HP Anab EQ5 - Manual (Page 108)

EQ5 AC Drive Operations Manual
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TECO – Westinghouse Motor Company Insulation Testing &Parts Replacement 102
7- 4 Insulation Test
It is not necessary to do an insulation test on the inverter as this was completed at the factory. If an
insulation test with a megger test must be completed, then proceed as described below as an
incorrect testing method may result in product damage.
If a dielectric strength test must be completed, the specifications for the test must be followed as
Improper testing may result in damage to the inverter. Please contact your local distributor or nearest
TWMC sales office for further guidance.
(1) Megger test for the main power circuit.
a - Use a 500V DC type megger and isolate the main power before commencing measurement.
b - If the test voltage is connected to the control circuit, remove all connection cables to the control
circuit.
c - Connect the main circuit terminals together using common cables as shown in Fig. 7-4-1.
d - Perform the megger test only between the common cables connected to the main circuit and the
ground (terminal G).
e - A megger indicating a reading of 5M
Ω or more is normal. (This is the value measured with only
the inverter connected.)
Fig. 7-4-1 Main Circuit Insulation Test
(2) Insulation test in the control circuit.
A megger test and a dielectric strength test must not be performed on the control circuit or damage
will result. To test the control circuit, use a high resistance range multimeter and proceed as follows.
a - Remove all external cables from the control circuit terminals.
b - Conduct a continuity test between the isolated control circuit grounds. A result of 1M
Ω 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.
7-5 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 7-5-1 Parts Replacement.
Table 7-5-1 Parts 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.