Wiring; Wiring Precautions - Mitsubishi Electric MELCEC Q Series User Manual

9. LOADING AND INSTALLATION
9.5

Wiring

9.5.1

Wiring precautions

This section describes precautions for wiring the power cable and I/O wires.
WARNING
CAUTION
(1)
Shut off the external power supply for the system in all phases before wiring.
Failure to do so may result in electric shock or damage to the product.
After wiring, attach the included terminal cover to the module before turning it on for
operation.
Failure to do so may result in electric shock.
Ground the FG and LG terminals to the protective ground conductor dedicated to
the programmable controller.
Failure to do so may result in electric shock or malfunction.
Use applicable solderless terminals and tighten them within the specified torque
range. If any spade solderless terminal is used, it may be disconnected when the
terminal screw comes loose, resulting in failure.
Check the rated voltage and terminal layout before wiring to the module, and
connect the cables correctly.
Connecting a power supply with 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.
Connectors for external connection must be crimped or pressed with the tool
specified by the manufacturer, or must be correctly soldered.
Incomplete connections could result in short circuit, fire or malfunction.
Tighten the terminal screw within the specified torque range.
Undertightening can cause short circuit, fire, or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit,
or malfunction.
Prevent foreign matter such as dust or wire chips from entering the module.
Such foreign matter can cause a fire, failure or malfunction.
Mitsubishi programmable controllers must be installed in control panels.
Connect the main power supply to the power supply module in the control panel
through a relay terminal block.
Wiring and replacement of a power supply module must be performed by
maintenance personnel who is familiar with protection against electric shock.
(For the wiring methods, refer to Section 9.5.)
Wiring the power supply
(a) When voltage fluctuates outside the specified value range, connect a constant-
voltage transformer.
Constant
voltage
transformer
Programmable
controller
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