American Power Conversion 250 A manual Open and closed transfers

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How the InfraStruXure Power Generation System Operates

Open and closed transfers

When transfers are not occurring, one switch is ON and one switch is OFF.

During a closed transfer, the second switch will turn ON before the first switch turns OFF, creating a brief period of time when both switches are ON.

Closed Transfer

Source 1

Source 1

Source 2

 

Source 2

 

 

t=miliseconds

 

During an open transfer, the first switch will turn OFF before the second switch turns ON, creating a period of time when neither source is connected. This period is commonly referred to as neutral time. Neutral time is defined by the configurable Open Xfer Time.

Open Transfer

Source 1

Neutral

Source 2

 

t=seconds

 

You can set whether or not to Allow Closed transfers under the Transfer Setup item on the ATS Setup menu on the display interface (see page 35 for details about these settings). If the Allow Closed setting is Yes, the ATS will always seek to perform closed transfers. In order for a closed transfer to occur, the voltage and frequency for both sources must be acceptable and both sources must be synchronized. The ATS monitors both sources for synchronization before transferring. If the time it takes for the sources to become synchronized exceeds the configured Max Sync Time, the ATS will perform an open transfer instead. During a closed transfer, the ATS also takes into account the time it takes for the switch to actuate. This results in a seamless transfer in which non-UPS- protected equipment is uninterrupted and the UPS time on battery is reduced or even eliminated.

If the Allow Closed setting is No, the ATS will never perform closed transfers; it will only perform open transfers (see page 35 for details about these settings).

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InfraStruXure Power Generation System

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Contents Operation Page Audience How to find updates to this manualAbout This Manual Companion manualsPage Contents Display Interface Communication Configuration Customizing and Updating the ATS Specifications Page Safety symbols used in this manual Cross-reference symbols used in this manualOverview Wire sizing Installation Total power off procedureOperating environment Page InfraStruXure Power Generation System OverviewHow the InfraStruXure Power Generation System OperatesGenerator start sequence Generator cool-downOpen and closed transfers Fuel monitoring/runtime calculation Page Smart Distribution Panel with ATS Front view, door closedFront view, door open  The automatic operation Control panel is used to setInstallation Manual for instructions ATS panel board, left sideATS panel board, right side Motorized switches ATS Component DetailsAutomatic operation control panel User connection plate When the EPO Arm/Test rocker is in the Test ATS monitoring unitATS label kit Operation Automatic OperationAutomatic Operation Problem-loss of automatic operation Emergency Manual Operation How to power the load from the generator Set the ATS Automatic Operation switch to DisableEmergency Manual Operation How to return to powering the load from utility Press Total Power Off Total Power Off Display Interface Top-level status screens Top-level menu screenPassword-protected screens Navigating through screensLoad-Meter Total Load by PhasePower Factor Total Load SummaryATS/Voltage ATS PositionS1-Utility S2-Generator ATS Setup ATS/Voltage Generator Generator StatusOperating Settings Gen Output AdjustManufacturer Data Testing View Test LogRun/View Test Test Schedule Test DurationHow a test occurs Reset Reset AllStats Alarm/Event Log AlarmsView Active Alarms Alarm SetupFuel Alarm Limits Alarm BeeperClearing latched alarms Other LimitsSystem/Network ConfigSystem Password Date/TimePage Firmware Updates Electrical ConfigFactory Defaults Reset 100% Fuel LevelPage InfraStruXure Manager ATS Management OptionsOverview Network management interfacesConfiguring the InfraStruXure Manager Connect the ATS to the InfraStruXure ManagerConfiguring the ATS Network Management Interface Connect the ATS to your networkConfiguration overview TCP/IP configuration methodsDevice IP Configuration Wizard Bootp & Dhcp configuration Option 43 = 01 04 31 41 50 43 where Local access to the control console Remote access to the control consoleControl console Choose Network from the Control Console menuHow to Access the ATS Network Management Interface Web interfaceTelnet and SSH SnmpFTP and SCP InfraStruXure Power Generation System Customizing and Updating the ATS How to connect contacts to the user interface board How to Connect an EPO Switch to the ATS EPO Test NC noContact Closure-Normally Open Problem Action Safety warnings How to Allow Easy Access to the ATS Display Interface Output distribution circuit breakers available from APC Part Number Description Height on PanelDetermine the configuration of the panel Circuit breaker adapter modules available from APCAllowed circuit breaker combinations Combination #1Combination #6 Preparing the breakers for installation T1 three-pole breaker requires no additional preparationParts and tools needed for installation procedures T1 three-pole breaker assemblyInstalling breakers on the ATS panel bus See also How to Download Firmware Updates From a local computerElectrical PhysicalInstallation and Wiring 208V 480V AWGEnvironmental CompliancePage Appendix Custom Installations If Source 2 is a Second UtilityInfraStruXure Power Generation System Index InfraStruXure Power Generation System InfraStruXure Power Generation System Page Page Page Radio Frequency Interference 990-1845C