GV60 TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
PAGE 4.1.18
VERSION 1.0 2018-01-01
Controller: Residual
PA Volts Present
(Residual PA V Pres)
Exciter (red)
This alarm indicates that after the transmitter has turned off its RF output, it
is unable to discharge the PA volts to a level that is below 10 V. This
condition will not allow the transmitter to turn on its RF output; however
the condition will be cleared once the PA volts reaches a level that is below
10 V. This condition will typically occur with a failed PA or power supply
module. Check for associated alarms and follow the associated
troubleshooting procedure.
Controller: RF
Spectrum Mask
Foldback
Output Network
(amber)
This alarm occurs if the HD optimizer has decreased the transmitter’s RF
output power to ensure the spectrum passes the mask. Typically caused by
a degrading load impedance, PA or PS failures.
Controller: SC1
Interlock
Exciter (red)
This alarm occurs, for combined systems only, if the system controller (SC1)
has inhibited the transmitter’s RF output due to a system interlock fault. See
the SC1 Technical Instruction Manual for more information.
Controller: Splitter
Fan 1/2 Fail
Output Network
(amber)
This alarm occurs if the splitter’s fan 1/2 (B7 in Cabinet A/B107 in Cabinet B)
speed is too low. This alarm occurs if the RF drive splitter’s cooling fan has
been enabled, but the fan tachometer measurement is below 2000 RPM.
The fan will be enabled if an RF power module is removed, or the splitter
reject power exceeds 100 W. Inspect the fan and, if necessary, replace it
(see
“Cooling Fan Replacement” on page 4.1.56
).
Controller: Standby
Exciter Test (Standby
Exc Test)
Exciter (amber)
This alarm occurs when a standby exciter test has been initiated by the user.
Exciter changeovers are inhibited during a standby exciter test.
Controller: SWR
Foldback
Output Network
(amber)
This alarm occurs if the transmitter's average reflected power exceeds the
SWR foldback threshold (2400
W for all modes) due to a gradually
degrading load match. The forward power of the transmitter will be limited
to a level such that this threshold is not exceeded. If the load match
improves while the transmitter is producing RF output, the forward power
will increase. If the transmitter encounters a 3:1 VSWR (user-configurable)
while in SWR foldback mode, an SWR Shutdown alarm occurs. Inspect the
antenna and transmission line system for damage or de-tuning.
Device and
Alarm Name
(AUI, UI)
Controller Front
Panel LED (color)
Description and Troubleshooting Action
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