Control system for rotary heat exchanger EQRB, L=3,4

Transcription

1 Installation instructions, drive system EQRB, L=3.4 sizes General description A speed controlled drive system specifically adapted to drive rotary heat exchangers. No tuning is necessary. All control inputs are galvanically isolated from the mains. The unit is supplied with the motor. The direction of rotation of the motor is reversible. Enclosure class IP54. Safety precautions Sizes Sizes Important! Read through the entire instruction manual carefully before unpacking, installing and using the equipment. The installation must be carried out by authorised personnel. Follow the general measures and regulations for the installation and operation of electrical installations. Follow local measures and regulations to protect against personal injury and mechanical damage. The drive system is intended for permanent installation. Cables must not be connected or disconnected while the power supply is on. Check that the equipment is correctly connected before it is taken into operation. See the instructions under Connection specification, page 2. Faults occurring due to incorrect installation or operation are covered. During operation The unit may not be opened or disassembled during operation. Disassembly and disposal The product is designed to comply with the RoHS directive and must be handled and recycled in accordance with locally applicable legislation. Regarding the control logic and operation: During start up and after each time the AHU has been stopped, it is recommended that the exhaust fan operates during 1 minute before the supply fan is started. Fläkt Woods 9291 GB Specifications are subject to change without prior notice.

2 Connection specification DIP switch ON position OFF position C NO NC 5 9 Speed: 9600 bits: 8 Parity: None Stop bits: 1 (8N1) Preprogrammed: Speed: Bits: 8 Parity: None Stop bits: 1 In the off position the values can be changed by writing to the holding register 4x Address 30 Address 31 The address can be changed between by writing to the holding register 4x No Designation 1 Mains connection 2 Motor phases 3 Hall sensor 4 Modbus, Defrosting, Cooling recovery, Control signal 5 Alarm output 6 DIP switches 7 Test button 8 LED Indication Mains The power supply is connected on terminal block P1 N, L, PE, 230VAC +-15% 50/60Hz. The drive system shall always be preceded by an external fuse 10AT. Current Rated current 1.0A. Motor The motor is connected on terminal blocks P6 and P7. The motor has been customised and cannot be replaced with a similar one. Functional description Cleaning mode When there is no control signal the heat exchanger rotates 30 every 5 minutes. Communication The drive unit has built-in Modbus RTU communication via RS485, terminal block P3 terminals 1 (A+), 2 (B-) and 3 (ref.). The preset parameters for communication are: Address: 30 Baud rate/speed: 9600 Parity bit: N, none Stop bit: 1 Data bits: 8 For a complete Modbus register see Appendix 1: Communication can be used for all drive system functions. Defrosting It is possible to connect a differential thermostat or pressure monitor to control defrosting on terminal block P3 terminals 4 and 5. When the contact is closed the speed is reduced to 2 rpm. Cooling recovery When terminals 6 and 7 on terminal block P3 are closed the rotor goes into cooling recovery mode and the speed increases and remains constant at 25 rpm, irrespective of control signal. Rotation sensor The drive system has a built-in rotation sensor that detects whether the belt has snapped. Belt testing takes place at set time intervals depending on the current speed. Control signal The control signal is connected on terminal block P3 terminals 8 and 9. The control system can handle several different input signals: 0-10VDC 2-10VDC 0-20mA 4-20mA Modbus RTU The choice of control signal is made using dip switches 11 and 12 corresponding to level and type respectively. The motor speed follows a predetermined linearisation function proportional to the degree of efficiency of the rotor. Fläkt Woods 9291 GB Specifications are subject to change without prior notice.

