Powerware 9315 operation manual Path of Current Through the UPS in Bypass Mode

Page 19

Bypass Mode

The UPS automatically switches to Bypass mode if it detects an overload, load fault, or internal failure. The bypass source supplies the commercial AC power to the load directly.

CAUTION:

The critical load is not protected while the UPS is in Bypass mode.

Figure 4 shows the path of electrical power through the UPS system when the UPS is operating in Bypass mode.

BYPASS

Bypass

 

 

Input

 

 

 

 

K4

 

RECTIFIER

INVERTER

Rectifier

CB1

 

 

 

Input

 

 

K3 Output

(open)

TRANSFORMER

BATTERY

Path of electrical power

Figure 4. Path of Current Through the UPS in Bypass Mode

You can transfer the UPS from Normal mode to Bypass mode manually. However, the UPS switches automatically to Bypass mode whenever the inverter can no longer supply the critical load. If the UPS transfers to Bypass mode from Normal mode due to any reason other than operator intervention, the UPS automatically attempts to transfer back to Normal mode (up to three times within a 10-minute period). The fourth transfer will lock the critical load on the bypass source and requires operator intervention to transfer.

Bypass mode is a normal operating mode, and not an alarm condition. However, if the UPS is unable to return to Normal mode following an automatic transfer to Bypass mode, an alarm condition will be recorded.

Powerware 9315 (200 kVA ---300 kVA) Operation

11

164201036 Rev. D 041500

 

Image 19
Contents Uninterruptible Power Supply KVA 300 kVA Important Safety Instructions Table of Contents Starting and Stopping the UPS Maintaining the UPS System Responding to System Events List of Figures List of Tables Introduction Using This ManualGetting Help For More InformationGetting Started Typical Powerware 9315 UPS SystemLooking Inside the UPS Battery CabinetMonitor Panel UPS Standard FeaturesInstallation Features Options and AccessoriesOutput Transformer Safety ConsiderationsRisk of Electric Shock Symbols, Controls, and IndicatorsUnderstanding UPS Operation Path of Current Through the UPS in Normal Mode Normal ModePath of Current Through the UPS in Bypass Mode Bypass ModePath of Current Through the UPS in Battery Mode Battery ModeControl Panel Monitor Monitoring and Controlling UPS OperationThis Page Intentionally Left Blank Starting and Stopping the UPS Using the Control PanelTo Place the UPS in Normal Mode To Start the UPS in Bypass Mode To Shut Down the UPS from Normal ModeThis Page Intentionally Left Blank UPS Monitor Panel Using the Monitor PanelAlarm None Using the LCD ScreenAdjusting the Contrast Using the PushbuttonsUsing the Load Off Pushbutton Reading the Status Indicators · Setup Using the Menu OptionsShows the Load Amps Meters screen Shows the Event History Log screen Shows the Active System Events screen Shows the Unit Statistics screen Shows the Mimic screen Time Setup Screen Port Setup Screen Building Alarm Monitoring Using Features and OptionsSummary Alarm Contacts Summary Alarm ContactsRemote Monitor Panel Optional Monitoring AccessoriesSystem Normal External Battery Disconnect Battery CabinetsRelay Interface Module Relay Interface ModuleShutdown Imminent Supervisory Contact ModuleThis Page Intentionally Left Blank Serial Communications Communications Panel Locating the Communications PanelPort 1 DE-9 Connecting Equipment to a Serial PortPort 2 DB-25 Setup Serial Port 1 Screen Configuring the Serial PortsRate ModeSave Default SettingsData/Stop HandshakingPrinting Selected Information Terminal ModeEvent History Log Entire Log Ctrl + PSystem Information Printout Ctrl + a Meters Printout Ctrl + MAPR Battery Test Printout Ctrl + BSystem Configuration Mode Main Menu System ConfigurationProgram Building Alarms Enable/Disable Default Functions Program Unit Name Customize Alarm MessagesChange Password Adjust Output VoltageWK DAY MON Hrmn 4 FRI MAR Battery Test SetupModify Low Battery Time Calibration ModeComputer Mode Remote Monitor ModeThis Page Intentionally Left Blank Remote Notification Remote Notification Features Call Answer Description of OperationCall Out Housekeeping Hardware Requirements Basic Modem Configuration Configuring the ModemConfiguring the Modem to Call a Remote Computer Configuring the Modem to Call a Numeric Pager Configuring the Modem to Answer Incoming Calls Final Modem Configuration Save UPS Setup ConfigurationUser-Selected Events Messages AlarmsRectifier Monitor Maintaining the UPS System Important Safety Instructions164201036 Rev. D Maintenance Training Performing Preventive MaintenanceThis Page Intentionally Left Blank System Input Product SpecificationsNominal +/-- 5% System OutputBattery Specifications Environmental SpecificationsThis Page Intentionally Left Blank System Event Horns Responding to System EventsSystem Event Lights System Event Messages Inverter Messages -- Alarms Inverter Messages -- NoticesInverter Messages Inverter Status Messages Commands Rectifier Status Messages Resetting the UPS System after Load Off Using the Load OFF PushbuttonTo Use the Load OFF Pushbutton This Page Intentionally Left Blank