Mitsubishi Electric 800 Series Instruction Manual page 598

7.1.3 Daily and periodic inspection
Area of Inspection item
inspection
General Surrounding environment
Overall unit
Power supply voltage
Main circuit General
Conductors, cables
Transformer/
reactor
Terminal block
Smoothing aluminum
electrolytic capacitor
Relay/contactor
Control Operation check
circuit,
protective
circuit
Components Overall
check
Aluminum
electrolytic
capacitor
Cooling Cooling fan
system
Heat sink
Description
Check the surrounding air temperature,
humidity, dirt, corrosive gas, oil mist, etc.
Check for unusual vibration and noise.
Check for dirt, oil, and other foreign
*1
material.
Check that the main circuit voltages and
*2
control voltages are normal.
Check with megger (across main circuit
terminals and earth (ground) terminal).
Check for loose screws and bolts.
Check for overheat traces on the parts.
Check for stain.
Check conductors for distortion.
Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
Check for unusual odor and abnormal
increase of whining sound.
Check for a damage.
Check for liquid leakage.
Check for safety valve projection and bulge.
Visual check and judge by the life check of
the main circuit capacitor. (Refer to
600.)
Check that the operation is normal and no
chattering sound is heard.
Check that the output voltages across
phases are balanced while operating the
inverter alone.
Check that no fault is found in protective
and display circuits in a sequence
protective operation test.
Check for unusual odor and discoloration.
Check for serious rust development.
Check for liquid leakage in a capacitor and
deformation trace.
Visual check and judge by the life check of
the control circuit capacitor. (Refer to
600.)
Check for unusual vibration and noise.
Check for loose screws and bolts.
Check for stain.
Check for clogging.
Check for stain.
Inspection
interval
Daily Periodic
*3
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7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Corrective action Check
at fault occurrence by the
user
Improve the
environment.
Check fault location
and retighten.
Clean.
Inspect the power
supply.
Contact the
manufacturer.
Retighten.
Contact the
manufacturer.
Clean.
Contact the
manufacturer.
Contact the
manufacturer.
Stop the equipment
and contact the
manufacturer.
Stop the equipment
and contact the
manufacturer.
Contact the
manufacturer.
Contact the
manufacturer.
Contact the
manufacturer.
Contact the
manufacturer.
Contact the
manufacturer.
Stop the equipment
and contact the
manufacturer.
Contact the
manufacturer.
Contact the
manufacturer.
Replace the fan.
Fix with the fan
cover fixing screws
Clean.
Clean.
Clean.
597
7.1 Inspection item
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