4-27
4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
4-4 Wiring
4
4-4-1 Power Supply Wiring
AC Power Source
• Supply 100 to 240 VAC.
• Keep voltage fluctuations within the specified range:
• If one power supply phase of the equipment is grounded, connect the grounded phase side to the
L2/N terminal.
Isolation Transformer
The Controller's internal noise isolation circuits are sufficient to control typical noise in power supply
lines. Noise between the Controller and ground can be significantly reduced by connecting a 1- to-1
isolation transformer. Do not ground the secondary coil of the transformer.
Power Supply Capacity
The power consumption will be 120 VA maximum. per Rack for the NJ-PA3001. When you select
the power supply, consider that surge current will flow when the power is turned ON. Refer to 3-3-1
Models and Specifications for information on surge current specifications.
RUN Output
This output is ON when the CPU Unit is operating; it is OFF when the CPU Unit is in PROGRAM
mode or a Controller error in the major fault level occurs.
The RUN output can be used to control external systems, such as in an emergency stop circuit that
turns OFF the power supply to external systems when the CPU Unit is not operating. (Refer to 4-2
Fail-safe Circuits for more information.)
Supply voltage Allowable voltage fluctuations
100 to 240 VAC 85 to 264 VAC
Item NJ-PA3001
Contact form SPST-NO
Maximum switching
capacity
240 VAC: 2 A for resistive loads
120 VAC: 0.5 A for inductive loads
24 VDC: 2 A for resistive loads
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