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Wiring CP1H CPU Units Section 3-4
3-4-1 Wiring Power Supply and Ground Lines
CPU Units with AC Power Supply
Wiring the AC Power Supply and Ground Lines
• Wire a separate circuit for the power supply circuit so that there is no volt-
age drop from the inrush current that flows when other equipment is
turned ON.
• When several CP1H PLCs are being used, it is recommended to wire the
PLCs on separate circuits to prevent a voltage drop from the inrush cur-
rent or incorrect operation of the circuit breaker.
• Use twisted-pair power supply cables to prevent noise from the power
supply lines. Adding a 1:1 isolating transformer reduces electrical noise
even further.
• Consider the possibility of voltage drops and the allowable current, and
always use thick power lines.
• Use round crimp terminals for AC power supply wiring.
• AC Power Supply
Provide a power supply of 100 to 240 VAC.
• Use a power supply within the following voltage fluctuation range.
Note (1) Before connecting the power supply, make sure that the CPU Unit re-
quires an AC power supply and not a DC power supply. The CPU Unit's
internal circuitry will be damaged if AC power is mistakenly supplied to a
CPU Unit that requires a DC power supply.
(2) The power supply input terminals are at the top of the CPU Unit; the ter-
minals at the bottom of the CPU Unit output 24-VDC power for external
devices. The CPU Unit's internal circuitry will be damaged if AC power is
mistakenly supplied to a CPU Unit's power supply output terminals.
!Caution Tighten the terminal block screws for the AC power supply to the torque of
0.5 N·m. Loose screws may result in fire or malfunction.
• Always ground the ground terminal to 100 Ω or less to protect against
electric shock and incorrect operation from electrical noise.
MCCB
S
R
L1 L2/N COM 01 03 05 07 09 11 01 03 05 07 09 11
00 02 04 06 08 10 00 02 04 06 08 10
100 to 240 VAC at 50/60 Hz
Upper terminal block
Ground (100 Ω or less)
GR: Protective ground terminalLG: Functional ground terminal
Power supply voltage Allowable voltage fluctuation range
100 to 240 VAC 85 to 264 VAC
6.2 mm max.
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