PUMP ASSEM. 4N2511 - Caterpillar

System Shutdown Procedure
When the flywheel is spinning, the following components are energized:
Bus
Armature leads
Turn each system cabinet key switch to the Bypass position.
Turn each MMU key switch to the Bypass position.
Confirm that the system is in "Bypass" by observing the "System Diagram/Overview" screen shown in Illustration 1.Note: Continuing with the procedure will disconnect the critical load from the output of the UPS.
Disconnect the facility load circuits from the output.
Remove facility power from the input.
Remove facility power from the "Bypass" input.
Allow the capacitor banks to purge for approximately 5 minutes to dissipate any residual energy in the bus and armature leads.
Open (de-energize) the MMU output isolation switches located in the system cabinet for the appropriate MMUs.
Open (de-energize) the MMU input isolation switches located in the system cabinet for the appropriate MMUs.
Illustration 1 g03881097
System overview screen confirming system bypassed and load not protected