6-5
6-1 Inspection and Maintenance
6
Inspection and Maintenance
Control
circuit
Protection
circuit
Operation
check
Check the balance
of output voltage
levels between
phases in single
Inverter run.
Measure the voltage
between Inverter
main circuit terminals
U/T1, V/T2, and
W/T3.
Phase-to-phase
voltage balance
200-V class:
4 V max.
400-V class:
8 V max.
Digital
multimeter
Rectifier
Voltmeter
Check that there
are no errors in
protection and
display circuits
through sequence
protection
operation.
Short-circuit or open
the Inverter protection
circuit output under
simulated conditions.
Error is found in
the sequence.
Cooling
system
Cooling fan
Check that there
are no abnormal
vibration or
sounds.
Rotate manually
when the power is off.
Rotates
smoothly.
No faults
Reference of
the replacement
period: 10 years
*2 *3
Check that the
connection parts
are secure.
Visual inspection
Fin
Check that there is
no clogging.
Visual inspection No clogging.
Display
Display
Check that the
LED indicators are
lit properly.
Visual inspection
Check that the
LED indicators
are lit properly.
Cleaning
Clean with a soft
cloth.
Meter
Check that the
indicated value is
normal.
Check the indicated
values on the panel
meters.
The specified or
control values
must be
satisfied.
Voltmeter,
ammeter
Inspection
part
Inspection
item
Inspection point
Inspection period
Inspection method Criteria Meter
Daily
Periodic
1 year 2 years
*1. The life of the smoothing capacitor depends on ambient temperature.
Refer to "Appendix-2 Product Life Curve" for the replacement reference.
*2. The life of the cooling fan varies depending on the environmental conditions, such as ambient temperature
and/or dust. Check the operation through daily inspections.
*3. The replacement reference (year/cycle) or "
Appendix-2 Product Life Curve" is based on the expected design
life, which is not guaranteed.
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