LS Industrial Systems iG5A - Annual Inspections

3. Maintenance
3.1.2 Annual inspections
Inspection
method
Judgment
standard
Inspection
equipment
Inspection
method
Judgment standard
Inspection
equipment
Input/Outpu
t circuit
All
Megger test
(between
input/output
terminals and and
earth terminal)
Disconnect
inverter and
short
R/S/T/U/V/W
terminals, and
then measure
from each
terminal to the
ground
terminal using
a Megger.
Must be above 5
MΩ
DC 500 V Megger
Is there anything
loose in the
device?
Tighten up all
screws.
No abnormality
Is there any
evidence of parts
overheating?
Visual
inspection
Cable
connection
s
Are there any
corroded cables?
Visual
inspection
No abnormality
-
Is there any
damage to cable
insulation?
Terminal
block
Is there any
damage?
Visual
inspection
No abnormality
-
Smoothing
condenser
Measure
electrostatic
capacity.
Measure with
capacity
meter.
Rated capacity over
85%
Capacity meter
Relay
Is there any
chattering noise
during operation?
Visual
inspection
No abnormality
-
Is there any
damage to the
contacts?
Visual
inspection
Braking
resistor
Is there any
damage from
resistance?
Visual
inspection
No abnormality
Digital multimeter /
analog tester
Check for
disconnection.
Disconnect
one side and
measure with
a tester.
Must be within
±10% of the rated
value of the resistor.
Control
circuit
Protection
circuit
Operation
check
Check for output
voltage imbalance
while the inverter is
in operation.
Measure
voltage
between the
inverter output
terminal U/ V/
W.
Balance the voltage
between phases:
within 4V for 200V
series and within 8V
for 400V series.
Digital multimeter
or DC voltmeter