Mitsubishi Electric FR-F500 Series, Инструкция по эксплуатации

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PROTECTIVE FUNCTIONS
180
5.3.4 Insulation resistance test using megger
1) Before performing the insulation resistance test using a megger on the external circuit, disconnect the
cables from all terminals of the inverter so that the test voltage is not applied to the inverter.
2) For the continuity test of the control circuit, use a meter (high resistance range) and do not use the megger
or buzzer.
3) For the inverter, conduct the insulation resistance test on the main circuit only as shown below and do not
perform the test on the control circuit. (Use a 500VDC megger.)
R
〈
L
1
〉
S
〈
L
2
〉
T
〈
L
3
〉
U
V
W
IM
Inverter
Motor
Power
supply
500VDC
megger
Earth (Ground) terminal
5.3.5 Pressure test
Do not conduct a pressure test. The inverter's main circuit uses semiconductors, which may be deteriorated if
a pressure test is made.
5.3.6 Daily and Periodic Inspection
Interval
Periodic
Area of
Inspec-
tion
Inspection
Item
Description
Daily
1
year
2
years
Method Criterion Instrument
Custom
er's
check
Surrounding
environment
Check ambient
temperature,
humidity, dust, dirt,
etc.
$
(Refer to page 7)
Ambient
temperature:
(constant torque)
−
10
º
C to +50
º
C
(14 º F to 122 º F),
non-freezing.
(Variable torque)
−
10
º
C to +40
º
C
(14
º
F to 104
º
F),
non-freezing
Ambient humidity:
90% or less,
non-condensing.
Thermometer,
hygrometer,
recorder
Overall unit
Check for unusual
vibration and noise.
$
Visual and auditory
checks.
No fault.
General
Power
supply
voltage Check that main
circuit voltage is
normal.
$
Measure voltage
across inverter
terminals R-S-T
〈
L
1
-L
2
-L
3
〉
.
Within permissible
AC voltage
fluctuation
(Refer to page 187)
Meter, digital
multimeter
General
(1) Check with
megger (across
main circuit
terminals and
earth (ground)
terminal).
(2) Check for loose
screws and bolts.
(3) Check for
overheat-ing of
each part.
(4) Clean.
$
$
$
$
(1) Disconnect all
cables from
inverter and
measure across
terminals R, S, T,
U, V, W
〈
L
1
, L
2
, L
3
,
U, V, W
〉
and
earth (ground)
terminal with
megger.
(2) Re-tighten.
(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.
Main
circuit
Terminal
block
Check for damage.
$
Visual check. No fault
* For periodic inspection, consult Mitsubishi.