Nautel VS2.5 Troubleshooting Manual

Also see for VS2.5: Installation manual Installation manual Troubleshooting manual

Contents

VS2.5 Troubleshooting Manual Responding to alarmsIssue 4.0 2012-12-01 Page 1-23Running BiasRoutine- This is an informational alarm only that is displayed when the biasroutine has been initiated.RebootedExciterExciter (red) This is an informational alarm only that is displayed when thewatchdog timer reboots the transmitter’s main microcontroller(DSP). Typically, this alarm will show up after an ac powerinterruption.SCA1 AudioLow(SCA1 AudLow)Exciter (amber) This alarm indicates the SCA 1 input level is too low or is notapplied. The VS2.5 takes no action on this alarm.SCA2 AudioLow(SCA2 AudLow)Exciter (amber) This alarm indicates the SCA 2 input level is too low or is notapplied. The VS2.5 takes no action on this alarm.SRC1 Unlock Exciter (amber) This alarm indicates that no valid AES/EBU stream data is beingdetected on the selected AES/EBU. The VS2.5 takes no action onthis alarm.SWR Foldback Output Network(amber)This alarm occurs if the transmitter's average reflected powerexceeds the SWR foldback threshold (103 W) due to a graduallydegrading load match. The forward power of the transmitter will belimited to a level such that this threshold is not exceeded. If theload match improves while the transmitter is producing RF output,the forward power will increase. If the transmitter folds back to aforward power that is equivalent to a 3:1 VSWR at the SWRFoldback threshold (forward power of 412 W), an SWRShutdown alarm occurs. Inspect the antenna and transmissionline system for damage or de-tuning. If there are no major issueswith the antenna network that would cause an impedance change(icing for example), suspect the combiner interface PWB (A12)(see “Combiner Interface PWB Replacement” on page 1-43).Alarm NameAUI and(Front Panel)Front PanelLED (color) Description and Troubleshooting Action