Wiring Instructions - Mitsubishi MELSEC Q4ARCPU User Manual

4.3.3 Wiring instructions

Instructions for wiring the power supply cable and I/O cable.
DANGER
CAUTION
(1) Power Supply Connection
(a) When voltage fluctuations are larger than the specified value, connect
a constant-voltage transformer.
Constant
voltage
transformer
Be sure to shut off all phases of the external power supply
used by the system before wiring.
Failure to do so may result in an electric shock or damage of
the product.
Before energizing and operating the system after wiring, be
sure to attach the terminal cover supplied with the product.
Failure to do so may cause an electric shock.
Always ground the FG and LG terminals to the protective
ground conductor.
Failure to do so may cause an electric shock or malfunctions.
Wire the module correctly after confirming the rated voltage
and terminal layout.
Connecting a power supply of a different voltage rating or
incorrect wiring may cause a fire or failure.
Do not connect multiple power supply modules to one
module in parallel. The power supply modules may be
heated, resulting in a fire or failure.
Press, crimp or properly solder the connector for external
connection with the specified tool.
Incomplete connection may cause a short circuit, fire or
malfunctions.
Tighten terminal screws within the specified torque range. If
the screw is too loose, it may cause a short circuit, fire or
malfunctions.
If too tight, it may damage the screw and/or the module,
resulting in a short circuit or malfunctions.
Carefully prevent foreign matter such as dust or wire chips
from entering the module.
Failure to do so may cause a fire, failure or malfunctions.
Install our PLC in a control panel for use.
Wire the main power supply to the power supply module
installed in a control panel through a distribution terminal
block.
Furthermore, the wiring and replacement of a power supply
module have to be performed by a maintenance worker who
acquainted with shock protection.
(For the wiring methods, refer to Q4ARCPU User's Manual.)
PLC
41