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Precautions for maintenance and
inspection
* Values in parentheses indicate those for 400V class.
*Consult us for periodic inspection.
6.5.7 Replacement of parts
The inverter consists of many electronic parts such as semiconductor devices.
The following parts may deteriorate with age because of their structures or physical characteristics, leading to
reduced performance or fault of the inverter. For preventive maintenance, the parts must be replaced periodically.
Display
Display
(1) Check for LED lamp
blown.
(2) Clean.
"
"
(1) Lamps indicate
indicator lamps on
panel.
(2) Clean with rag.
(1) Check that lamps
are lit.
Meter
Check that reading is
normal.
"
Check the readings of
the meters on the panel.
Must satisfy
specified and
management
values.
Voltmeter,
ammeter, etc.
Motor
General
(1) Check for unusual
vibration and noise.
(2) Check for unusual
odor.
"
"
(1) Auditory, sensory,
visual checks.
(2) Check for unusual
odor due to
overheat, damage,
etc.
(1), (2) No fault.
Insulation
resistance
Check with megger
(across terminals and
earth (ground)
terminal).
"
Disconnect cables from
U, V, W (including motor
cables).
5MΩ or more. 500V megger
Part Name Standard Replacement Interval Description
Cooling fan 2 to 3 years Replace (as required)
Main circuit smoothing capacitor 10 years Replace (as required)
On-board smoothing capacitor 10 years Replace the board (as required).
Relays — Replace as required.
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
Area of
Inspection
Inspection
Item
Description
Interval
Method Criterion Instrument
Customer’s
check
Daily
Periodic*
1 year
2 years