GE AF-650 GP Operating Instructions Manual page 76

6.2.1.1 Soft Charge Fuse Test
This test is used to determine if any of the soft charge fuses are open.
Use the 12-pin connector on the top of the rectifier module for testing.
1. L1 to pins 6, 11, and 12 (red wires).
2. L2 to pins 4, 9, and 10 (white wires).
3. L3 to pins 2, 7, and 8 (black wires).
A measurement of 0 Ω indicates good continuity. Replace any open fuses
(infinite resistance). Note that the rectifier module must be removed to replace
fuses.
1 Rectifier module
6.2.1.2 Soft Charge and Rectifier Circuit Test
Both the rectifier and soft charge circuits are tested simultaneously. The soft charge circuit is made up of the soft charge rectifier, fuses and the soft charge
resistor. The rectifier circuit is made up of the SCR/Diode modules. The soft charge resistor limits the inrush current when power is applied to the drive. The soft
charge circuit card also provides snubbing for the SCRs.
It is important to pay close attention to the polarity of the meter leads to ensure identification of a faulty component should an incorrect reading appear.
Remove the safety covers to access the unit.
High Power Service Manual for Unit Sizes 6x
1
2 12-pin connector
6
2
75