Omron M1 Series

Inspec-
tion cat-
egory
Inspec-
tion item
Inspection point
Inspection
frequency
Inspection method Criteria Meter
Daily
Peri-
odic
1 year 2 years
Main cir-
cuit
General Perform megger
check
(Between main
circuit terminals
and ground termi-
nal).
Required
Disconnect I/O wires
from the inverter
main circuit terminal
block and remove
the control terminal
block PCB. Then, af-
ter removing the
short-circuit bar for
switching the inverter
built-in filter function,
measure using a
megger the resist-
ance between the
ground terminal and
the short-circuited
terminals L1/R, L2/S,
L3/T, U, V, W, P(+),
P1, N(-) and DB.
5 MΩ min. 500-VDC
class
megger
Check for loose
bolts and screws.
Required
Retighten loose bolts
and screws.
No faults
Check each part
for traces of over-
heating.
Required
Perform visual in-
spection.
No faults
Conduc-
tors/
wires
Check for distort-
ed conductors.
Required
Perform visual in-
spection.
No faults
Check for broken
cable sheaths.
Required
Terminal
Blocks
Check for dam-
age.
Required
Perform visual in-
spection.
No faults
Smooth-
ing ca-
pacitor
*1
Check that there
is no liquid leak-
age.
Required
Perform visual in-
spection.
No faults Capacity
meter
Check that the
safety valve does
not come out and
that there is no
bulge.
Required
Relay Check for chatter-
ing sound during
operation.
Required
Perform acoustic in-
spection.
No faults
Check for rough
contact surface.
Required
Perform visual in-
spection.
No faults
10 Maintenance and Inspection
10-4
M1 Series Standard Type User's Manual (I669)