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167
Precautions for Maintenance and Inspection
PROTECTIVE FUNCTIONS
6
6.3.6 Daily and periodic inspection
Area of
Inspection
Inspection
Item
Description
Interval
Method Criterion Instrument
Customer
Check
Daily
Periodic*
1 year
2 years
General
Surrounding
environment
Check
ambient
temperature,
humidity,
dust, dirt, etc.
#
Make
measurement
5cm away from
the inverter.
Ambient
temperature:
-10 °C to
+50 °C,
non-freezing.
Ambient
humidity: 90%
or less, non-
condensing.
Thermomet
er,
hygrometer,
recorder
Overall unit
Check for
unusual
vibration and
noise.
#
Visual and
auditory
checks.
No fault.
Power
supply
voltage
Check that
the main
circuit
voltage is
normal.
#
Measure
voltage across
the inverter
terminals
R,S,T.
Within
permissible
AC (DC)
voltage
fluctuation
(refer to page
178)
Meter,
digital
multimeter
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
earth
terminal
with
megger.
(2) Retighten.
(3) Visual
check.
(1)
5MΩ or more.
(2), (3) No
fault.
500VDC
class
megger