Owner`s manual

Facility Circuit
Facility Circuit
PDUMH30AT
Critical Equipment
Loads
SecondaryUPS
PrimaryUPS
PrimaryInputCord
Secondary Input Cord
UtilityB
UtilityA
16
Configuration and Operation
Automatic Transfer Switch
WhenthePrimaryandSecondaryinputsarebothconnectedtoTrippLiteUPS
Systems,thePDUoperatesasanAutomaticTransferSwitch,providingredundant
inputpowerforhighavailabilityapplications.Undernormaloperatingconditions,the
PDUwilldistributepowerfromthePrimaryinputsource,switchingtotheSecondary
inputsourceundercertainconditions.ThePDUwillswitchtothePrimarysource
wheneveritisGoodaccordingtothePDUinputvoltagedefinitions(seebelow).
Preferred Configuration
The Automatic Transfer Switch function
provides increased availability when the
PrimaryandSecondaryinputsofthe
PDUareconnectedtoseparate
TrippLiteUPSSystemsthatare
connected to separate utility power
sources.Formaximumavailability,
Tripp Lite recommends using matching
SmartOnlineUPSSystemswithpure
sinewaveoutputforthePrimaryand
Secondary input power sources. The
automatic transfer switch function will
be compromised if the primary and
secondary inputs are connected to the
same utility power source.
Warning: DO NOT connect the primary input to a line-interactive UPS, due to
transfer time issues, or to any source that does not supply a pure sine wave.
Such sources may be used to power the secondary input.
Automatic Transfer Switch Source Selection
ThePDUwillpowerupifoneoftheinputsourcesisgreaterthantheminimum
startupvoltage.Innormaloperation(afterpower-up),ifthepresentlyselectedsource
(primaryorsecondary)degradestoalessercondition,theunitshouldswitchtothe
alternatesource,ifthatsourceisofbetterquality.Theunitpreferstheprimary
source,andwillalwaysswitchtoitintheeventthatbothsourcesareofthesame
(fairorgood)quality.Ifthepresentsourceisbecomingbadandthealternatesource
isatleastfair,theunitwillswitchtothealternatesource.
PDU Power Source Selection Parameters
PDUMH30AT&
PDUMH30ATNET
PDUMH30HVAT&
PDUMH30HVATNET
Nominal Voltage 120V 208V
Minimum Startup Voltage 85V 163V
“Good”VoltageRange 99-139V 172-241V
“Fair”VoltageRange 75-98V 144-171V
“Bad”VoltageRange 0-74V 0-143V
13-04-262-93323D-EN.indd 16 5/10/2013 3:02:52 PM