HPS-M -2 DIFFERENTIAL PRESSURE TRANSMITTER. Mounting and operating instructions
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1 DIFFERENTIAL PRESSURE Mounting and operating instructions
2 Table of contents SAFETY AND PRECAUTIONS 3 PRODUCT DESCRIPTION 4 ARTICLE CODES 4 INTENDED AREA OF USE 4 TECHNICAL DATA 4 STANDARDS 5 OPERATIONAL DIAGRAM 5 WIRING AND CONNECTIONS 5 MOUNTING INSTRUCTIONS IN STEPS 6 VERIFICATION OF THE INSTALLATION INSTRUCTIONS 7 OPERATING INSTRUCTIONS 8 MODBUS REGISTER MAPS 10 TRANSPORT AND STORAGE 14 WARRANTY AND RESTRICTIONS 14 MAINTENANCE
3 SAFETY AND PRECAUTIONS Read all the information, the datasheet, mounting and operating instructions and study the wiring and connection diagram before working with the product. For personal and equipment safety, and for optimum product performance, make sure you entirely understand the contents before installing, using, or maintaining this product. For safety and licensing (CE) reasons, unauthorised conversion and / or modifications of the product are inadmissible. The product should not be exposed to abnormal conditions, such as: extreme temperatures, direct sunlight or vibrations. Long-term exposure to chemical vapours in high concentration can affect the product performance. Make sure the work environment is as dry as possible; avoid condensation. All installations shall comply with local health and safety regulations and local electrical standards and approved codes. This product can only be installed by an engineer or a technician who has expert knowledge of the product and safety precautions. Avoid contacts with energised electrical parts. Always disconnect the power supply before connecting, servicing or repairing the product. Always verify that you apply appropriate power supply to the product and use appropriate wire size and characteristics. Make sure that all the screws and nuts are well tightened and fuses (if any) are fitted well. Recycling of equipment and packaging should be taken into consideration and these should be disposed of in accordance with local and national legislation / regulations. In case there are any questions that are not answered, please contact your technical support or consult a professional. 3-14
4 PRODUCT DESCRIPTION The series are high resolution differential pressure transmitters with Modbus RTU communication, which are equipped with a fully digital pressure transducer designed for a wide range of applications. All connections are made via the internal RJ45 connector. Air flow velocity readout is available by connecting an external Pitot tube connection set. All parameters are accessible via Modbus RTU (3S Modbus software or Sensistant). ARTICLE CODES Article code Power supply Connection Range, [Pa] HPS-M-1K VDC RJ Pa HPS-M-2K VDC RJ Pa HPS-M-4K VDC RJ Pa HPS-M-10K VDC RJ Pa INTENDED AREA OF USE TECHNICAL DATA Differential pressure measurement in HVAC applications Air flow volume measurement in HVAC applications Air flow velocity measurement (by using an external PSET-PTX-200 Pitot tube connection set) in HVAC applications Differential pressure / airflow monitoring in clean rooms Clean air and non-aggressive, non-combustible gases Built-in digital high resolution differential pressure sensor RJ45 connector on the PCB Air flow* velocity can be measured via Modbus RTU (by using an external PSET- PTX-200 Pitot tube connection set) Variety of operating ranges and measurement windows Selectable response time: 0,1 10 s Implemented K-factor Differential pressure, air volume* or air velocity readout via Modbus RTU Selectable minimum and maximum operating ranges Modbus registers reset function (to factory pre-set values) Four LEDs with light guides for transmitter status indication Modbus RTU communication Sensor calibration procedure via tact switch Aluminium pressure connection nozzles Four LEDs with light guides for transmitter status indication Accuracy: ±2 % of the operating range Operating ambient conditions: Temperature: C Rel. humidity: < 95 % rh (non-condensing) Storage temperature: C * Only when K-factor of fan / drive is known. If K-factor is unknown, air volume flow can be calculated via multiplying the duct cross-sectional area (A) by the air flow velocity (V) using the formula: Q = A * V 4-14
5 STANDARDS Low Voltage Directive 2014/34/EC EMC Directive 2014/30/EC: EN : 2005/AC:2005, EN :2007/A1:2011/AC:2012, EN :2013 WEEE Directive 2012/19/EC RoHs Directive 2011/65/EC OPERATIONAL DIAGRAM Min. pressure limit Control range min. Control range max. Max. pressure limit Output [%] Out of range LED4 ON Alert LED3 ON LED2 ON Alert LED3 ON Out of range LED4 ON Measured value (pressure, volume flow or air velocity) vs. Output Differential pressure Air volume flow Air velocity WIRING AND CONNECTIONS Power supply 24 VDC GND Ground A Modbus RTU (RS485), signal A /B Modbus RTU (RS485), signal /B Connection RJ45 connector 5-14
