Brake the flywheel if the unit is going to be shut down over 20 minutes. Simultaneously press the "Ctrl" key and the "X" key on a PC that is connected to the UPS through UPS View.
- Shut down the UPS.
The UPS needs shut down before any work is done to the cabinet. Refer to the information in the Systems Operation, Testing and Adjusting, "UPS Shutdown".
- Make sure the unit is either locked out or tagged DO NOT OPERATE.
- Remove all fuses.
- Make sure the generator engine is stopped.
- Make sure all batteries are disconnected.
- Make sure all capacitors are discharged.
- Make sure residual voltage in the rotor, stator and the generator is discharged.
- De-energize the UPS.
All inputs to the UPS need de-energized. There are two possible inputs to the UPS. One of the inputs is in the Input/Output Cabinet. One of the inputs is in the Maintenance Bypass Cabinet.
Note: The Maintenance Bypass Cabinet is an option.
Open the breakers that are upstream to these two cabinets.
Note: Opening the breakers that are upstream to the following cabinets will de-energize the customer load: Input/Output Cabinet and Maintenance Bypass Cabinet
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When servicing or repairing electric power generation equipment: Failure to do so could result in personal injury or death. |
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When servicing or repairing electric power generation equipment: Make sure the unit is off-line (disconnected from utility and/or other generators power service), and either locked out or tagged DO NOT OPERATE. Remove all fuses. |
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- Discharge the capacitors.
Allow the capacitor banks in the UPS to purge for 10 minutes.
- Unlock the doors. Open the doors.
Use a 127.00 mm (5/16 inch) hex key on the upper and lower latches.
- Remove metal safety shields.
There are two metal safety shields covering the components in the cabinet. Remove the shields.