Liebert 30-130kVA manual Momentary Overloads, Input Power Failure Load on Battery

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Operation

Figure 113Load on bypass (UPS available and battery charging)

MIMIC DISPLAY
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RECT.	INV.	LOAD

BATTERY								FAULTS / ALARMS

CHARGE

3.6.3Momentary Overloads

An overload in the critical load will continue to be supplied by the UPS system if the overload condi- tion does not exceed the current versus time curve of overload capacity for the UPS.

For momentary overloads exceeding 200% of rated system current, the static switch turns on for 10 cycles. This provides current from the bypass line in parallel with current from the UPS system out- put. By providing two power sources simultaneously, high current can be supplied to the critical load with full output voltage regulation. The critical load can be sustained through inrush currents and momentary faults.

If an overload situation exceeds 10 cycles, the UPS module continues to supply power to the critical load if it remains within the current-versus-time curve of overload capacity. If the system overload capacity is exceeded, the UPS control logic initiates an automatic transfer to the bypass line by oper- ating the static bypass switch and the contactors (output and bypass).

3.6.4Input Power Failure (Load on Battery)

If the utility AC power source fails, or is outside the acceptable range, the battery plant becomes the power source for the UPS module inverter. The UPS system continues to supply power to the critical load, and also to the UPS controls.

You can use the Battery Time screen at the UPS modules to monitor the present battery voltage com- pared to the shutdown value. The length of time the battery can sustain the load depends on the size of the load and the size and condition of the battery plant. The battery plant is typically large enough to supply a 100% rated load for 15 minutes.

Alarm messages that indicate battery status are Battery Discharge, Low Battery, and Battery Shut- down. The voltage limits for these alarms are displayed on the UPS module Alarm Limit Settings screen. These limits were selected for your installation by Liebert Global Services during initial start- up.

Figure 114Utility fail, load on battery

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RECT.

BATTERY

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FAULTS

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Contents Npower UPS Page Table of Contents Communication Interfaces MaintenanceFigures Page Tables Page Important Safety Instructions Overview of Manual System Description Factory Backup and Service Assistance Safety PrecautionsReliability VersatilityModes Of Operation Input Power FailureNormal Load On UPS RechargeSYS. Status Mimic DisplayCHG Options Operator ControlsUPS Module Battery SystemGeneral Component Description Firmware Detailed Component DescriptionsControls Hardware Battery Charging Circuit Input Power FactorRectifier/Charger OperationBattery Charge Current Limiting Battery DisconnectBattery Equalize Charge Circuit Operation After End-of-dischargeUnbalanced Load Characteristics Nonlinear Load CharacteristicsStatic Bypass Switch Static Switch Backfeed ProtectionTransfer and Retransfer Conditions Operation Operation Navigation Buttons Operator Control PanelRotary switch Rotary SwitchUser Settings ConfigurationSecurity Access and Passwords Prev Cancel Save & ExitMenu Tree Display Screens and ProceduresSecondary Screens Primary ScreensMimic Display Screen Main Menu ScreenFaults / Alarms FaultsRect DischgSYS. Status Mimic DisplayInput Status DC BUS / Battery StatusFreq Temps DEG C Inlet AIR Outlet AIR Heat SinksOutput Load Status Freq .9 HZ 213 214 Phase DiffBypass Input Status Faults and Alarms Active Faults and AlarmsUser Shutdown EXI TNext System RatingsAuto Startup Manual StartupSecond Scenario Modify DC BUS SET Point Target and Ramp Values Input Modify Current Limit Target and Ramp ValuesServ Skip AbortExternal maintenance bypass switch, dual-input UPS SIB External Maintenance BypassExternal maintenance bypass switch, single-input UPS External Maintenance Bypass Switch Configurations Multiple Battery CabinetsShutdown User ShutdownSystem Status Status ReportsHistory LOG Clear History Logs Clear Event LOG Status ReportsEvent Log Event LOGTotal 02 / 10 History LOGOUT-V IN-V Load Freq OutputInput of / UF SBS Line Trap SBS LoadExit Configuration ScreensInput Frequency DC BUS VoltsOutput Frequency PrevCancel Save & Exit System SettingsSystem Settings Current DateCurrent Time Next PREV. Cancel Save & ExitOrder Number TimeSingle / Dual Input Enter PasswordDual Output Transformer Bypass WIND. noOptions 10% Passive Filter SettingsActive Filter LBS Generator Auto Restart OptionsAlternate Power Pole FAN no Pulse Rectifier Battery GND Fault Green MachineLine Drop Compensation Prev ExitNext Exit Communication OptionsAuto Dial Pager Enabled Pager Number Pager PIN Pager Support ConfigurationModem Health Check Auto Dial YES Auto Dial OUT PagerPREV. Cancel Next PREV. Cancel Next Cancel 10 % Passive Filter SettingsFactory Settings Latching Alarm MaskDial FreezeAlarm / Fault Name Battery Fuse Fail Alarm / Fault NameAlarm / Fault Name F E Save & Exit CancelAuto Dial Customer Alarm InterfaceRemote LED Board # Customer Alarm InterfaceProgrammable Output Relay Board # STD SET Relay AssignmentsSTD SET User Defined UP Down ADD Remove Clear Exit Prog Relay #Manual Transfer Navigating ProtocolBattery Test Battery ManagementAuto Test Battery Duration Battery CycleBattery Equalizer MIN MAX WeeksAuto Enabled DisabledManual Stop StartTemperature Battery Temp Compensation ChargeBattery Temperature Compensation Charge Equalize Time PeriodBattery Cycle Monitor Battery Temp CompensationClear Summary YES / no Battery Cycle MonitorSummary Clear BCM Time Down Seconds Discharge CyclesSummary BATT. EOD Lower SET Point BATT. EOD Upper SET Point Battery Time Low WarningAuto Restart Battery SupplementBATT. Time LOW Warning Auto Restart Trigger Condition Alarm NotificationsSystem Status Monitoring System StatusSign OFF Date 10/30/01 System StatusNext Prev Save & Exit Sign OFF Date 10/30/02Accumulated Operating Hours on UPS Accumulated Backup HoursAccumulated Operating Hours on Bypass Accumulated # of Brown OutsFaults Faults, Alarms, StatusOn Battery Input Contact #1 Alarm / Fault Name F E DelayUP Down Description L Latching...D DialSummary Alarms, functions, and corrective actions Alarm MessagesContact Liebert Global Service to check Excess load from the UPS and attempt to EPO Maximum heat sink temperature limit This is a summary event based on Battery is discharging. This occurs RMS input current has reached Output kVA or kW or RMS current has With the load on UPS, PhaseB output KVA Condition only causes an alarm, but should Push-button switch located on See 3.3.7 Battery Management All of the alarms before attempting to Status Communication InterfacesAuto-Dial 1 RS-232 Port Local Reporting TerminalWorldwide Reporting Dial Out Pager Requesting InformationSiteScan Remote Alarm Status PanelOK to Transfer Setting Up External Communication DevicesLoad on Bypass Momentary Overloads Input Power Failure Load on BatteryOverloads Automatic OperationsAutomatic Transfers to Bypass Automatic Re-transfers to UPSAutomatic Module Off Line Maintenance Battery Maintenance Routine MaintenanceRecord Log Air FiltersBattery Safety Precautions Torque Requirements Battery voltage recordDetecting Trouble Reporting a ProblemCorrective Actions Recommended Test EquipmentMaintenance 101 Maintenance 102 Page Ne t