Technical data

CORRECTIVE MAINTENANCE
CV ELECTRICAL POWER SYSTEM MAINTENANCE MANUAL 2A5A2-ELEC-MM-1-0 19
4.7 Replacing a Service Transformer
DANGER!
Shock hazard! Verify power to the unit is isolated before performing this
maintenance procedure. This procedure exposes conductors that carry
high voltage sufficient to cause lethal electric shock.
When performing work in the CV power room, be aware of potential
exposure to high voltages sufficient to cause lethal electric shock.
Drawing References
7533008 CV power system wiring diagram
7533009 Power system assembly (2A5A2)
7533010 Power system cable routing
7533011 CV electrical power system schematic (2A5A2)
Special Tools
None
Spare Parts
CDTCD010RHA6XXBA Service Transformer – Delta Transformers
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. 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.
4. Remove four (4) bolts securing the transformer.
5. Open the transformer casing.
6. Disconnect wires at the service transformer.
7. Disconnect the ground cable.
8. Install the replacement transformer.
9. Reconnect the ground cable.
10. Reconnect the wires at the transformer.
11. Close the transformer casing.
12. Secure the transformer with four (4) bolts.
13. Restore power to the CV and confirm functionality.