Insulation Resistance Test Using Megger; Pressure Test; Daily And Periodic Inspection - Mitsubishi Electric FR-F500 Series Instruction Manual

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.)

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

Area of
Inspection
Inspec-
Item
tion
Check ambient
Surrounding temperature,
environment humidity, dust, dirt,
etc.
General
Check for unusual
Overall unit
vibration and noise.
Power Check that main
supply circuit voltage is
voltage normal.
(1) Check with
General
(2) Check for loose
(3) Check for
Main
circuit
(4) Clean.
(1) Check conductors
Conductors,
(2) Check cable
cables
Terminal
Check for damage.
block
Power
supply
500VDC
megger
Interval
Description
Daily
year
$
$
$
megger (across
main circuit
terminals and
earth (ground)
terminal).
screws and bolts.
overheat-ing of
each part.
for distortion.
sheaths for
breakage.
PROTECTIVE FUNCTIONS
R 〈L 〉
Inverter
U
1
S 〈L 〉
V
2
T 〈L 〉
W
3
Earth (Ground) terminal
Periodic
Method
1 2
years
(Refer to page 7)
Visual and auditory
checks.
Measure voltage
across inverter
terminals R-S-T
〈L 〉.
-L -L
1 2 3
$
(1) Disconnect all
cables from
inverter and
measure across
terminals R, S, T,
U, V, W 〈L
, L
1
$
U, V, W〉 and
earth (ground)
$
terminal with
megger.
(2) Re-tighten.
$
(3) Visual check.
$
$
(1), (2) Visual check.
$
Visual check.
180
Motor
IM
Criterion
Ambient
temperature:
(constant torque)
−10ºC to +50ºC
(14ºF to 122ºF),
Thermometer,
non-freezing.
(Variable torque) hygrometer,
−10ºC to +40ºC
recorder
(14ºF to 104ºF),
non-freezing
Ambient humidity:
90% or less,
non-condensing.
No fault.
Within permissible
AC voltage Meter, digital
fluctuation multimeter
(Refer to page 187)
(1) 5M Ω or more.
, L , 500VDC class
2 3
(2), (3) No fault. megger
(1), (2) No fault.
No fault
* For periodic inspection, consult Mitsubishi.
Instrument