User's Manual
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Caution Disconnect the functional earth terminal when performing withstand voltage
tests. Not disconnecting the functional earth terminal may result in burning.
Crimp Connectors
Caution Always use crimp connectors for the CPM1A’s power lines and I/O lines or else
use a solid wire (instead of a stranded wire). Do not connect bare stranded wires
directly to terminals. Bare stranded wires connected directly to the terminal can
cause a fire.
Use M3 terminal screws and tighten the screws securely (0.5 N m).
6.2 mm max. 6.2 mm max.
Fork terminal Ring terminal
The recommended wire size for solid wires is 0.4 to 1.2 mm (AWG26 to AWG18).
3-4-3 Power Supply Wiring
Wire a separate circuit for the CPM1A’s power supply circuit so that there isn’t a
voltage drop from the inrush current that flows when other equipment is turned
on.
When several CPM1A PCs are being used, it is recommended to wire the PCs
on separate circuits to prevent a voltage drop from the inrush current or incorrect
operation of the circuit breaker.
Use twisted power supply wires to prevent noise from the power supply lines.
Adding a 1:1 isolating transformer reduces electrical noise even further.
Considering the possibility of voltage drops and the allowable current, be sure to
use thick power lines.
Isolating
transformer
Breaker
AC
power
supply
Twist the wires. The cross-sectional area
of each wire must be 1.25 mm
2
min.
L1
L2/N
0 CH
00 02
01COM
100 to
240 VAC
Note 1. Before connecting the power supply, make sure that the CPU Unit requires
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 termi-
nals at the bottom of the CPU Unit output 24-VDC power for external de-
vices. The CPU Unit’s internal circuitry will be damaged if AC power is mis-
takenly supplied to a CPU Unit’s power supply output terminals.
Crimp Connectors
Caution Always use crimp connectors for the CPM1A’s power lines. Do not connect bare
stranded wires directly to terminals. Bare stranded wires connected directly to
the terminal can cause a fire.
100- to 240-VAC Power
Supply
Wiring and Connections
Section 3-4