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Since the inverter is of the static type, daily inspection and adjustment are rarely required and easy
maintenance is ensured. When maintenance and inspectton are performed, however, take care of the
following polnts:
( 1
)
The capacitor remalns charged at high voltage for a while after the power is shut off. Therefore,
make checks after the POWER lamp In the setting panel goes off.
The POWER lamp also acts as an indicator which shows the charg~ng state of capacitor voltage.
(2)
From time to time, check if dust and dirt have accumulated inside the inverter. If found,
remove dust and dirt. Check ventilation is clear.
(3)
Check if the terminal block screws and parts mounting screws are loose. When they are loose,
retighten them securely. Also, check if there are defects in the wiring instruments, parts, etc.
Replace defective ones or contact your service representative.
(4) Insulation res~stance test using a megger
a) Before performing the insulat~on
resistance
test of ekterna~ circuit by use of
a
megger,
disconnect wlres from all terminals of inverter so that test voltage is not applied to the
Inverter.
b) Conduct the insulation resistance test of inverter only for the main circult as shown in the
figure below and do not make the test for the control circuit.
C )
To check the control circuit for continuity, use a circuit tester (high resistance range) and
do not use a megger or a buzzer.
d) Before the insulation resistance test of
F R-K-S1500
and
S2200
by use of a megger, discon-
nect the earth wire (green shield) connected to the earth terminal.
- - - - - -
Inverter
Power supply
- -
FR-K
Fig. 14 lnsulat~on Res~stance Test Using Megger
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