Actuator Wiring (Modbus Rtu) - Siemens OpenAir GBB Series Technical Basics

Note
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6.4

Actuator wiring (Modbus RTU)

The damper actuators are supplied with a prewired connecting and communication
cable. All interconnected devices must be connected to the same G0.
Strand code Strand color
1 red (RD)
2 black (BK)
6 violet (VT)
8 grey (GY)
9 pink (PK)
The operating voltage at terminals G and G0 must comply with the requirements under
SELV or PELV.
Safety transformers with twofold insulation as per EN 61558 required; they must be
designed to be on 100 % of the time.
Rotary actuators without spring return GBB/GIB..1
Wiring notes
Terminal code Description
G System potential AC 24 V
G0 System neutral AC 24 V
REF Reference (Modbus RTU)
+ Bus + (Modbus RTU)
- Bus - (Modbus RTU)
CE1Z4626en
2019-11-28