3 Run indicator The drive system indicates, via LEDs, the speed and operating status of the unit at any point. See table. Alarm relay Relay output max. 5A, 250VAC. The contact switches in the event of an alarm. Green Red Indication Alarm relay Steady illumination Flashes in proportion to the speed of the motor. Extinguished Voltage without rotation Speed x 0.5Hz No voltage Extinguished No alarm Switches 2 flashes Snapped belt Switches 3 flashes Motor locked/ blocked 3 flashes Timeout target speed 4 flashes High/Low voltage 5 flashes Motor sensor fault 5 flashes Cooling recovery and defrosting at the same time 5 flashes High temp. 5 flashes All DIP switches in the ON position Switches Switches Switches Alarm Alarm output Description Info Snapped belt Yes If the belt snaps or the rotor stops the relay switches. Voltage fault Yes If the supply voltage is too high or too low the relay switches and the rotor stops. Overload fault Yes If the motor is overloaded the relay switches and the rotor stops. Short-circuit Yes If there is a short-circuit in the motor the relay switches. Reversible Reversible Reversible Permanent Fault codes Alarm Fault codes Low voltage 1 High voltage 2 Snapped belt 4 Motor locked/blocked 8 Motor sensor fault 16 Cooling recovery/defrosting 32 High temperature 64 DIP switch fault 128 AWD 256 Target speed timeout 512 Fläkt Woods 9291 GB Specifications are subject to change without prior notice.

4 DIP switch settings + + The gear ratio is set at the factory. The correct activation of the drive system requires that DIP switches 2-7 be set according to the Binary Coded Decimal (BCD) coding of the ratio between the rotor and belt pulley. Switch Value Function 1 1 Anti-clockwise 0 0 Clockwise Not set/fault Programmable reg. 0x Decimal value for gearing 1 Large motor 0 Small motor N1 0 Std. Reg. 0x0035-0x0037 (Std N1) 1 Addr: 30 0 Std. Reg. 0x0034 (Std. Addr: 31) V/ 0-20mA V / 4-20mA 1 Control signal voltage 0 Control signal current For example. Rotor diameter 1000 mm, belt pulley diameter 38 mm and belt diameter 8 mm, gives ratio of /38+8=22 and the BCD coding is as follows DIP switch Rotor direction of rotation Supply air Corresponding value Position 2 1 OFF ON ON OFF 0 Supply air Value 6 16 ON OFF 0 Total The direction of rotation is changed by changing dip switch 1 and is executed by switching on the power. Fläkt Woods 9291 GB Specifications are subject to change without prior notice.

5 Troubleshooting Check that the installation has been carried out correctly. For example, that the cables are properly connected to the correct terminal block and that the dip switches are set correctly. Observation/ Fault cause/action: indication No LED lit. Check that there is 230VAC ±10% on the mains terminal block. If the mains voltage is correct replace the control unit. The green LED is flashing slowly/ cleaning mode signal - low control signal The motor is not turning despite a control signal. The rotation sensor is generating an alarm despite the belt being intact. Check that the cables are correctly connected. Check the DIP switch. Vary the control signal between minimum and maximum 0-10 V (2-10 V). Check by strapping P3 6 and 7, the motor should now speed up to its maximum speed. Gearing incorrect. Check DIP switch 2-7. Contact Fläkt Woods. Observation/ indication twice. three times. four times. five times. The rotation sensor is not generating an alarm despite the belt having snapped. The motor is rotating in the wrong direction. The motor runs at full speed even when the control signal is low. Fault cause/action: Indicates a snapped belt. Check that the rotor is no stiffer than normal, or whether the belt has snapped. The ramp time to the desired speed is too long. Check that the rotor is no stiffer than normal, or locked. Check the mains voltage. Sensor problem. Check the DIP switch. Check that cooling recovery and defrosting are not taking place at the same time Contact Fläkt Woods. Switch off the power and change DIP switch 1. Then switch the power on again. Check that the cooling recovery terminal block is not strapped (6 and 7), or Modbus register 4x0029 is set to 1. If necessary the entire control unit must be replaced including the bracket and motor. Fläkt Woods 9291 GB Specifications are subject to change without prior notice.

