Eaton Electrical Powerware 9315 Path of Current Through the UPS in Battery Mode

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Understanding UPS Operation

3.3 Battery Mode

The UPS transfers to Battery mode automatically if a utility power outage occurs, or if the utility power does not conform to specified parameters. In Battery mode, the battery provides emergency DC power that the inverter converts to AC power. When the UPS switches to Battery mode, the alarm indications depend on the cause and condition of the battery charge. The length of time the system can operate in Battery mode depends on load configuration and the battery charge.

Figure 3-3 shows the path of electrical power through the UPS when operating in Battery mode.

Bypass

Bypass

Input

K4

 

Rectifier

Inverter

Rectifier

CB1

 

 

 

Input

 

 

K3

Output

 

(Closed)

 

Transformer

 

Path of electrical power

Battery

Figure 3-3. Path of Current Through the UPS in Battery Mode

When the discharging battery voltage reaches the lower limit of UPS operation capability, the critical load transfers to Bypass mode if it is available. If Bypass input is not available, a “Shutdown Imminent” warning occurs. The warning time before critical load loss occurs is approximately two minutes, depending on load configuration and the battery charge.

If incoming power returns to within specified parameters, the UPS automatically returns to Normal mode and alarm indications clear. However, the process of returning to Normal mode is not instantaneous. The rectifier gradually draws increasing power from the incoming utility until Normal mode is achieved.

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EATON Powerware® 9315 UPS (200–300 kVA) Operation Manual S 164201036 Rev F powerware.com

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Contents Page Important Safety Instructions Table of Contents Starting and Stopping the UPS Maintaining the UPS System List of Figures Introduction Conventions Used in This ManualFor More Information Getting HelpSafety Warnings Getting StartedTypical Powerware 9315 UPS System Typical Powerware 9315 UPS SystemPower Processing Unit PPU Looking Inside the UPSUPS Standard Features Monitor PanelControl Panel Communication BaysOptions and Accessories Power Distribution Module LV models only Upgrade CapabilityRemote Monitor Panel Relay Interface ModuleCustomer Convenience Outlet Output TransformerModem Symbols, Controls, and Indicators Normal Mode Understanding UPS OperationPath of Current Through the UPS in Normal Mode Bypass Mode Path of Current Through the UPS in Bypass ModeBattery Mode Path of Current Through the UPS in Battery ModeMonitoring and Controlling UPS Operation Location of the Monitor Panel and the Control PanelThis page intentionally left blank Using the Control Panel Starting and Stopping the UPSTo Place the UPS in Normal Mode To Shut Down the UPS from Normal Mode To Start the UPS in Bypass ModeThis page intentionally left blank Using the Monitor Panel UPS Monitor PanelUsing the LCD Screen System Normal 04 MAY 142345 AlarmUsing the Load Off Button Using the ButtonsAdjusting the Contrast Reading the Status Indicators Using the Menu OptionsShows the Load Amps Meters screen Load Amps Meters Screen Event History Log Screen Active System Events Screen Unit Statistics Screen Mimic Screen Time Setup Screen 10. Setup Serial Port 1 Screen Using Features and Options Building Alarm MonitoringSummary Alarm Contacts Summary Alarm ContactsRemote Monitor Panel Remote Monitor PanelOptional Monitoring Accessories Battery Cabinets External Battery DisconnectRelay Interface Module UPS AvailableSupervisory Contact Module On GeneratorThis page intentionally left blank Communication Locating the Communication BaysLocation of Communication Bays on the UPS Powerware 9315 Slot CardsLanSafe Power Management Software Connecting Equipment to a Serial PortPin Assignments for Port 1 DB-9 Pin Assignments for Port 2 DB-25 Configuring the Serial Ports Setup Serial Port 1 ScreenMode RateDefault Settings Data/StopHandshaking SaveTerminal Mode Printing Selected InformationEntire Log Ctrl+P Event History LogMeters Printout Ctrl+M System MetersBattery Test Printout Ctrl+B System Information Printout Ctrl+AProgram Building Alarms System ConfigurationSystem Configuration Mode Main Menu Enable/Disable Default Functions Customize Alarm Messages Program Unit Name Adjust Output VoltageChange Password Battery Test Setup WK DAY MON HrmnCalibration Mode Computer ModeRemote Monitor Mode Modify Low Battery TimeRemote Notification This page intentionally left blank Important Safety Instructions Maintaining the UPS SystemPerforming Preventive Maintenance E R T I S S E M E N TMaintenance Training This page intentionally left blank Product Specifications Model NumbersSystem Output Battery Specifications This page intentionally left blank Responding to System Events System Event HornsSystem Event Lights System Event Messages10-2 Rectifier Messages Alarms Rectifier Messages Notices Monitor Panel Alarms Monitor Panel Notices Using the Load OFF Button Resetting the UPS System after Load Off Warranty Limited Factory Warranty for THREE-PHASE Powerware ProductsWarranty Page 164201036F