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8.4
Wiring Inside and Outside the Control Panel
Control panel inside wiring
As shown in the following figure, power lines, including power cables and servo amplifier driving cables, and communication
cables, including network cables, must not be mixed.
Mixing the power lines and communication cables may cause a malfunction due to noise.
When devices that generate surge noise, including a molded case circuit breaker (MCCB), electromagnetic contactor (MC),
relay (RA), solenoid valve, and induction motor, are used, a surge suppressor is effective.
For the surge suppressor, refer to the following.
Page 94 Attaching a Surge Suppressor to Control Equipment
Separately wired power lines and
communication cables
Inside control panel
Power cable
GOT
connection
cable
NFB
PLC I/O wire
MC
MC
RA
RA
Driving
control line
Terminal block
Control panel outside wiring
To lead the power line and the communication cable outside the control panel, open cable holes at two separate places to
lead the cables separately out.
When the cables are led out through the same cable hole for wiring reasons, the cables are more easily affected by noise.
Wiring the power lines and the communication
cables outside the control panel
Power line
Communication
cable
Cable hole
Separate the power line and communication cable each other 100 mm or more in the duct.
When the cables are close each other for wiring reasons, use a separator (made of metal).
Doing so reduces the noise influence.
Wiring of power line and communication cable in the duct
Power line
100 mm or more
Signal
wire
Mixed power lines and
communication cables
Inside control panel
Power cable
NFB
MC
Terminal block
Power line
Communication cable
Wiring duct
Separator
Communication
Power line
cable
GOT
connection
cable
PLC
I/O wire
MC
RA
RA
Driving
control line
8 WIRING OF POWER SUPPLY SECTION
8.4 Wiring Inside and Outside the Control Panel
8
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Troubleshooting
