
Maintenance
363
M
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ten
an
ce
Inspection
area
Item
Details
Method
Standard
Equipment
connectors.
Replace the
inverter when
parts that
cannot be
repaired or
replaced are
damaged.
Control
circuit
protection
Operation
check
Check for output
voltage imbalance
during inverter
operation.
Measure the
voltage
between the
inverter output
terminals U/ V/
W.
Balance the
voltage
between
phases to
within 8 V.
Digital
multimeter or
DC voltmeter
Does the
sequence
protection test
identify any
keypad display
errors?
Test the
protection for
the inverter
output in both
short and open
circuit
conditions.
The circuit
must operate
according to
the sequence.
Cooling
system
Cooling fan,
Cooling fins
Are any parts of
the fan loose?
Check all
connected
parts and
tighten all
screws.
No abnormality
-
Is there any dust
present on the
cooling fan or the
cooling fins?
Visual
inspection
No dust
Display
Display
device
Is the display
value normal?
Check the
command
value on the
Specified and
managed
values must
Voltmeter,
Ammeter, etc.