Siemens QBM97 Series User manual

Modbus air pressure sensor with I/O extension

QBM97..

User Guide

A6V11478123_en_a

Building Technologies

2019

-02-01

Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

| 22

Contents

Legal note .............................................................................................................3

Safety notes in the data sheet ...................................................................................3

1 Installation ...................................................................................................4

1.1 Mounting..........................................................................................................4

1.1.1 Dimensions ......................................................................................5

1.2 Quick release fasteners and detached cover..................................................6

1.3 Connecting tubes ............................................................................................7

1.4 Wiring ..............................................................................................................8

1.4.1 Electrical grounding .........................................................................8

1.4.2 Power supply ...................................................................................9

1.4.3 Signal wiring...................................................................................10

2 Commissioning..........................................................................................12

2.1 Addressing ....................................................................................................12

2.1.1 DIP switches (Climatix and other controllers)................................12

2.1.2 On-event addressing (Climatix controllers)....................................13

2.1.3 Baud rate .......................................................................................13

2.2 Fault detection, correction or reset................................................................14

3 Engineering ...............................................................................................15

3.1 Implementing volume flow measurement......................................................15

3.2 Modbus registers...........................................................................................16

4 Maintenance..............................................................................................20

4.1 Zero reset ......................................................................................................20

5 Additional information ................................................................................21

Legal note

Safety notes in the data sheet

3 |

Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

Legal note

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.

The notes are depicted as follows:

NOTICE

Type and source of hazard

Consequences in the event the hazard occurs

●Measures/prohibitions to prevent the hazard

Only qualified personnel may commission the device/system. In this regard,

qualified personnel have the training and experience necessary to recognize and

avoid risks when working with this device/system.

The device/system described here may only be used in building technical plants

and for the described applications only.

The trouble-free and safe operation of the device/system described here requires

proper transportation, correct warehousing, mounting, installation, commissioning,

operation, and maintenance.

You must comply with permissible ambient conditions. You must comply with the

information provided in the Section "Technical data" and any notes in the

associated documentation.

Fuses, switches, wiring and grounding must comply with local safety regulations for

electrical installations. Observe all local and currently valid laws and regulations.

The content of this document was reviewed to ensure it matches the hardware and

firmware described herein. Deviations cannot be precluded, however, so that we

cannot guarantee that the document matches in full the actual device/system. The

information provided in this document is reviewed on a regular basis and any

required corrections are added to the next edition.

Safety notes in the data sheet

NOTICE

Comply with all safety notes in data sheet A6V11478118 in the sections

"Technical data" and "Notes".

Legal note concept

Qualified personnel

Proper use

Exemption from liability

Installation

Mounting

| 22

Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1Installation

1.1 Mounting

NOTICE

Tip

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:

●Screw the sensor at the 2 brackets (on the device sides) to the mounting

surface.

●Keep the following guidelines

All measurements in millimeters

134

5.5

min. 75

Installation

Mounting

5 |

Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1.1.1 Dimensions

QBM97.. (all dimensions in mm)

Front view QBM97.. (here: without M12) Side view QBM97.. (here: without M12)

Bottom view QBM97.. (opened cover) AQB9120/101A and AQB9220/101A

81.9

35.5

5.5

146

134

11.3

910

151.4

175

3.4

6.5

78.5

100

1 - 4

Installation

Quick release fasteners and detached cover

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Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1.2 Quick release fasteners and detached cover

●Open the housing with the quick release fasteners

●The cover can easily be detached completely

90°

Installation

Connecting tubes

7 |

Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1.3 Connecting tubes

Connect the tubes Avoid loops

Installation

Wiring

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Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1.4 Wiring

1.4.1 Electrical grounding

Note the following grounding situation of the QBM97.

●QBM97 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 QBM97 are connected to the same power source,

take care to avoid miswiring between 24 V input and GND

The document "Modbus communication" (J3960) provides profound information

on Modbus grounding.

Transformer

Power-

supply

24V

≂

REF B-A+

Earth

Sensor module

Not isolated RS485

Situation

Consequences

Installation

Wiring

9 |

Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1.4.2 Power supply

Terminal 24V≂ →, ,24V≂ ←

Diagram

Note Earth is optional.

24V

Installation

Wiring

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Siemens

A6V11478123_en_a

Building Technologies

2019-02-01

1.4.3 Signal wiring

The following graphics illustrate all signal types of a QBM97.

1.4.3.1 Analog inputs

Analog inputs for passive sensors

Use Connecting passive temperature sensors.

Signal types: Pt1000, LG-Ni1000, NTC10k and Ni1000

Terminal AI1, AI2

Diagram

Analog inputs for voltage signal

Use Connecting devices that supply a 0…10 V signal

Terminal AI1, AI2

Diagram

AI1

AI2

AI1

AI2

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