8-5
8-4 Insulation Test
Because an insulation test is made in the factory before shipment, avoid a Megger test. If a Megger test is
unavoidable, follow the procedure below. Because a wrong test procedure will cause breakage of the
inverter, take sufficient care.
A withstand voltage test will cause breakage of the inverter similarly to the Megger test if the test
procedure is wrong. When the withstand voltage test is necessary, contact your dealer or nearest Fuji
Electric's branch.
(1) Megger test of main circuit
1) Use a 500 VDC Megger and shut off the main power supply without fail during measurement.
2) If the test voltage leaks to the control circuit due to the wiring, disconnect all the control wiring.
3) Connect the main circuit terminals with a common cable as shown in Fig. 8-4-1.
4) The Megger test must be limited to across the common line of the main circuit and the ground terminal
(
G
).
5) M
or a larger value displayed at the Megger indicates a correct state. (The value is for a discrete
inverter.)
(2) Do not perform a Megger test or withstand voltage test to the insulation test control circuit of the control
circuit. Prepare a high resistance range tester for the control circuit.
1) Disconnect all the external wiring from the control circuit terminals.
2) Perform a continuity test to the ground. 1 M
or a larger measurement indicates a correct state.
(3) External main circuit and sequence control circuit
Disconnect all the inverter terminals so that the test voltage is not applied.
8-5 Replacement Parts
The life of the part is determined by the type of the part. The life of the part varies according to the
environment and operating conditions, and replacement according to Table 8-5-1 is recommended.
8-6 Inquiries about Product and Guarantee
(1) When making an inquiry
Upon breakage of the product, uncertainties,
failure or inquiries, report the following
information to your dealer or nearest Fuji
Electric's branch.
a) Inverter type
b) SER NO. (serial number of equipment)
c) Date of purchase
d) Inquiries (for example, point and extent of
breakage, uncertainties, failure phenomena,
and other circumstances)
(2) Guarantee of the product
The product guarantee term is one year after the purchase or 24 months from the month and year of
production specified on the nameplate, whichever comes first. However, the product will not be
repaired free of charge in the following cases, even if the guarantee term has not expired.
a) The cause includes incorrect usage or inappropriate repairs or remodeling.
b) The product is used outside the standard specified range.
c) The failure is caused by dropping, damage or breakage during transportation after the purchase.
d) The cause is earthquake, fire, storm or flood, lightening, excessive voltage, or other types of act of God
or secondary disasters.
Name of part
Standard
replacement
years
Replacement
method and others
Cooling fan
3 years
Replace with a new
part.
Smoothing
capacitor 5 years
Replace with a new
part. (Replace after
inspection.)
Electrolytic
capacitors on
printed circuit
board
7 years
Replace with new
circuit board.
(Replace after
inspection.)
Other parts
－
Determine after
Fig. 8-4-1
Megger test
Table 8-5-1 Replacement parts
(L1/L)
(L2/N)
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