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8-5
8-4 Insulation Test
Avoid testing an inverter with a megger because an insulation test is completed at the factory. If a
megger test must be completed, proceed as described below. Use of an incorrect testing method
may result in product damage.
If the specifications for the dielectric strength test are not followed, the inverter may be damaged.
If a dielectric strength test must be completed, contact your local distributor or nearest Fuji Electric
sales office.
(1) Megger test for the main circuit
① Use a 500V DC type megger and isolate the main power before commencing measurement.
② If the test voltage is connected to the control circuit, remove all connection cables to the control
circuit.
③ Connect the main circuit terminals using common cables as shown in Fig. 8-4-1.
④ Execute the megger test only between the common cables connected to the main circuit and the
ground (terminal G).
⑤ A megger indicating 5MΩ or more is normal. (This is the value measured with an inverter only.)
(2) Insulation test in the control circuit
A megger test and a dielectric strength test must not be performed in the control circuit. Prepare a high
resistance range multimeter for the control circuit.
① Remove all external cables from the control circuit terminals.
② Conduct a continuity test between grounds. A result of 1MΩ or more is normal.
(3) Exterior main circuit and sequence control circuit
Remove all cables from inverter terminals to ensure the test voltage is not applied to the inverter.
8-5 Parts Replacement
The life expectancy of a part depends
on the type of part, the environment,
and usage conditions. Parts should
be replaced as shown in Table 8-5-1.
8-6 Inquiries about Products and Product Guarantee
(1) Inquiries
If there is damage, a fault in the product, or questions concerning the product, contact your local distributor
or nearest Fuji Electric sales office:
a) Inverter type
b) Serial No. (equipment serial number)
c) Purchase date
d) Inquiry details (e.g., damaged part, extent of damage, questions, status of fault)
Table 8-5-1 Part replacement
Part name Standard
period for
replacement
Comments
Cooling fan 3 years Exchange for a new part.
Smoothing
capacitor
5 years Exchange for a new part
(determine after checking).
Electrolytic
capacitor on the
PC board
7 years Exchange for a new PC board
(determine after checking).
Fuse 10 years Exchange for a new part.
Other parts
－
Determine after checking.
Fig. 8-4-1
Megger test