6 MOUNTING INSTRUCTIONS IN STEPS Before you start mounting the HPS-M-2 differential pressure transmitter, read carefully Safety and Precautions. Choose a smooth surface for an installation location (a wall, panel, etc.) and follow these steps: 1. Unscrew the front cover of the enclosure to remove it. 2. Fix the enclosure onto the surface by means of suitable fasteners while adhering to the mounting dimensions shown in Fig. 1 Mounting dimensions and the correct mounting position shown in Fig. 2 Mounting position. Fig. 1 Mounting dimensions Fig. 2 Mounting position Correct Incorrect HPS 2x Ø 3, _ HPS 52 + _ HPS + _ 3. Insert the cable though the grommet. 4. Attach an RJ45 connector to the cable (which has already been inserted through the grommet) and connect as shown in Fig. 3 Connections adhering to the information in section Wiring and connections and Fig. 4 Connecting cable. Fig. 3 Connection Fig. 4 Connecting cable RJ45 24 VDC, A, /B, GND 24 VDC 8 mm A /B GND 8 mm 8 mm 8 mm RJ Connect the nozzles with the tubing. 6. Put back the front cover and fix it. 7. Switch on the power supply. For sensor calibration and Modbus register reset procedures, refer to section Operating instructions. 6-14
7 Optional settings To assure correct communication, the NBT needs to be activated in only two devices on the Modbus RTU network. If necessary, enable the NBT resistor via 3SModbus or Sensistant (Holding register 32). Example 1 Example 2 Slave 1 RX RX NBT NBT Slave 2 Master ТX NBT Slave n Master NBT Slave 1 Slave 2 ТX NBT Slave n On a Modbus RTU network, two bus terminators (NBTs) need to be activated. VERIFICATION OF THE INSTALLATION INSTRUCTIONS Continuous green LED1 indication as shown in Fig. 5 Power / Modbus communication indication means the unit is supplied. If LED1 is not on, check the connections again. Blinking green LED1 indication as shown in Fig. 5 Power / Modbus communication indication means the unit has detected a Modbus network. If LED1 does not blink, check the connections again. For more information, click here to refer to the product datasheet - Settings. Fig. 5 Power / Modbus communication indication ATTENTION The status of the LEDs can be checked only when the unit is energised. Take the relevant safety measures! 7-14
8 OPERATING INSTRUCTIONS Calibration procedure: 1. Disconnect the nozzles. 2. There are two options for starting the calibration process: Either write 1 in holding register 40 or press button SW1 for 4 seconds until the green LED2 and yellow LED3 on the printed circuit board blink twice and release it (see Fig. 6 Sensor calibration and Modbus register reset tact switch and indication). 3. After 2 seconds the green LED2 and yellow LED3 will blink twice once again to indicate that the calibration procedure has finished. Fig. 6 Sensor calibration and Modbus register reset tact switch (SW1) and calibration indication Press and hold the button until both LEDs on the PCB blink twice and hold it until both LEDs blink again three times. If the button is released before both LEDs blink again three times, the sensor will have carried out a calibration procedure instead of Modbus registers reset procedure. Modus holding registers reset procedure: 1. Put the jumper onto pins 1 and 2 of the P4 connector for more than 20 s while the device is powered. (See Fig. 7 Modbus holding register reset jumper ). Fig. 7 Modbus holding register reset jumper Modbus communication holding registers from 1 to 3 will be reset to the default values. 3. Remove the jumper. ATTENTION Make sure that the nozzles are free and not connected. 8-14
9 LED indications (See Fig. 8) : 1. When the green LED1 is on, the power supply is adequate and Modbus RTU communication is active. 2. When the green LED2 is on, the measured value (pressure, volume or air velocity) is between the minimum and maximum alert range. 3. When the yellow LED3 is on, the measured value (pressure, volume or air velocity) is below the minimum alert range or above the maximum alert range. 4. When the red LED4 is on, the measured value (pressure, volume or air velocity) is below the minimum measurement range or above the maximum. Fig. 8 LED indications 5. Sensor element failure indication: In case of failure of sensor element or loss of communication with it, the red LED4 blinks. See Fig. 9. Fig. 9 Sensor element error HPS HPS 9-14
