LS ELECTRIC SV-iS7 Series, User Manual

Page: 416 / 491

399
Troubleshooting and Maintenance
Func
tio
n
Table
Inspection
area Inspection
item Inspection
details
Inspection Cycle
Inspection
method Judgment
standard Inspection
equipment
Daily
Regular
(Year)
1
2
Control
circuit
Protection
circuit
Operation
check
1) Check for
output voltage
imbalance while
the inverter is in
operation.
2) Is there an
error in the
display circuit
after the
sequence
protection test?


1) Measure
voltage between
the inverter output
terminals U/V/W.
2) Test the inverter
output protection
in both short and
open circuit
conditions.
1) Balance the
voltage between
phases: within 4 V
for 200 V series
and within 8 V for
400 V series.
2) The circuit must
work according to
the sequence.
Digital
multimeter or
DC voltmeter
Cooling
system
Cooling fan
1) Is there any
abnormal
vibration or
sound?
2) Are any of the
fan parts loose?


1) Turn it manually
while the inverter
is turned off.
2) Check all
connected parts
and tighten all
screws.
1) It should turn
smoothly.
2) No abnormality
Display Meter
Is the display
value normal?
 
Check the
command value
on the display
device.
Specified and
managed values
must match.
Voltmeter,
ammeter, etc.
Motor
Total
1) Are there any
abnormal
vibrations or
sound?
2) Is there any
abnormal smell?


1) Visual
inspection
2) Check the
abnormality, such
as overheating,
damage, etc.
No abnormality
Isolation
resistance
Megger test
(between the
input, output
and earth
terminals).

Disconnect the
cables for
terminals U/V/W
and test the
wiring.
Must be above 5
MΩ .
DC 500 V
Megger
If the inverter has not been operated for a long time, capacitors lose their charging capability and
are depleted. To prevent depletion, turn on the inverter once a year and allow it to operate for 30-
60 minutes. Run the inverter under no-load conditions.