Technical data

TROUBLESHOOTING

CV ELECTRICAL POWER SYSTEM MAINTENANCE MANUAL 2A5A2-ELEC-MM-1-0 37

5.5 HPU Power #1 or #2 Doesn't Work

Procedure

1. Follow the troubleshooting steps in Figure 4.

Yes

Voltage OK?

At the HPU #1 or #2 boost transformer input, measure voltage

for each phase (3):

Negative Probe Positive Probe Acceptable Readings

øA tap 480

øB tap 480

480 ± 48 VAC

øC tap 480 480 ± 48 VAC

Replace HPU boost transformer

(see Section 4.5, Replacing an

HPU Boost Transformer)

Problem is upstream ( see PRMS-

MSE-AE Deck Interconnects-Electrical

Maintenance Manual (2A13A9-

INCONELEC-MM), Troubleshooting)

Figure 4 Troubleshooting – HPU Power #1 or #2 Doesn't Work