 Type Current Current AO1 Minimum Output Value AO1 Maximum Output Value 0mA 20mA 4mA 20mA AI2 Settings menu Upper-level menu Lower-level menu AI2 Settings Name Factory Settings User Settings AI2 Allocation Default (Given frequency) AI2 Type Current Current AI2 Minimum Output Value 0mA 4mA AI2 Maximum Output 20mA 20mA 57

59 Value Maintenance and Operation Instructions for Centrifuge Electric Control Commands menu Upper-level menu Lower-level menu 1.6 Commands Name Factory Settings User Settings Given Channel 1 AI1 MODBUS Reverse Prohibited NO YES Combination Mode Combined Channel I/O Mode Application Functions menu Upper-level menu 1.7 Application Functions Lower-level menu Name Factory Settings User Settings Shutdown Type Ramp Shutdown Free Shutdown Communication menu Upper-level menu 1.9 Communication Lower-level menu Name Factory Settings User Settings Network MODBUS See settings in the table below Network MODBUS Upper-level menu Network MODBUS Lower-level menu Name Factory Settings User Settings MODBUS Address OFF 2 MODBUS Format 8-E-1 8-N-2 MODBUS Timeout 10s 15s Note: The set parameters take effect upon restart of the frequency converter. When power is available again after a power failure, connect the power supply after no content is displayed on the frequency converter display interface. 3 Microcomputer cabinet current detection settings In the touch screen parameter settings of the microcomputer cabinet, enter the password to access the parameter setting interface, at the full scale current: 2 rated output current (Ie) of the frequency converter. 4 Common faults and troubleshooting In case of a problem in the frequency conversion control system, first check whether wiring is wrong, whether the cable insulating layer is not stripped, and whether connected cables get loose. If finding any problem in wiring, handle it according to requirements of the table below. 58

60 Fault type Possible fault cause Troubleshooting The microcomputer cabinet sends a frequency change signal during operation, but the frequency converter fails to execute it and always operates at 50 Hz. The unit immediately reports a startup cabinet fault upon startup, but the frequency converter fails to report the fault. The control system has executed the power-off action, but the compressor still keeps operating. The given frequency of microcomputer cabinet is stable, but the inverter cabinet frequency output always fluctuates. After the inverter cabinet operates, its incoming circuit breaker trips. When the unit opens/closes guide vanes, the compressor sends an abnormal sound (the speed fluctuates). The unit does not start, and the inverter cabinet reports a communication fault (SLF1 is displayed at the upper right corner). Transmission of the frequency converter interferes with the given frequency interface. Interference of the faulty channel The frequency converter control mode is deemed to be changed to HMI control during operation. Channel interference The set circuit breaker parameter is a little small. The set deceleration time is too small. Communication is interrupted, and the fault is not reset. Add a signal isolation module on the given frequency channel. Cancel the faulty cable shielding layer. Switch the inverter cabinet control mode to TER. Add a filter capacitor or isolation module. Adjust the circuit breaker protection parameter. Increase the deceleration time to 5s. Disconnect the inverter cabinet from the power supply. Restart the power supply after no content is displayed on its display screen. Attachment 2: Installation and Wiring Requirements and Parameter Settings for Danfoss Inverter Cabinet Configured for Inverter Centrifugal Unit Parameter No. Parameter description Default value Factory settings Remarks 0-01 Language [0] English [10] Chinese 0-02 Speed unit [1] Hz [1] Hz 0-40 LCP manual start button [1] Enable [0] Disable Panel start/stop 0-41 LCP stop button [1] Enable [0] Disable button settings 1-20 Motor power kw Depending on the actual Motor rated parameter Motor rated 59

61 application parameter 1-22 Motor voltage Depending on the actual application 1-23 Motor frequency Depending on the actual application 1-24 Motor current Depending on the actual application 1-25 Motor rated speed Depending on the actual application 1-80 Stop function [0] Inertial stop [0] Inertial stop Stop mode 3-02 Minimum reference value 3-03 Maximum reference value Depending on the actual application Depending on the actual application 30Hz 50 or 60Hz 3-13 Reference value position [0] Linked to manual/automatic [0] Linked to manual/automatic 3-15 Reference value 1 source [1] Analog input end 53 [1] Analog input end Ramp 1 acceleration time Depending on the actual application 20s 5-10 Terminal 18 digital input [8] Start [8] Start 5-40 Relay function Depending on the actual application 6-12 Terminal 53 low current 4.00mA 4.00mA Given analog 6-13 Terminal 53 high current 20.00mA 20.00mA quantity range of frequency 6-50 Terminal 42 output [0] No function [133] Motor current 4-20mA 8-30 Protocol [0] FC [0] Modbus RTU 8-31 Address Depending on the actual application Depending on the actual application 8-32 Baud rate [0] 9600 [3] Parity check/stop bit [0] Even parity check, one stop bit Table 3.4 List of common parameters 60

62 Access parameter settings as follows: Select Main Menu on the operation panel. Maintenance and Operation Instructions for Centrifuge Electric Control The following parameter list is available after Main Menu is accessed: Parameter No. Function Description 0 ** Operation/Display 1 ** Load/Motor 2 ** Braking 3 ** Reference value/acceleration or deceleration 4 ** Limit/alarm 5 ** Digital input/output 6 ** Analog input/output 8 ** Communication and options 9 ** profibus 10 ** CAN field bus 11 ** LonWorks 13 ** Smart logic controller 14 ** Special function 15 ** FC information 16 ** Data reading 18 ** Information and readings 20 ** FC closed loop 21 ** Expansion closed loop 22 ** Application function 23 ** Time base function 24 ** Application function 2 25 ** Multi-pump controller 26 ** Analog input/output option MCB 109 After selecting a different parameter and entering the next directory, enter the corresponding parameter list to complete settings according to the parameter number in Table 3.4. Function Code Function Definition Value Range Set Value F112 Lower limit frequency 0.00Hz F F114 The first acceleration time s 20 F203 Main frequency source (external analog quantity 61

63 AI) F208 Terminal two/three-wire operation control (two-wire type 1) F209 Motor stop mode selection (Free Shutdown) F301 DO1 definition (Frequency converter fault protection) F406 Low limit of AI2 channel input 0.00-F F427 AO2 output range (4-20Ma) F737 Software overcurrent protection (valid) F801 Rated power kW 630 F803 Rated current A 1131 F804 Number of motor poles F805 Rated speed Remarks For F801 to F805, the value needs to be set according to the actual rated parameters of motor. 62

64 MCAC-CTSM GD Midea Heating & Ventilating Equipment Co., Ltd. Is certified under the ISO 9001 International standard for quality assurance. NO GD Midea Heating & Ventilating Equipment Co., Ltd. Is certified under the ISO International standard for environmental management. Certificate No.15912E10020R0L GD Midea Heating & Ventilating Equipment Co., Ltd. Certificate of Occupational Health and Safety Management System Certificate No S20006R0L-1. Commercial Air Conditioner Business Units Midea Group Add: West region of Midea commercial air conditioner department, lndustry Avenue, Beijiao, Shunde, Foshan, Guangdong, P.R. China Postal code: Tel: Fax: Note: The data in this book may be changed without notice for further improvement on quality and performance.