Emerson 250-400kVA manual Maintenance Bypass Load Transfers-If Load is on UPS Bypass

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Operation

NOTICE

Risk of equipment damage. The UPS system must be on internal bypass before performing the following procedures and operating MIB or MBB, or damage to the UPS may occur and the critical load may be lost.

Maintenance Bypass Load Transfers—If Load is on UPS Bypass

1.If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, press the button on the maintenance bypass cabinet to remove the key from the solenoid.

NOTE

If the maintenance bypass cabinet or switchboard has any other type of custom interlock, follow the specific instructions for that interlock system to remove the key.

2.If using a key interlock system, insert the key into the lock for the Maintenance Bypass Breaker (MBB) to enable it to be closed.

3.Close the Maintenance Bypass Breaker (MBB).

4.Open the Maintenance Isolation Breaker (MIB). The UPS system is now isolated from the critical load, and the load is now on Maintenance Bypass.

5.If using a key interlock system, remove the key from the lock for the Maintenance Isolation Breaker (MIB) to lock it open.

6.If the maintenance bypass cabinet or switchboard has an optional 2-key interlock system, replace the key into the solenoid.

7.If UPS bypass shutdown is required, open the Bypass Input Breaker (BIB).

Maintenance Bypass Load Transfers—If Load is on Maintenance Bypass

1.Close the Bypass Input Breaker (BIB) or verify BIB is closed. Note that UPS Bypass circuit breaker (motorized) must also be closed. Refer to 2.4.1 - Startup Procedure.

2.If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, press the button on the maintenance bypass cabinet to remove the key from the solenoid.

NOTE

If the maintenance bypass cabinet or switchboard has any other type of custom interlock, follow the specific instructions for that interlock system to remove the key.

3.If using a key interlock system, insert the key into the lock for the Maintenance Isolation Breaker (MIB) to enable it to be closed.

4.Close the Maintenance Isolation Breaker (MIB).

5.Open the Maintenance Bypass Breaker (MBB). Load is now on UPS Internal Bypass.

6.If using a key interlock system, remove the key from the lock for the Maintenance Bypass Breaker (MBB) to lock it open.

7.If the maintenance bypass cabinet or switchboard has an optional 2-key interlock system, replace the key into the solenoid.

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Contents Liebert NXL Contacting Liebert for Support Battery Cabinet PrecautionsTable of Contents Specifications Figures Page Important Safety Instructions Normal Mode General DescriptionModes of Operation Battery Mode Bypass ModeMaintenance Bypass OptionsIntroduction Main component locations FeaturesMimic display Monitor/mimic display example Utility fail Monitor/mimic display example Normal power flowMonitor/mimic display example Load on bypass, UPS On Menu tree Touchscreen Navigation Main Display ScreenRating Parameters Configurations Menu RatingSystem Settings parameters User SettingsAdjustable setpoints parameters Adjustable SetpointsCell Count Adjustment Event Management Status Reports MenuStartup Menu Shutdown menu Shutdown MenuTransfer Menu Transfer/retransfer commandsTime remaining display Battery Management MenuDisplay summary see Figure Metering ResetHelp SilenceLoad on bypass, UPS available OK to TransferInput power fail, load on battery Input Power Failure-Load on BatteryEmergency Module Off Off BatteryRemote Emergency Power Off Manual ProceduresStartup Procedure Startup commands Transfer Procedure Load Transfer ProceduresRe-Transfer Procedure Maintenance Bypass Load TransfersMaintenance Bypass Load Transfers-If Load is on UPS Bypass UPS Shutdown Procedure Shutdown ProceduresSystem Shutdown Procedure Automatic OperationsCurrent-versus-time curves of overload capacity Automatic Transfers to Bypass Overload ConditionAutomatic Retransfers to UPS Automatic Transfers to Bypass, UPS System FaultsSafety Precautions Routine Maintenance Liebert ServicesAir Filters Record LogUPS component service life Battery MaintenanceLimited Life Components Component Expected Life ReplaceBattery Safety Precautions Matching Battery Cabinets-Optional Battery voltage, nominal and floatBattery retorque values Detecting Trouble Torque specifications, unless otherwise labeledRack-Mounted Batteries Torque RequirementsReporting a Problem Upstream Feeder Circuit Breaker Setting InspectionsCorrective Actions Environmental specifications Battery OperationParameter Specification Environmental ConditionsBattery & DC Parameters Electrical specificationsLiebert NXL Model Size 250 Input ParametersLiebert NXL Model Size System ParameterPhysical Parameters & Standards, in mm Specifications Event Message Event Definition Recommended Action Liebert NXL alarm and status messagesObserve the One-Line Display. If the input line is Observe the One-Line Display. To identify which Do not Attempt to Close CB3 Until Reset Displayed on the Module Output Meter. If UPS controls monitor the DC Bus positive Resolve the issue that precipitated the EPO Check the One-Line Display for system status UPS, to transfer back to Inverter If this alarm occurs on an operational unit, it Attempt to manually close the disconnect by Module Output Meter. If the load is less than Output Power Factor. If the displayed power factor Until a service visit has been made and action taken When manual transfers are enabled Under normal conditions, no user action is required Observe the One-Line Display and the Active Event If the command to terminate Regeneration Mode If the alarm cannot be reset, or if the alarm condition UPS Alarm and Status Messages UPS Alarm and Status Messages Page Iti Ne tTi n That