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Siemens QBM3700 Series User Manual

Modbus air pressure sensor with i/o extension
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Modbus Air Pressure Sensor with I/O extension
QBM3700..
User Guide
A6V11841988_en--_b
Smart Infrastructure
2021-02-24

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  Summary of Contents for Siemens QBM3700 Series

  • Page 1 Modbus Air Pressure Sensor with I/O extension QBM3700.. User Guide A6V11841988_en--_b Smart Infrastructure 2021-02-24...
  • Page 2: Table Of Contents

    Contents Legal note ......................3 Safety notes in the data sheet ................3 Installation ....................4 Mounting .....................4 Quick release fasteners and detached cover ..........5 Connecting tubes ..................6 Wiring ......................6 1.4.1 Electrical grounding ..............6 1.4.2 Power supply ................7 1.4.3 Connection terminals ..............7 1.4.4 Signal wiring .................8 Commissioning ..................
  • Page 3: Legal Note

    Legal note Safety notes in the data sheet Legal note Legal note concept This guide includes notes that must be followed for your own personal safety as well as to prevent damage to property. Notes dealing only with damage to property do not have the warning triangle and use the signal word NOTICE and an exclamation point.
  • Page 4: Installation

    Installation Mounting 1 Installation 1.1 Mounting NOTICE Hint Mount the sensor in a location that is easy to open the cover and access the terminals, DIP switches and view the LEDs. Proceed as follows to mount the sensor to a surface: ●...
  • Page 5: Quick Release Fasteners And Detached Cover

    Installation Quick release fasteners and detached cover 1.2 Quick release fasteners and detached cover ● Open the housing with the quick release fasteners ● The cover is easy to remove 90° A6V11841988_en--_b 5 | 20...
  • Page 6: Connecting Tubes

    Installation Connecting tubes 1.3 Connecting tubes Connect the tubes Avoid loops 1.4 Wiring 1.4.1 Electrical grounding Starting point Note the following grounding situation of the QBM3700... REF B- A+ Power- supply Not isolated RS485 Sensor module Transformer Earth 6 | 20 A6V11841988_en--_b...
  • Page 7: Power Supply

    Installation Wiring Consequence ● QBM3700.. uses a non-isolated RS485-Interface. ● The reference of RS485 transceiver is connected to GND. ● All GND pins are on the same potential. ● If the Climatix controller and QBM3700.. are connected to the same power source, take care to avoid incorrect wiring between 24 V input and GND.
  • Page 8: Signal Wiring

    Installation Wiring 1.4.4 Signal wiring The following graphics illustrate all signal types of a QBM3700... 1.4.4.1 Analog inputs Analog inputs for passive sensors Application Connecting passive temperature sensors. Signal types: Pt1000, LG-Ni1000, NTC10k, and Ni1000 Terminal AI1, AI2 Diagram Analog inputs for voltage signal Application Connecting devices that supply a 0…10 V signal Terminal...
  • Page 9 Installation Wiring 1.4.4.2 Analog outputs Analog outputs with voltage signal Application Connecting devices that are controlled with a 0...10 V signal Terminal AO1, AO2 Diagram A6V11841988_en--_b 9 | 20...
  • Page 10: Commissioning

    Commissioning Address 2 Commissioning 2.1 Address 2.1.1 DIP switches (Climatix and other controllers) Use DIP switches to adjust the Modbus address and for termination. ● The DIP-switches have priority over register 4x0764 (Modbus address). ● The Modbus address (register 4x0764) is valid as soon as all DIP switches are on '0'.
  • Page 11: Baud Rate

    Commissioning Fault detection, correction or reset 1. Press and hold the push button for 5...10 seconds. 2. As soon the button is released the status LED lights up orange.  The QBM3700.. temporarily receives address 246 to connect.  The baud rate is automatically recognized. ...
  • Page 12 Commissioning Fault detection, correction or reset Value Error code Reliability pressure Reliability analog Value sensor (register inputs (register (register 4x0002) 4x0004 + 4x0006) 4x0008 + 4x0010) Calculation error Extended error EEPROM protection active Configuration error Configuration error Configuration error LED status indication Color Status Function...
  • Page 13: Engineering

    Engineering Implementing volume flow measurement 3 Engineering 3.1 Implementing volume flow measurement Implementing volume flow measurement In addition to normal (differential) pressure measurement, the QBM3700.. provides volume flow measurement (i.e. used with 3rd party controllers). Flow is a volume over time. It is related to differential pressure according to the following formula: Flow measurement with QBM3700..
  • Page 14 Engineering Modbus registers Addr. Description Unit Scaling R/W Area Data type 4x0001 Type 9705 = 1x 500 Pa uint16_t 9710 = 1x 1250 Pa 9720 = 1x 2500 Pa 4x0002 Error code uint16_t 4x0003 Analog output coupling R/W 0 = Analog output coupled with differential uint16_t pressure sensors = default 1 = Analog output coupled as defined in...
  • Page 15 Engineering Modbus registers Differential pressure 1 Addr. Description Unit Scaling R/W Area Data type 4x0035 Reliability. uint16_t 4x0036 Value uint16_t 4x0037 Unit R/W 0 = Pa = (Default) uint16_t 1 = PSI 2 = mmHG 3 = mmH2O 4x0038 Value [Pa] uint16_t 4x0039 Value [PSI]...
  • Page 16 Engineering Modbus registers Differential pressure 2 Addr. Description Unit Scaling R/W Area Data type 4x0065 Reliability. uint16_t 4x0066 Value uint16_t 4x0067 Unit R/W 0 = Pa = Default uint16_t 1 = PSI 2 = mmHG 3 = mmH2O 4x0068 Value [Pa] uint16_t 4x0069 Value [PSI]...
  • Page 17 Engineering Modbus registers Modbus Settings (as per Climatix) Addr. Description Unit Scaling R/W Area Data type 4x0764 Modbus addressing R/W 1 ≤ VAL ≤ 247 uint16_t 255 = Default 4x0765 Baud rate R/W 0 = Auto (Default) uint16_t 1 = 9600 2 = 19200 3 = 38400 4 = 57600...
  • Page 18: Maintenance

    Maintenance Fused mode analog outputs 4 Maintenance 4.1 Fused mode analog outputs QBM37.. Are supplied with a fused mode. This prevents damage caused by an interruption in Modbus communications. The analog outputs are switched to DC 0 V for interruptions to communications >60 seconds.
  • Page 19: Supplemental Information

    Supplemental information 5 Supplemental information Document title Topic Document no: Datasheet: Modbus air pressure sensor with I/O Functions, use, technical data, terminals, A6V11684000 extension: QBM3700.. dimensions and Modbus registers Mounting instructions: Differential Pressure Mounting / installation A6V11697501 Sensors QBM3700.. A6V11841988_en--_b 19 | 20...
  • Page 20 Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2019 Technical specifications and availability subject to change without notice. A6V11841988_en--_b...