Daily And Periodic Inspection - Mitsubishi Electric 800 Series Instruction Manual

3.1.3

Daily and periodic inspection

Area of Inspection
inspection item
Surrounding
environment
Overall unit
General
Power supply
voltage
General
Conductors and
cables
Transformer/
reactor
Main circuit
Terminal block
Smoothing
aluminum
electrolytic
capacitor
Relay/contactor
Resistor
Operation
check
Control
circuit,
protection Overall
circuit
Aluminum
electrolytic
capacitor
Cooling fan
Cooling
system
Heatsink
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 material.
Check that the main circuit voltage and control circuit
*2
voltage are normal.
• Check with megger (between main circuit terminals
and earth (ground) terminal).
• Check for loose screws and bolts.
• Check for overheat traces on the parts.
• Check for stains.
• 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 page
Check that the operation is normal and no chattering
sound is heard.
• Check for cracks in the resistor insulator.
• Check for a break in the cable.
• Check for an output voltage imbalance between
phases 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 page
• Check for unusual vibration and noise.
• Check for loose screws and bolts.
• Check for stains.
• Check for clogging.
• Check for stains.
Inspection
interval
Daily Periodic
○
○
*1
○
○
○
○
○
○
○
○
○
○
○
○
○
44.)
○
○
○
○
○
○
○
○
○
44.)
○
○
○
○
○
3. Precautions for Maintenance and Inspection
Corrective action
Check by
at fault
user
*3
occurrence
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.
Contact the
manufacturer.
Locate the fault
and check the
wiring.
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.
3.1 Inspection item
1
2
3
4
5
6
7
8
9
10
42