10 MODBUS REGISTER MAPS INPUT REGISTERS Data type Description Data Values 1 Output unsigned int. Output value in percentage ,0% 2 Differential pressure unsigned int. Measured differential pressure 3 Volume flow rate high unsigned int. Air Volume flow rate 4 Volume flow rate low unsigned int. HPS-M-1K0-2 HPS-M-2K0-2 HPS-M-4K0-2 HPS-M-10K -2 HPS-M-1K0-2 HPS-M-2K0-2 HPS-M-4K0-2 HPS-M-10K Pa m 3 /h 5 Air velocity unsigned int. Measured air velocity m/s 6 unsigned int. Reserved, returns 0 7 Air pressure/volume/ velocity alert flag unsigned int. The flag indicates that measured data is outside the set alert values. 0 1 Pressure/Volume/Velocity measurement is OK Pressure/Volume/Velocity measurement is too low/high 8 Air pressure/volume/ velocity range limit flag unsigned int. The flag indicates that measured data is outside the set range limit values. 0 1 Pressure/Volume/Velocity range is OK Pressure/Volume/Velocity range is too low/high 9 Sensor fault unsigned int. Indicates sensor failure 0 1 Sensor OK Sensor fault (Red LED4 blinks) 10 unsigned int. Reserved, returns 0 HOLDING REGISTERS Data type Description Data Default Values 1 Device slave address unsigned int. Modbus device address Modbus baud rate unsigned int. Modbus communication baud rate Modbus parity mode unsigned int. Parity check mode 4 Device type unsigned int. Device type (Read-only) 5 HW version unsigned int. 6 FW version unsigned int. Hardware version of the device (Read-only) Firmware version of the device (Read-only) 7-10 Reserved, return 0 2 = HPS-M-1K0-2 = HPS-M-2K0-2 = HPS-M-4K0-2 = HPS-M-10K -2 = 11 Minimum pressure range unsigned int. Minimum of the pressure range 0 - Max. pressure range minus 50 Pa 0 12 Maximum pressure range unsigned int. Maximum of the pressure range 13 Minimum pressure alert unsigned int. 14 Maximum pressure alert unsigned int. Minimum differential pressure alarm value Maximum differential pressure alarm value Min. control range plus 50 Pa HPS-M-1K0-2 HPS-M-2K0-2 HPS-M-4K0-2 HPS-M-10K -2 8N1 8E1 8O Pa Pa Pa Pa 1 2 = 3 = 4 = 5 = 6 = 2 = None Even Odd XXX 0 x 010 HW version 1.00 XXX 0 x 010 FW version Min pressure range max. pressure alarm 0 Max. pressure limit HPS-M-1K0-2 HPS-M-2K0-2 HPS-M-4K0-2 HPS-M-10K ,0 Pa 10 (DPS-M-10K -2) Pa 10 10,0 Pa 10 (DPS-M-10K -2) Pa 15 Minimum volume flow range high unsigned int. 16 Minimum volume flow range Minimum volume flow range value Maximum volume flow range minus 10 m³/h m³/h unsigned int. low Maximum volume flow range high Maximum volume flow range low unsigned int. Maximum volume flow range value unsigned int. 19 Minimum volume flow alert high unsigned int. Minimum volume flow alarm value 20 Minimum volume flow alert low unsigned int. Minimum volume flow range plus 10 m³/h HPS-M-1K0-2 HPS-M-2K0-2 HPS-M-4K0-2 HPS-M-10K -2 Min. volume flow range max. volume flow alarm m³/h m³/h 10-14
11 HOLDING REGISTERS Maximum volume flow alert high Maximum volume flow alert low Data type Description Data Default Values unsigned int. Maximum volume flow alarm value unsigned int. Min. volume flow range max. volume flow range HPS-M-1K0-2 HPS-M-2K0-2 HPS-M-4K0-2 HPS-M-10K m³/h 23 Minimum air velocity range unsigned int. Minimum air velocity range value 0 (Maximum air velocity range minus 1 m/s) ,0 m/s 24 Maximum air velocity range unsigned int. Maximum air velocity range value (Minimum air velocity range plus 1 m/s) ,0 m/s 25 Minimum air velocity alert unsigned int. Minimum air velocity alarm value Min. air velocity range Max. air velocity alarm ,0 m/s 26 Maximum air velocity alert unsigned int. Maximum mum air velocity alarm value 27 Reserved, returns 0 Min. velocity alarm Max. air velocity range ,0 m/s 28 Response time unsigned int. Response time selection ,0 s 29 Power-up timer unsigned int. 30 K-factor. unsigned int. Power-up timer before setting alert and range limit flags. K-factor according to motor / fan specifications 31 Reserved, returns 0 32 Modbus network resistance terminator (NBT) unsigned int. Sets device as an end device on the line s s NBT disconnected NBT connected 33 Altitude unsigned int. Current altitude m 34 Pitot air velocity unsigned int. Enables Air Velocity Readout Duct cross sectional area [ cm 2 ] unsigned int. Calculation of the Volume Flow Rate when K-factor is not known 36 Reserved, returns 0 37 Measurement readout unsigned int. 4-digit measurement indication ON / OFF Operating mode unsigned int. Operating mode selection Reserved, returns 0 40 Recalibrate sensor unsigned int. Sensor recalibration Reserved, return 0 50 Modbus registers reset unsigned int. Reset Modbus Holding Registers to default values For more information about Modbus over serial line, please visit: = 3 = Disabled Enabled Not used 100 cm 2 LED display off LED display on Differential pressure (1) Volume flow rate (2) Air velocity (3) Inactive Active Idle Reset Modbus Registers (1) To measure differential pressure, use use PSET-QF or PSET-PVC set; (2) To measure air flow volume while using PSET-PTx, enter the duct cross sectional area [cm²] in Modbus register 35. To measure air flow volume while using PSET-QF or PSET-PVC, enter the K-factor of