Inspec-
tion cat-
egory
Inspec-
tion item
Inspection
point
Inspec-
tion fre-
quency
Inspection method Criteria Meter
Daily
Peri-
odic
1 year
2 years
Main cir-
cuit
Relay Check for chat-
tering sound
during opera-
tion.
Required
Perform acoustic in-
spection.
No faults
Check for
rough contact
surface.
Required
Perform visual in-
spection.
No faults
Control
circuit,
protec-
tion cir-
cuit
Opera-
tion
check
Check output
voltage bal-
ance between
phases during
stand-alone in-
verter opera-
tion.
Required
Measure the line
voltage between the
inverter main circuit
terminals U, V and
W.
Phase-to-phase volt-
age balance
Digital
multime-
ter
Rectifier
Voltmeter
200-V
class:
4 V max.
400-V
Class:
8V max.
Check that
there is no er-
ror in protec-
tion and dis-
play circuits
through se-
quence protec-
tion function
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 vibra-
tion or sound.
Required
Rotate the fan man-
ually with the power
off.
Smooth rotation, no
faults
*2
Check for
loose connec-
tions.
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 indicators
are lit.
Perform clean-
ing.
Required
Clean with rags.
10 Maintenance and Inspection
10-5
M1 Series EtherCAT Type User’s Manual (I670)
10-1 Maintenance and Inspec-
tion
10
10-1-4 Daily/Periodic Inspection Items
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