Power Supply Wiring - Omron CPM2A - 11-2005 Manual

Wiring and Connections

3-4-4 Power Supply Wiring

100- to 240-VAC Power
Supply
! Caution
Crimp Terminals
! Caution
56
Wire a separate circuit for the CPM2A'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 CPM2A 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.
AC
Breaker
power
supply
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.
Tighten the terminal block screws of the AC Power Supply to the torque of
0.5 N S m. Loose screws may result in fire or malfunction.
Always use crimp terminals for the CPM2A's power lines. Do not connect bare
stranded wires directly to terminals. Stray wire strands can short-circuit and
cause a fire.
Use M3 crimp terminals and tighten the terminal screws to a torque of 0.5 N S m.
Connect a ring terminal to each terminal screw.
Twist the wires. The cross-sectional area
of each wire must be 1.25 mm
Isolating
transformer
Ring terminal
6.2 mm max.
Section 3-4
2
min.