the fan in Modbus register 30; (3) To measure air velocity, use PSET-PTx set. INPUT REGISTERS (see Table Input registers above) The input registers are read-only. All data can be read using the Read Input Registers command. Table Input registers shows the returned data type and the way it should be interpreted. Input register 1 contains the value of the output as a percentage of the selected control range. Input register 2 contains the value of the currently measured differential pressure. Input registers 3 and 4 provide information about the current air volume / flow rate. Input register 3 holds the high significant word, while input register 4 holds the low significant word. The value in these registers is equal to the K-factor of the fan (holding register 30) multiplied by square root of the current differential pressure. If K-factor is not known, volume flow rate is calculated via multiplying the duct cross sectional area (holding register 35) by air flow velocity ( i.e. Pitot air velocity enabled by holding register 34). Input register 5 is Air velocity. It is active only when holding register 34 is set to 1. Input register 6 is not used. When addressed, it returns 0. Input register 7 indicates that measured air pressure, volume or velocity is outside the set alert values. It is set to 1 when the measured value is outside the pressure, volume or velocity alert values defined by holding registers 13, 14, 19, 20, 21, 22, 25 and 26. It is not active during the power-up period defined by holding register
12 Input register 8 indicates that measured air pressure, volume or velocity is outside the set range limit values. It is set to 1 when the measured pressure is outside the pressure, volume or velocity limit range values defined by holding registers 11, 12, 15, 16, 17, 18, 23 and 24. It is not active during the power-up period defined by holding register 29. Input register 9 indicates a problem with the sensor. Input register 10 is not used. When addressed, it returns 0. HOLDING REGISTERS (see Table Holding registers above) These registers are read / write registers and they can be managed via Read Holding Registers, Write Single Register and Write Multiple Registers commands. The registers that are not used are read-only and, therefore, writing in these registers neither returns a Modbus error exception, nor makes any changes. Holding register 1 contains the sensor address at which the sensor replies in a Modbus network. The default address is 1. It can be changed in two ways: 1. Send command Write Single Register with address 1 and write the new address value. 2. Connect only your unit to a master controller or a PC application, send the command Write Single Register to address 0 (Modbus broadcast address) and write a new address value. The next two holding registers (2 and 3) also contain Modbus settings. Changing these registers changes the communication settings. The default Modbus settings are as stated in the Modbus Protocol Specification. The next three holding registers (4, 5 and 6) are read-only. They return information about the sensor hardware and firmware versions. The next four holding registers (7, 8, 9 and 10) are not used. They are read-only. Writing in these registers neither returns a Modbus error exception, nor makes any changes! Holding registers 11 determines the minimum pressure range. It cannot be set higher than the maximum pressure range minus the minimum pressure range span (i.e. 50 Pa). The minimum pressure range cannot be higher than the maximum control range minus 50 Pa. Holding register 12 defines the maximum pressure range. It cannot be set lower than the minimum pressure range plus the minimum pressure range span (i.e. 50 Pa). This register accepts values as specified in the Modbus map. (See Table Holding registers above). Writing values other the those specified in the Modbus map does not change anything in this register. The maximum pressure range cannot be less than the minimum range plus 50 Pa. Holding registers 13 and 14 contain the minimum and maximum differential pressure alarm value respectively. Holding registers 15 and 16 hold the minimum volume flow range, which cannot be set higher than the maximum volume flow range minus the minimum volume flow range span (10 m³/h). The air volume flow rate is measured in m 3 /h. Holding register 15 contains the high significant word, while holding register 16 contains 12-14
