Power Supply; Connection Terminals - Siemens QBM3700 Series User Manual

Consequence

1.4.2 Power supply

1.4.3 Connection terminals

A6V11841988_en--_b
● 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.
The document "Modbus communication" (J3960) provides profound information
on Modbus grounding.
Terminal
24V≂ →,
Diagram
Note Ground is optional.
,24V≂ ←
Power supply AC / DC 24 V
GND
Power supply for external devices AC/DC 24 V
Modbus® communication +
Common
Modbus® communication -
Analog output 1
GND
Analog output 2
Analog input 1
GND
Analog input 2
1
Installation
Wiring
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