Specifications

Section-3 Operation
November 11, 2013
3‐24
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3.9.3.1.2 SystemThresholds
TheSystemThresholdsscreenisusedtosetthevariousRFlevelswhichwillgenerateawarningorfault.
Figure 3-27 System Thresholds Screen
Table3‐11TCUHome>Syste m>Service>Setup>Thresholds
Field Explanation
FoldbackPower
Thisisthesystemreflectedpowerlevelwhichcausespowerfoldbacktostart.Themaximumvaluethat
canbeenteredhereis2.78%ofnominalpower.
Note:Whensetto2.78%foldbackstartswhenthesystemVSWRreachesalevelof1.4:1.
FwdLowPowerFlt Thisisthesystemlowforwardpowerlevelwhichcausesafault.
FwdLowPwrWarn Thisisthesystemlowforwardpowerlevelwhichcausesawarning.
FwdHighPwrFlt Thisisthesystemhighforwardpowerlevelwhichcausesafault.
ExcPowMeters Thisshowstheoutputpoweroftheexciters.
RefPowerMeter
Thisshowsthesystemreflectedpower.Thisreadingresultsfromthesystemreflecteddetectorvoltage
valueindicatedincolumn3.
ExcALowPwrTrip ThisistheExciterAlowRFoutputdetectorvoltagelevelwhichcausesatrip.
ExcBLowPwrTrip ThisistheExciterBlowRFoutputdetectorvoltagelevelwhichcausesatrip.
RefPwrTrip
ThisisthereflectedoutputdetectorvoltagelevelwhichcausesaSystemVSWRfault.Whenthedetector
voltagereachesthetripvoltageaSystemVSWRfaultoccurs.ThesystemVSWRfaulttrippointoccursata
VSWRof1.9:1,whichequalsareflectedpowerlevelof9.6%ofthesystemnominalforwardpower
setting.
DetectorVoltage Columndisplaystheexciterandthereflectedpowerdetectoroutputvoltages.
ToFigure3‐25