MBM OPERATING INSTRUCTIONSEaton 9395 Maintenance Bypass Module Installation and Operation Manual 164201719 Rev 3 www.eaton.com/powerquality6-66.3 MBM Operation – Electrical Interlock6.3.1 Transferring the UPS to Maintenance BypassC A U T I O NOnly trained personnel familiar with the operation of this equipment should transfer loads. Failure to followthis transfer sequence may cause loss of power to loads or overload protection devices to activate.C A U T I O NIn Bypass mode, the critical load is not protected from commercial power interruptions and abnormalities.1. Verify the BIB and RIB (if installed) are closed.2. Transfer the UPS to Bypass mode. Refer to the instructions in the operationchapter of the applicable Eaton 9395 UPS Installation and Operation manuallisted in paragraph 1.7 on page 1-4.W A R N I N GPower is present inside the cabinets.C A U T I O NFailure to close the MBP before opening the MIS will result in the loss of power to the critical load.3. Unfasten the MBM front door latch and swing the door open.NOTE If the UPS is not in Bypass mode, the MBP will trip when an attempt is made to close it.4. Close the MBP.5. Open the MIS.The critical load is supplied by the maintenance bypass source.6. Shut down the UPS. Refer to the instructions in the operation chapter of theapplicable Eaton 9395 UPS Installation and Operation manual listed in paragraph1.7 on page 1-4.C A U T I O NThe BIB and RIB must be opened to electrically isolate the UPS.7. Open the BIB and RIB if installed.8. Close the front door and secure the latch.
