10-12
Troubleshooting
Power Module and Interface
Board Resistance Check (cont.)
24–135 Amp
Remove the control module per the instructions beginning on page
10-6. Refer to Figure 10.7 for power module pin identification.
Shorted SCR Test
1. Using an ohmmeter, measure the resistance between the line and
load terminals of each phase on the controller.
The resistance should be greater than 10,000 ohms.
Feedback Resistance
1. Measure resistance between pins 1 and 2.
Resistance should be 19,000 ohms, +/–5%.
2. Measure resistance between pins 7 and 8.
Resistance should be 19,000 ohms +/–5%.
Gate Lead Resistance
1. Measure resistance between pins 2 and 3.
Resistance should less than 100 ohms.
2. Measure resistance between pins 6 and 7.
Resistance should be less than 100 ohms.
Thermistor Resistance
1. Measure resistance between pins 4 and 5.
Resistance should be less than 150 ohms.
If the power module fails any of the above tests, replace it.
Figure 10.7 Pin Locations for Power Module Resistance Check
2
3
7
6
1
8
4
5
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