Technical data

TROUBLESHOOTING

CV ELECTRICAL POWER SYSTEM MAINTENANCE MANUAL 2A5A2-ELEC-MM-1-0 34

5.2 Troubleshooting Subroutine — 10 kVA 480-208/120 VAC 3Ø

Transformer #1 or #2 Power Check

Procedure

1. Follow the troubleshooting steps in Figure 1.

At the 10 kVA 480-208/120 VAC 3ø transformer #1 or #2,

measure voltage at the input:

Yes

Voltage OK? No Done

Measure voltage at output:

Yes

Voltage OK? No

Negative Probe Positive Probe Acceptable Readings

øA

øB

øB 480 ± 48 VAC

øC 480 ± 48 VAC

øC

480 ± 48 VAC

Negative Probe Positive Probe Acceptable Readings

øA 120 ± 12 VAC

øB 120 ± 12 VAC

øC 120 ± 12 VAC

Problem is upstream ( see PRMS-

MSE-AE Deck Interconnects-Electrical

Maintenance Manual (2A13A9-

INCONELEC-MM), Troubleshooting)

Replace transformer (see Section 4.7,

Replacing a Service Transformer)

Return to decision tree that

requested this subroutine

Figure 1 Troubleshooting Subroutine – 10 kVA 480-208/120 VAC 3Ø Transformer #1

or #2 Power Check