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Products: RP-C, RP-C-EXT-0-10V-4-PD, RP-C-EXT-BL-2-LV-PD, RP-C-EXT-BL-4-HV-PD, RP-C-EXT-BL-SMI-2-LV-PD, RP-C-EXT-BL-SMI-4-HV-PD, RP-C-EXT-DALI-M-PD, RP-C-EXT-REL-4
Functionalities: Hardware
Product version: 2022, 2023, 2024, 7.0, 7.1
3/16/2026

Grounding and Power for Systems with RP-C 230 V Controller Models and RP Controller Expansion Modules

This section provides grounding and power recommendations for system configurations with the RP-C controller models that support 230 VAC input power and RP controller expansion modules.

For more information, see RP-C Models .

Danger Danger

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

De‑energize all hazardous voltage sources connected to the relay contacts before wiring. More than one disconnect switch may be required to fully de‑energize the equipment before servicing.

Failure to follow these instructions will result in death or serious injury.

System configuration with separate power supplies to RP-C 230 V controller model and RP controller expansion modules with power distribution capability

You can use separate power supplies, with separate fuses (circuit breakers), to power the RP-C 230 V controller model and the RP controller expansion modules to help prevent a problem (such as a short-circuit) with one expansion module from causing the RP-C controller to stop working.

Use the following recommendations to design a good working system:

  • The fuse (circuit breaker) F1 must be rated 3 A or higher (maximum 16 A).

  • The fuse (circuit breaker) F2 must be rated at maximum 16 A.

Note:

To achieve load balancing, the Power Input terminal L (Line) for different RP controller expansion modules can be connected to different phases of the AC mains power supply.

 
action_zoom_plus_stroke System configuration with separate power supplies to RP-C and RP controller expansion modules with power distribution capability, example
Figure: System configuration with separate power supplies to RP-C and RP controller expansion modules with power distribution capability, example
System configuration with a common power supply to RP-C 230 V controller model and RP controller expansion modules with power distribution capability

You can use a common power supply, with a common fuse (circuit breaker), to power the RP-C 230 V controller model and several RP controller expansion modules to reduce the costs of wiring and fuses. However, if there is a problem such as a short-circuit in one of the expansion modules, and the common fuse is blown, the RP-C controller and all expansion modules connected to the same fuse will also stop working. Furthermore, if several RP-C controllers are connected using a daisy chain topology, a problem in one expansion module can in this way cause all controllers downstream from RP-C controller that has stopped working to lose communication to all upstream controllers.

Use the following recommendations to design a good working system:

  • The fuse (circuit breaker) F1 must be rated 3 A or higher (maximum 16 A).

 
action_zoom_plus_stroke System configuration with a common power supply to RP-C and RP controller expansion modules with power distribution capability, example
Figure: System configuration with a common power supply to RP-C and RP controller expansion modules with power distribution capability, example

See Also

  • I/O Wiring
  • Grounding and Power
  • RP-C Models