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11.3
11.4
c.
Abnormal
noise
.....
Inverter
and
motor
d.
Temperature
........
Ambient
temperature,
inverter
temperature
and
motor
temperature
increase
e.
Humidity
...........
90% Max.
(no
dew
condensation
is allowed)
f.
Oil
mist
and
coolant
.....
Check
that
the
oil
mist
or
coolant
do
not
enter
the
inverter
unit.
Periodical
check
items
a.
Loose
wiring
terminals
and
connectors
b.
Dust
or
dirt
in vent
hole
c.
PC
board
and
main
circuit
cleaning
(air
blow)
d.
Insulation
resistance
(See
Fig.
26.)
Checking
method
(a)
Output
voltage,
I/O current
and
input
power measuring
method
The
inverter
output
voltage
cannot
be measured
accurately,
using
a moving
iron
type
meter.
When
measuring
the
fundamental
wave
rms
value
Vac
contributing
direct
to motor
torque,
it
is
possible
to measure
this
value
approximately,
using
Fig.
21 circuit.
— 84 -
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