Emerson 250-400kVA manual Detecting Trouble, Rack-Mounted Batteries, Torque Requirements

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Maintenance

Rack-Mounted Batteries

If the UPS system uses a battery other than a factory-supplied Matching Battery Cabinet, perform maintenance on the battery as recommended in the battery manufacturer’s maintenance manual, available on the manufacturer’s Web site.

3.4.2Torque Requirements

All electrical connections must be tight. Table 4 provides the torque values for the connections in the UPS. Use these values unless the equipment is labeled otherwise.

NOTE

Refer to the battery manufacturer’s manual, available on the manufacturer’s Web site, for the proper torque values required for the battery.

Table 4	Torque specifications, unless otherwise labeled

	Nut and Bolt Combinations

			Electrical Connections
		Grade 2 Standard	with Belleville Washers
Bolt Shaft Size		lb-in (Nm)	lb-in (Nm)
	1/4	53 (6.0)	46 (5.2)

	5/16	107 (12)	60 (6.8)

	3/8	192 (22)	95 (11)

	1/2	428 (48)	256 (29)

Circuit Breakers with Compression Lugs (For Power Wiring)

Current Rating		lb-in (N-m)	—

400 - 1200 Amps		300 (34)	—

Circuit Breakers with Compression Lugs (For Control Wiring)

AWG Wire Size or Range		lb-in (N-m)	—

	#22 - #14	3.5 to 5.3 (0.4 to 0.6)	—

3.5Detecting Trouble

It is important that the operator check the instrument readings if abnormal equipment performance is suspected. Any metered value that differs appreciably from normal could mean an impending mal- function and should be investigated.

Items to check include:

•If the UPS has not operated on battery power during the last 10 hours, the batteries should require little charging current. Battery mimic should indicate normal DC voltage with the battery charge current no more than 1% of maximum discharge current.

•Input current on each phase should be within 10% of the average input current.

•Alarm messages indicate malfunction or impending malfunction. A daily check of the Display Screen will help to provide an early detection of problems. Refer to Table 7 for information about interpreting alarm messages.

•Tracing a problem to a particular section is facilitated by alarm messages and the metered parameter indications.

NOTICE

If the UPS system has an open fuse, the cause should be determined before replacing the fuse. Contact Liebert Services for assistance.

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Contents Liebert NXL Contacting Liebert for Support Battery Cabinet PrecautionsTable of Contents Specifications Figures Page Important Safety Instructions General Description Normal ModeModes of Operation Options Bypass ModeBattery Mode Maintenance BypassIntroduction 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 Status Reports Menu Event ManagementStartup Menu Shutdown menu Shutdown MenuTransfer Menu Transfer/retransfer commandsTime remaining display Battery Management MenuDisplay summary see Figure Silence ResetMetering HelpLoad 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 Maintenance Bypass Load Transfers Load Transfer ProceduresTransfer Procedure Re-Transfer ProcedureMaintenance Bypass Load Transfers-If Load is on UPS Bypass Automatic Operations Shutdown ProceduresUPS Shutdown Procedure System Shutdown ProcedureCurrent-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 LogComponent Expected Life Replace Battery MaintenanceUPS component service life Limited Life ComponentsBattery Safety Precautions Battery voltage, nominal and float Matching Battery Cabinets-OptionalBattery retorque values Torque Requirements Torque specifications, unless otherwise labeledDetecting Trouble Rack-Mounted BatteriesUpstream Feeder Circuit Breaker Setting Inspections Reporting a ProblemCorrective Actions Environmental Conditions Battery OperationEnvironmental specifications Parameter SpecificationInput Parameters Electrical specificationsBattery & DC Parameters Liebert NXL Model Size 250System Parameter Liebert NXL Model SizePhysical 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 That Ne tIti Ti n