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151
Interval
Periodic*
Area of
Inspection
Inspection
Item
Description
Daily
1 year
2 years
Method Criterion Instrument
General
General
(1) Check with
megger
(across
main circuit
terminals
and ground
terminal).
(2) Check for
loose screws
and bolts.
(3) Check for
overheat on
each part.
(4) Clean.
(1) Disconnect
all cables
from inverter
and measure
across
terminals R,
S, T, U, V, W
and ground
terminal with
megger.
(2) Retighten.
(3) Visual check.
(1) 5M
Ω
or
more.
(2), (3) No
fault.
500VDC
class
megger
Conductors,
cables
(1) Check
conductors
for distortion.
(2) Check cable
sheaths for
breakage.
(1), (2) Visual
check.
(1), (2) No fault.
Terminal
block
Check for
damage.
Visual check No fault
Inverter
module
Converter
module
Check
resistance
across
terminals.
Disconnect
cables from
inverter and
measure across
terminals R, S,
T
↔
P, N, and
across U, V,
W
↔
P, N with a
meter with a
100
Ω
range.
Refer to page
153.
Analog
meter
Smoothing
capacitor
(1) Check for
liquid
leakage.
(2) Check for
safety valve
projection
and bulge.
(3) Measure
electrostatic
capacity.
(1), (2) Visual
check.
(3) Measure with
capacity
meter.
(1), (2) No fault.
(3) 85% or
more of
rated
capacity.
Capacity
meter
Main circuit
Relay
(1) Check for
chatter
during
operation.
(2) Check for
rough
surface on
contacts.
(1) Auditory
check.
(2) Visual check.
(1) No fault.
(2) No fault.