13 the low significant word of the minimum volume flow rate range. Holding registers 17 and 18 hold the maximum volume flow, which cannot be set lower than the minimum volume flow range plus the minimum volume flow range span (10 m³/h). The air volume flow rate is measured in m 3 /h. Holding register 17 contains the high significant word, while holding register 18 contains the low significant word of the maximum volume flow rate range. Holding registers 19 and 20 hold the minimum volume flow alarm value. The air volume flow rate is measured in m 3 /h. Holding register 19 contains the high significant word, while holding register 20 contains the low significant word of the minimum volume flow rate alert. Holding registers 21 and 22 hold the maximum volume flow alarm value. The air volume flow rate is measured in m 3 /h. Holding register 21 contains the high significant word, while holding register 22 contains the low significant word of the maximum volume flow rate alert. Holding registers 23 and 24 hold the minimum and maximum air velocity range respectively. The minimum air velocity range cannot be set higher than the maximum air velocity range minus minimum air velocity range span (1 m/s). The maximum air velocity range, cannot be set lower than the minimum air velocity range plus the minimum air velocity range span (1 m/s). The minimum value cannot be higher than the maximum value. When a value higher than the defined maximum is written inside a register, it automatically becomes equal to the predefined maximum value. Holding register 25 and 26 hold the minimum and maximum air velocity alarm values respectively. If a value written in a holding register is lower than the predefined minimum value, the unit automatically adjusts the minimum limit to the new maximum limit value. (For example: when min. = 200 and max. = 1.000, if the max. value is changed to 150 (i.e. is lower than the min. value), the unit automatically sets the min. value to 150 because the min. cannot be higher than the max.) Holding register 27 is not used. When addressed, it returns 0. Holding register 27 is not used. When addressed, it returns 0. Holding register 28 contains the response time, which can be given values from 1 to 100, where 1 1,0 second. Holding register 29 contains the value of the Power-up timer before setting the alert and range limit flags. The default value is 60 s. During this interval the alerts and range limits are not compared with the current differential pressure / volume / velocity and alert and range limit flags registers remain 0. You can change the value in this register only within the first 60 s after you have switched on your unit. Holding register 30 holds the K-factor. Enter the K-factor of the used fan / drive, if it is known (check the datasheets of the selected fan / drive). The default value is 0, and you are allowed to write values in the range of Writing values out of this range does not change anything in this register. Holding register 31 is not used. When addressed, it returns 0. Holding register 32 specifies if the device is an end device on the line or not via connecting the NBT. Holding register 33 holds information about the current altitude varying from 0 to The default value is 0, i.e. 0 m. Holding register 34 enables air velocity readout. If the value is 0, air velocity readout is disabled and if the value is 1, air velocity readout is enabled and it is accessible in input register 5. PSET-PTX-200 Pitot tube is necessary
14 Holding register 35 is used for calculation of the volume flow rate when K-factor is not known. This register accepts values from 0 to When the value is 0, it is not used, if in use it takes values from 1 to corresponding to the duct cross sectional area in cm 2. Holding register 36 is not used. When addressed, it returns 0. Holding register 37 is used to define if the LED display will be on or off. Holding registers 38 defines the operating modes, i.e. differential pressure, volume flow rate or air velocity. Holding register 39 is not used. When addressed, it returns 0. Holding register 40 is used for sensor recalibration. Holding registers are not used. When addressed, they return 0. Holding register 50 resets all Modbus Holding registers to their default values. When the process is complete, the value of the register is automatically set to 0 (Idle). TRANSPORT AND STORAGE Avoid shocks and extreme conditions; stock in original packing. WARRANTY AND RESTRICTIONS Two years from the delivery date against defects in manufacturing. Any modifications or alterations to the product after the date of publication relieve the manufacturer of any responsibilities. The manufacturer bears no responsibility for any misprints or mistakes in this data. MAINTENANCE In normal conditions this product is maintenance-free. If soiled, clean with a dry or damp cloth. In case of heavy pollution, clean with a non aggressive product. In these circumstances the unit should be disconnected from the supply. Pay attention that no fluids enter the unit. Only reconnect it to the supply when it is completely dry
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