UPS OPERATING INSTRUCTIONSEaton 9390 UPS (100–160 kVA) Installation and Operation Manual 164201604 Rev E www.eaton.com/powerquality9-149.2.4 Transfer Parallel System from Bypass to Normal ModeTo transfer the critical load to Normal mode:1. Press the CONTROLS pushbutton on the main menu bar on any UPM. The SystemControl screen appears.2. Press the NORMAL pushbutton on the System Controls menu bar of any UPM.The UPMs transfer to Normal mode. If the power processor is not available, thesystem remains on bypass and an alarm sounds.3. The UPMs are now operating in Normal mode, and the NORMAL status indicatoron each UPM is illuminated.The power module (PM) status indicates ONLINE on each UPM.9.2.5 Single UPM ShutdownTo shut down a single UPM:NOTE The UPM can be shut down only if remaining UPMs can support the critical load without beingoverloaded.1. Press the CONTROLS pushbutton on the main menu bar on the UPM to be shutdown. The System Controls screen appears.2. Press the pushbutton to display System Controls Screen 2.3. Press the PM OFF pushbutton on the System Controls menu bar.The power module (PM) status indicates SHUTDOWN. The input and outputcontactors open, the battery breaker or disconnect is tripped, and the powermodule is turned off.4. Open the input and bypass (if dual feed) feeder circuit breakers supplying theshutdown UPM.NOTE The monitor screen continues to be active until the UPM is isolated from the critical bus.W A R N I N GPower is present inside the shutdown UPM cabinet due to connection to the critical bus, until the UPMoutput breaker is opened.5. If it is necessary to isolate the UPM from the critical bus, open the moduleoutput breaker on the tie cabinet or distribution panel.9.2.6 Restarting a Single UPMTo restart a single UPM:1. If the UPM was isolated from the critical bus, close the module output breakeron the tie cabinet or distribution panel.2. Observe the UPM control panel display becoming active, indicating logic power.UPM logic is being powered from the critical bus.
