Mitsubishi Electric FATEC FR-A800 Manual page 52

4
PREVENTIVE MAINTENANCE
(Note) Understand the contents of the power supply display indicating that the inverter is running
and error (fault) display indicating a trouble on general inverter. Also check the electronic
thermal O/L relay and the acceleration/deceleration time from the parameter unit, and
record the normal setting value.
Refer to the table on the next page for items and judgement criteria of daily and periodic inspections.
Inspection
Inspection item
area
Surrounding
environment
Overall unit
Power supply
voltage
General
Conductors, cables
Transformer/
Reactor
Terminal block
Smoothing
aluminum
electrolytic capacitor
Relay/contactor
Resistor
Daily and periodic inspection
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
voltages and control voltages are

normal.
(1) Check with megger (across
main circuit terminals and
earth (ground) terminal).
(2) Check for loose screws and
bolts.
(3) Check for overheat traces on
the parts.
(4) Check for stain.
(1) Check conductors for
distortion.
(2) Check cable sheaths for
breakage and deterioration
(crack, discoloration, etc.).
Check for unusual odor and
abnormal increase of whining
sound.
Check for a damage.
(1) Check for liquid leakage.
(2) Check for safety valve
projection and bulge.
(3) Visual check and judge by the
life diagnosis of the main
circuit capacitor.
Check that the operation is normal
and no chattering sound is heard.
(1) Check for crack in resistor
insulation.
(2) Check for a break in the cable.
Inspection
Corrective action at fault
interval
Periodic
occurrence
Daily

 Improve the environment.
Check fault location and retighten

the screws.
 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.
4.2 Maintenance and inspection
1
2
Customer's
check
3
4
5
6
7
8
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