Inspec-
tion cat-
egory
Inspec-
tion item
Inspection point
Inspection
frequency
Inspection method Criteria Meter
Daily
Peri-
odic
1 year
2 years
Control
circuit,
protec-
tion cir-
cuit
Opera-
tion
check
Check output volt-
age balance be-
tween phases
during stand-
alone inverter op-
eration.
Required
Measure the line
voltage between the
inverter main circuit
terminals U, V and
W.
Phase-to-phase
voltage balance
Digital
multime-
ter
Rectifier
Voltmeter
200-V
class:
4 V
max.
400-V
Class:
8 V
max.
Check that there
is no error in pro-
tection and dis-
play circuits
through sequence
protection func-
tion test.
Required
Short-circuit or open
the inverter protec-
tion circuit output un-
der simulated condi-
tions.
Error is found in
the sequence.
Cooling
system
Cooling
fan
There is no ab-
normal vibration
or sound.
Required
Rotate the fan man-
ually with the power
off.
Smooth rotation,
no faults
*2
Check for loose
connections.
Required
Perform visual in-
spection.
Cooling
fin
Check for clog-
ging.
Required
Perform visual in-
spection.
No clogging.
Display Display Check that the
LED indicators
are lit properly.
Required
Perform visual in-
spection.
The LED indica-
tors are lit.
Perform cleaning.
Required
Clean with rags.
Meter Check indicated
value.
Required
Check the indicated
values on panel me-
ters.
Specified value,
control value
Voltme-
ter, am-
meter,
etc.
10 Maintenance and Inspection
10-5
M1 Series Standard Type User's Manual (I669)
10-1 Maintenance and Inspec-
tion
10
10-1-4 Daily/Periodic Inspection Items
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