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35
Grounding Be sure to ground the functional earth and protective earth terminals together to
less than 100 Ω in order to protect against electric shock and incorrect operation
from electrical noise. Be sure to use a wire of at least 1.25 mm
2
for grounding.
Caution When installing the Units, always connect to a class-3 (to 100 Ω or less) ground.
Otherwise, an electric shock may occur.
Ground to 100 Ω max.
Note Disconnect the functional earth terminal when performing withstand voltage
tests.
Crimp Connectors Always use crimp connectors for the CPM1’s power lines and I/O lines or else
use a single-wire line (instead of a stranded wire). Stray wire strands could acci-
dentally short out.
Use M3 terminal screws and tighten the screws securely (0.5 N m).
Recommended Terminal: Use the terminal shown below. Round terminals can-
not be used.
6.2 mm max.
Fork terminal
3-4-2 Power Supply Wiring
100 to 240 VAC Power Supply Wire a separate circuit for the CPM1’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 CPM1 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.
Isolating
transformer
Breaker
AC
power
supply
Twist the wires. The cross-sectional area
of each wire must be 1.25 mm
2
min.
Caution Tighten the terminal block screws of the AC Power Supply to the torque of
0.5 N m. Loose screws may result in burning or malfunction.
Wiring and Connections
Section 3-4
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