6 Table 1 Register Name Description Comment Type Min Max Default 3 x 0001 MbusVer Protocol version Read Unsigned x 0002 HW Hardware version Read Unsigned x 0003 SW Software version Read Unsigned x 0004 Nrot Total number of revolutions that the rotor has rotated since installation 3 x 0005 Nrem Total number of alarms for drive belt faults 3 x 0006 Nlocked Total number of alarms for motor faults 3 x 0007 Nsp Total number of alarms for voltage faults 3 x 0008 Ngiv Total number of alarms for sensor faults 3 x 0009 M1 Motor size Read Unsigned x 0010 n1 Size of the drive pulley on the motor Read According to DIP switch Unsigned x 0012 n Current motor speed Read (RPM) Signed x 0013 n3 Current calculated speed of the rotor Read Motor speed/gearing (RPM) Signed x 0014 Switch DIP switch Read DIP 1-11 whole number value Unsigned x 0015 Mode Current operating mode Read 0 = Initiation 1 = Heating 2 = Cooling 3 = Purging 4 = Defrosting 5 = Test button 6 = Belt test 7 = Standstill 8 = Configuration 9 = Fault 10 = Stop 11 = Motor test Unsigned x 0016 Signal Read off control signal Read Read off value as a % Unsigned x 0017 Current Average current Read Filter 5ms Unsigned x 0018 Belt_timer1 Countdown before belt test 1 in seconds 3 x 0019 Belt_timer2 Countdown before belt test 2 in seconds 3 x 0020 Purge timer Countdown before purging (seconds) 3 x 0021 Rot_count_msb Total number of revolutions that the rotor has rotated since installation (most significant bits) 3 x 0022 Rot_count_lsb Total number of revolutions that the rotor has rotated since installation (least significant bits) 3 x 0023 Ramp timeout 5 minute countdown to the rotation alarm delay Read Test taking place in 0 seconds Unsigned Read Test taking place in 0 seconds Unsigned Read Purging taking place in 0 seconds Read Revolutions = 3x0021 * x0022 Read Revolutions = 3x0021 * x0022 Unsigned Unsigned Unsigned Read Value in seconds Unsigned x 0024 Drive_temp Electronics temperature Read Degrees Celsius Unsigned x 0025 Smps_temp Processor temperature Read Degrees Celsius Unsigned Fläkt Woods 9291 GB Specifications are subject to change without prior notice.

7 Table 2 Register Name Description write Comment Min Max Default 4 x 0001 Setup Request to go into setup mode/leave setup mode. And write to E2. The motor will be switched off in this mode. 0. Exit SetupMode 1. Enter SetupMode 2. param to E2 Unsigned x 0002 Dir Direction of rotation of the motor 0 = DIP value, 1= inverted direction to the DIP switch Unsigned x 0007 Larm Reads out the applicable alarm code/reset of the applicable alarm code 0 = Alarm reset 0 x 0001 Low voltage 0 x 0002 High voltage 0 x 0004 Snapped belt 0 x 0008 Motor blocked 0 x 0010 Sensor fault 0 x 0020 Cooling recovery and defrosting 0 x 0040 High temperature 0 x 0080 DIP switch fault 0 x 0100 AWD 0 x 0200 Target speed If several faults occur at the same they are added together Unsigned x 0008 Nd Dead band in the speed signal (resolution 0.01 rpm) Unsigned x 0029 Heat/cool Heat recovery max. 20 rpm cooling recovery max. 25 rpm Heating/cooling. Reads/writes the applicable operational case Not saved in the event of a power outage Unsigned x 0030 Test Activate test mode 4 x 0031 Relation The ratio between the rotor and pulley diameter 4 x 0033 Ctrl Control signal 4 x 0034 Adress Modbus address 4 x 0035 Baud Data speed/100 4 x 0036 Par Parity (0=N, 1=E, 2=O) 4 x 0037 Stop Number of stop bits 4 x 0038 Rst Factory reset 4 x 0039 Defrost Activate defrosting 4 x 0040 Purge time Purging time interval 4x0043 belt test 1 time 4x0044 belt test 2 time Time interval before belt test 1 in minutes Time interval before belt test 2 in minutes 1= test mode, 0 = Normal operation Gearing ratio in the event of DIP=62. Not saved in the event of a power outage Unsigned Unsigned Unsigned Activated through the DIP switch. Not saved in the event of a power outage Activated through the DIP switch. Not saved in the event of a power outage Unsigned Unsigned Unsigned Unsigned = Reset Unsigned = Activate Unsigned Min Unsigned Not saved Unsigned Not saved Unsigned Fläkt Woods 9291 GB Specifications are subject to change without prior notice.