Concept
Grounding and Power for Systems with RP-C-16A and Expansion Modules
This section provides grounding and power recommendations for system configurations with an RP-C controller and RP Series expansion modules.
Danger
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HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH De-energize the high-voltage relay contacts before wiring. More than one disconnect switch may be required to de-energize the equipment before servicing. Failure to follow these instructions will result in death or serious injury. |
You can use separate power supplies, with separate fuses (circuit breakers), to power the RP-C-16A controller and the RP Series 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.
To achieve load balancing, the Power Input terminal L (Line) for different RP Series expansion modules can be connected to different phases of the AC mains power supply.
You can use a common power supply, with a common fuse (circuit breaker), to power the RP-C-16A controller and several RP Series 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).
I/O Wiring
Grounding and Power