Liebert 30-130kVA manual External maintenance bypass switch, single-input UPS

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Operation

Figure 28 External maintenance bypass switch, single-input UPS

S1-B

UPS Input	Critical load

S1-A

S1-C

IMBS

SBS

Rect INV

Battery

The table below summarizes the External Maintenance Bypass switch positions and actions.

Table 3	External maintenance bypass switch positions and actions

Switch position		S1-A	S1-B	S1-C	AUX

Maintenance (Service)		Open	Closed	Open	Open

Test (Bypass)		Closed	Closed	Open	Open

On Line (Transition)		Closed	Closed	Closed	Open

On Line (Normal)		Closed	Open	Closed	Closed

When the External Maintenance Bypass switch is in Bypass or Maintenance position, the UPSC will assert the bypass contactor close signal and the output contactor open signal. It will also turn on the SBS. Automatic Retransfer operations will be disabled.

If the External Maintenance Bypass switch rotates from the Bypass or Maintenance to the Normal position, then the UPSC will keep the bypass in the ON state, thus keeping the critical bus powered via the bypass source. The user will be able to issue a “Manual Transfer to Inverter” command pro- vided the retransfer conditions are satisfied. The user can also issue a shutdown or a start command.

If the External Maintenance Bypass switch rotates from the Normal to the Bypass or Maintenance position, the UPSC will assert the bypass contactor close signal and the output contactor open signal. It will also turn on the SBS. Automatic Retransfer operations will be disabled.

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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 Versatility Safety PrecautionsFactory Backup and Service Assistance ReliabilityRecharge Input Power FailureModes Of Operation Normal Load On UPSMimic Display CHGSYS. Status Options Operator ControlsBattery System General Component DescriptionUPS Module Detailed Component Descriptions Controls HardwareFirmware Operation Input Power FactorBattery Charging Circuit Rectifier/ChargerOperation After End-of-discharge Battery DisconnectBattery Charge Current Limiting Battery Equalize Charge CircuitStatic Switch Backfeed Protection Nonlinear Load CharacteristicsUnbalanced Load Characteristics Static Bypass SwitchTransfer and Retransfer Conditions Operation Operation Navigation Buttons Operator Control PanelRotary switch Rotary SwitchPrev Cancel Save & Exit ConfigurationUser Settings Security Access and PasswordsMenu Tree Display Screens and ProceduresSecondary Screens Primary ScreensMimic Display Screen Main Menu ScreenDischg FaultsFaults / Alarms RectSYS. Status Mimic DisplayTemps DEG C Inlet AIR Outlet AIR Heat Sinks DC BUS / Battery StatusInput Status FreqFreq .9 HZ 213 214 Phase Diff Bypass Input StatusOutput Load Status EXI T Active Faults and AlarmsFaults and Alarms User ShutdownNext System RatingsManual Startup Second ScenarioAuto Startup Skip Abort Input Modify Current Limit Target and Ramp ValuesModify DC BUS SET Point Target and Ramp Values ServExternal 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 ShutdownStatus Reports Status ReportsSystem Status History LOG Clear History Logs Clear Event LOGEvent LOG TotalEvent Log Output History LOG02 / 10 OUT-V IN-V Load FreqInput of / UF SBS Line Trap SBS LoadExit Configuration ScreensPrev DC BUS VoltsInput Frequency Output FrequencyCurrent Date System SettingsCancel Save & Exit System SettingsTime Next PREV. Cancel Save & ExitCurrent Time Order NumberOutput Transformer Bypass WIND. no Enter PasswordSingle / Dual Input DualOptions 10% Passive Filter SettingsOptions Active Filter LBS Generator Auto RestartPrev Exit Pulse Rectifier Battery GND Fault Green MachineAlternate Power Pole FAN no Line Drop CompensationCommunication Options Auto DialNext Exit Auto Dial YES Auto Dial OUT Pager Pager Support ConfigurationPager Enabled Pager Number Pager PIN Modem Health CheckPREV. Cancel Next PREV. Cancel 10 % Passive Filter Settings Factory SettingsNext Cancel Freeze Alarm MaskLatching DialSave & Exit Cancel Alarm / Fault NameAlarm / Fault Name Battery Fuse Fail Alarm / Fault Name F EAuto Dial Customer Alarm InterfaceCustomer Alarm Interface Programmable Output Relay Board #Remote LED Board # Relay Assignments STD SET User DefinedSTD SET UP Down ADD Remove Clear Exit Prog Relay #Manual Transfer Navigating ProtocolBattery Test Battery ManagementAuto Test MIN MAX Weeks Battery CycleBattery Duration Battery EqualizerStop Start Enabled DisabledAuto ManualEqualize Time Period Battery Temp Compensation ChargeTemperature Battery Temperature Compensation ChargeBattery Cycle Monitor Battery Temp CompensationBattery Cycle Monitor Summary Clear BCMClear Summary YES / no Seconds Discharge Cycles SummaryTime Down BATT. EOD Lower SET Point BATT. EOD Upper SET Point Battery Time Low WarningBattery Supplement BATT. Time LOW WarningAuto Restart Auto Restart Trigger Condition Alarm NotificationsSystem Status Monitoring System StatusSign OFF Date 10/30/02 System StatusSign OFF Date 10/30/01 Next Prev Save & ExitAccumulated # of Brown Outs Accumulated Backup HoursAccumulated Operating Hours on UPS Accumulated Operating Hours on BypassFaults Faults, Alarms, StatusDescription L Latching...D Dial Alarm / Fault Name F E DelayOn Battery Input Contact #1 UP DownSummary 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 Interfaces1 RS-232 Port Local Reporting Terminal Worldwide ReportingAuto-Dial Dial Out Pager Requesting InformationSiteScan Remote Alarm Status PanelSetting Up External Communication Devices Load on BypassOK to Transfer Momentary Overloads Input Power Failure Load on BatteryAutomatic Re-transfers to UPS Automatic OperationsOverloads Automatic Transfers to BypassAutomatic Module Off Line Maintenance Air Filters Routine MaintenanceBattery Maintenance Record LogBattery Safety Precautions Torque Requirements Battery voltage recordRecommended Test Equipment Reporting a ProblemDetecting Trouble Corrective ActionsMaintenance 101 Maintenance 102 Page Ne t