GE AF-300 P11 User Manual

Contents

8-5Data subject to change without notice 7/07. © 2007 GE Drives8.4 Insulation TestAvoid 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 circuit1. 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 circuitMegger and dielectric strength tests are not performed on the control circuit. Use a resistance multimeter with a highresistance 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 circuitRemove all cables from drive terminals to ensure that test voltage is not applied to the drive.8.5 Replacement PartsThe life expectancy of a part depends on the type of part, the environment, and operating conditions. Parts should bereplaced as shown in Table 8-5-1.Table 8-5-1 Part replacementPart name Standard period forreplacement CommentsCooling fan 3 years Exchange for a new partSmoothing capacitor 5 years Exchange for a new part (determine after checkingElectrlytic capacitor on the PC board 7 years Exchange for a new PC board (determine after checking)Fuse 10 years Exchange for a new partOther parts — Determine after checking