Mitsubishi Electric MELSEC Q Series User Manual page 8

[Wiring Precautions]
● Tightening torque for the connector mounting screws should be in the specified range.
Undertightening the screws can cause short circuit, fire or malfunction. Overtightening can damage
the screw and/or module, resulting in drop, short circuit, fire or malfunction.
● Securely install connectors to the module. Improper installation can cause malfunction.
● When disconnecting a cable from the module, do not hold and pull the cable part.For a cable with
connector, hold the connected connector by hand to disconnect the cable. For terminal block cables,
loosen the terminal block terminal screws first. Pulling the cable while being connected to the module
will result in malfunction or damage to the module or the cable.
● Check the type of interface to connect in advance in order to properly connect cables. Connection or
wiring to wrong interface can cause a failure of the module and external device.
● Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can
cause a fire, failure, or malfunction.
● To prevent foreign matters such as wire chips from entering into the module during wiring, a sealing
label is attached to the top of the module. During wiring, do not remove this label. During system
operation, be sure to remove this label to release the heat.
● Use the C Controller module as being installed in the control panel. Let the main power wiring
through the relay terminal block to the PLC power supply unit installed in the control panel. Further,
replacement and wiring of the power supply module must be performed by maintenance personnel
fully trained for electric shock protection. For wiring procedures, refer to the QCPU User's Manual
(Hardware Design, Maintenance and Inspection).
[Startup and Maintenance Precautions]
● Do not touch any terminal while power is on. Doing so will cause electric shock.
● Correctly connect the battery connector. Do not charge, disassemble, heat, short-circuit, solder, or
throw the battery into the fire. Doing so will cause the battery to produce heat, explode, or ignite,
resulting in injury and fire.
● Shut off the external power supply for the system in all phases before cleaning the module or
retightening the terminal screws or module fixing screws. Failure to do so may result in electric
shock, module failure or malfunction. Undertightening the terminal screws can cause resulting in
drop, short circuit or malfunction. Overtightening can damage the screw and/or module, resulting in
drop, short circuit, or malfunction.
6
CAUTION
WARNING