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CORRECTIVE MAINTENANCE
CV ELECTRICAL POWER SYSTEM MAINTENANCE MANUAL 2A5A2-ELEC-MM-1-0 18
Spare Parts
7533342 Hotel boost transformer assembly
Preconditions
None
Procedure
1. Follow instructions in Section 6.2, General Notes, regarding hazmat
requirements, torque specifications, inspection of mounting hardware, and use of
Nylok® nuts, as applicable.
2. Perform the following steps in accordance with local requirements for SOC and
tag in/out, as applicable.
3. In the CV, at the
POWER DISTRIBUTION UNIT, set POWER BUS #1 (2A5A2-1B-EP01-1)
and
POWER BUS #2 (2A5A2-CB-EP01-2) to OFF.
4. At the
480 V 3Ø DISTRIBUTION PANEL, turn off BUS #1 MAIN DISCONNECT (2A5A2-CB-
EPO8-1) and
BUS #2 MAIN DISCONNECT (2A5A2-CB-EPO8-2) switches.
5. Disconnect two (2) power wires and the voltage conditioner wires at the input
transformer tap.
6. At the transformer output, disconnect PRM hotel power and the ground fault
sensor wires.
7. Disconnect the ground cable.
8. Remove four (4) bolts securing the transformer and remove the transformer.
9. Install the replacement transformer.
10. Secure it with four (4) bolts.
11. Reconnect the ground cable.
12. Reconnect the input power wires and the voltage conditioner wires at tap
0 and
tap 210.
13. At the transformer output, reconnect PRM hotel power and the ground fault
sensor wires at tap
0 and tap 1900.
14. Perform high voltage test (see Section 4.4, Measuring High Voltage).
15. If voltage reading is not acceptable, repeat Steps 11 through 13. Ensure wires
are reconnected properly and the input voltage at the transformer is 208 VAC.
16. Restore power to the control van. Power up hotel power to the PRM and confirm
functionality.
17. Return valves and electrical switches to the state that they were in before this
procedure was performed.
18. Inspect and determine disposition of any parts removed. If applicable, dispose of
removed parts and/or fluids in accordance with local requirements.
19. Ensure the preceding steps were performed in accordance with local
requirements for SOC and tag in/out, as applicable.
0.