Omron M1 Series User Manual page 782

10 Maintenance and Inspection
Inspec-
Inspec-
tion cat-
tion item
egory
Main cir- General
cuit
Conduc-
tors/
wires
Terminal
Blocks
Smooth-
ing ca-
pacitor
Relay
10-4
Inspection
frequency
Inspection point
Perform megger
check
(Between main
circuit terminals
and ground termi-
nal).
Check for loose
bolts and screws.
Check each part
for traces of over-
heating.
Check for distort-
ed conductors.
Check for broken
cable sheaths.
Check for dam-
age.
Check that there
is no liquid leak-
age.
*1
Check that the
safety valve does
not come out and
that there is no
bulge.
Check for chatter-
ing sound during
operation.
Check for rough
contact surface.
Peri-
Inspection method
odic
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.
Retighten loose bolts
and screws.
Perform visual in-
spection.
Perform visual in-
spection.
Perform visual in-
spection.
Perform visual in-
spection.
Perform acoustic in-
spection.
Perform visual in-
spection.
M1 Series Standard Type User's Manual (I669)
Criteria Meter
5 MΩ min. 500-VDC
class
megger
No faults
No faults
No faults
No faults
No faults Capacity
meter
No faults
No faults