GE AF-300 P11, User Manual

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8-5
Data subject to change without notice 7/07. © 2007 GE Drives
8.4 Insulation Test
Avoid megger testing on an drive since an insulation test was completed at the factory. If a megger test must be com-
pleted, proceed as described below. Incorrect testing methods may result in product damage.
If the specifications for the dielectric strength test are not followed, the drive may be damaged.
(1) Megger test for the main circui t
1. Use a 500V DC megger and isolate the main power before starting 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. Perform the megger test only between the common cables connected to the main circuit and ground
(Terminal ).
5. A megger indicating 5M Ohm or more is normal. (This is the value measured with only the drive connected.)
(2) Insulation test in the control circuit
Megger and dielectric strength tests are not performed on the control circuit. Use a resistance multimeter with a high
resistance range to check the control circuit.
1. Remove all external cables from the control circuit terminals.
2. Conduct a continuity test between grounds. A result of 1M Ohm or more is normal.
(3) Exterior main circuit and sequence control circuit
Remove all cables from drive terminals to ensure that test voltage is not applied to the drive.
8.5 Replacement Parts
The life expectancy of a part depends on the type of part, the environment, and operating conditions. Parts should be
replaced as shown in Table 8-5-1.
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
Electrlytic 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