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5 Installation and Wiring
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
5-4 Wiring
5
5-4-5 Grounding
This section describes how to ground the CPU Rack.
5-4-5 Grounding
When you connect a computer or other peripheral device to a Controller that has a non-isolated
DC power supply, either ground the 0-V side of the external power supply or do not ground it at
all.
If the peripheral devices are grounded incorrectly, the external power supply may be short-cir-
cuited. Never ground the 24-V side of the power supply, as shown in the following figure.
Units with Ground Terminals and Type of Ground Terminals
Internal
power supply
circuit
(Non-isolated)
CPU Unit
Cable
External device
(e.g. computer)
External power supply (Unit power supply)
Non-isolated Option Board,
Communication Interface Unit, etc.
Unit power
supply terminals
Non-isolated DC
power supply
Functional Grounding
Input terminal block
CPU Unit
NX Unit
Functional
Grounding
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