Chapter8 Maintenance And Inspection - Mitsubishi Electric MELSEC QS SERIES User Manual

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MAINTENANCE AND INSPECTION

CHAPTER8 MAINTENANCE AND INSPECTION

In order that you can use the safety programmable controller in normal and optimal
condition at all times, this section describes those items that must be maintained or
inspected daily or at regular intervals.
Do not touch the terminals while power is on.
Doing so could cause shock or erroneous operation.
WARNING
Turn off all phases of the external supply power used in the system
when cleaning the module or retightening the terminal block
mounting screws, terminal screws, or module mounting screws.
Not doing so could result in electric shock.
Tighten a terminal block mounting screw, terminal screw, and
module mounting screw within the specified torque range.
If the terminal block mounting screw or terminal 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 drop of the screw or module, a short circuit or malfunctions.
If the module mounting screw is too loose, it may cause a drop of
the screw or module.
Overtightening the screw may cause a drop due to the damage of
the screw or module.
Do not disassemble or modify the modules.
Doing so could cause trouble, erroneous operation, injury, or fire.
CAUTION
If the product is repaired or remodeled by other than the specified
FA centers or us, the warranty is not covered.
Restrict the mounting/removal of a module, base unit, and terminal
block up to 50 times (IEC61131-2-compliant), after the first use of
the product.
Failure to do so may cause the module to malfunction due to poor
contact of connector.
Since the module case is made of resin, do not drop or apply any
strong impact to the module.
Doing so may damage the module.
Completely turn off the externally supplied power used in the
system before mounting or removing the module to/from the panel.
Not doing so may result in a fault or malfunctions of the module.
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