Nautel GV30N, Troubleshooting Manual

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GV30N TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
PAGE 4.1.12 VERSION 0.1 2014-11-01
Controller: High SWR Output Network
(amber)
This alarm occurs if the transmitter's average reflected power exceeds the
high SWR threshold (840 W). The GV30N takes no action on this alarm.
Inspect the antenna and transmission line system for damage or de-tuning.
Controller: High SWR
Shutdown Output Network (red) This alarm occurs if the transmitter tries to reduce the forward power below
a level that is equivalent to a 3:1 VSWR (user-configurable) at the SWR
Foldback threshold due to a gradually degrading load match. This alarm
causes the transmitter to latch off. Inspect the antenna and transmission
line system for damage or de-tuning.
Controller: High
Temperature
Summary - Not displayed in AUI or UI status. Configurable as a remote output.This
alarms occurs if there are high temperature related alarms occurring. Check
for specific temperature related alarms and troubleshoot accordingly.
Controller: Local UI
Failure (UI Failure) Exciter (red) This alarm occurs if there is a fault with the LCD user interface (UI),
preventing it from being used to control the transmitter. The transmitter will
automatically switch to remote control mode to allow use of the AUI or
digital I/O.
Controller: Low AC
Operation Power Supply (red) This alarm occurs if the ac input voltage is less than 175 V ac, but greater
than 90 V ac. Transmitter RF output power will be limited to approximately
33% of maximum power or to the current setpoint, whichever is less.
Controller: Low
Battery Exciter (amber) This alarm occurs if the backup battery voltage falls below an acceptable
level (2.7 V). The GV30N takes no action on this alarm. Use a digital
multimeter to measure the battery voltage (with ac power on). If the battery
voltage is low, replace the battery. If battery voltage is OK, cycle ac power
(off, then on). If the alarm does not clear, check the controller PWB (A4A2).
Controller: Low
Battery/Memory
Summary Power Supply (red) Not displayed in AUI or UI status. Configurable as a remote output.This
alarms occurs if there is a specific battery or memory related alarm present.
Check for specific alarms and troubleshoot accordingly.
Controller: Low
Efficiency Output network
(amber) This alarm occurs in conjunction with the Combiner Match alarm to indicate
that the transmitter is exhibiting low dc-RF efficiency.
Controller: Low
Forward Power (Low
Fwd Power) Output Network
(amber) This alarm occurs if the transmitter’s average forward power is below the
low forward power threshold (defaulted to 50% of the setpoint and is user
adjustable). Check for associated alarms and follow the associated
troubleshooting procedure, if applicable.
Controller: Low RF
Drive Exciter (red) This alarm occurs if the RF drive power from the exciter is less than the low
threshold (70% of the setpoint). Ths may be the result of a calibration
problem with either the exciter or the transmitter RF drive sample. Check all
connections to the exciter. Check the RF drive connection between the
exciter RF output and the RF drive splitter input.
Device and
Alarm Name
(AUI, UI)
Controller Front
Panel LED (color)
Description and Troubleshooting Action