Eaton 9355 Installation And Operation Manual

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UPS MaintenanceEaton 9355 UPS (20/30kVA) Installation and Operation Manual 164201626—Rev F www.eaton.com/powerquality 81Single UPS BypassTo transfer the load from the UPS to maintenance bypass:1. Remove the UPS front door (see page 10).2. From any UPS, set the system to internal Bypass mode:l Using the button on the front panel display, scroll to the Control menu option and press the button.l Press the button to select the Go to Bypass Mode option.The indicator illuminates and the indicator extinguishes, indicating the UPS system is operatingin Bypass mode.3. Turn the maintenance bypass switch to the BYPASS position.The input and battery circuit breakers trip, and the UPS is now bypassed, with the load powered by utilitypower.4. The UPS automatically shuts down.Rear fan is running signifying load is being supplied utility power on bypass.5. If present, switch the UPS output circuit breaker to the OFF position6. Replace the UPS front door.To transfer the load from maintenance bypass to the UPS:1. Remove the UPS front door (see page 10).2. Turn the maintenance bypass switch to the SERVICE position.The UPS starts up in Bypass mode, with the load still powered by utility power.3. Verify all six fans on front start up.Note: Wait until the indicator illuminates (approximately two minutes ) before proceeding to Step 6;otherwise, power to the load may be lost.4. Switch the UPS input and battery circuit breakers to the ON position.5. If present, switch the UPS output circuit breaker to the ON position6. Turn the maintenance bypass switch to the UPS position to return to Normal mode.7. Verify the rear fan is running.The UPS is now powering the load.8. Replace the UPS front door.