Nautel XL12, Technical Instructions

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12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 5)
01 January 2002
TABLE OF CONTENTS
(Continued)
Section
4 OPERATING INSTRUCTION
(Continued)
4.9.1.2 Exciter 'B' Active ................................................................................................ 4-4
4.9.1.3 Exciter Assemblies ............................................................................................ 4-4
4.9.2 PRESET RF POWER SELECTION............................................................................ 4-4
4.9.3 RF POWER TRIM .................................................................................................... 4-5
4.9.3.1 Increase RF Power ............................................................................................. 4-5
4.9.3.2 Decrease RF Power............................................................................................ 4-5
4.9.4 RF ON/OFF SELECTION .......................................................................................... 4-5
4.9.4.1 RF On Selection................................................................................................. 4-5
4.9.4.2 RF Off Selection................................................................................................. 4-5
4.9.5 LOCAL/REMOTE CONTROL SELECTION .................................................................. 4-5
4.9.6 ADJUST AUDIO LEVEL ............................................................................................ 4-5
4.10 STATUS DISPLAYS ................................................................................................ 4-5
4.10.1 DISPLAY COLOUR .................................................................................................. 4-5
4.10.2 DISPLAY TYPE ....................................................................................................... 4-6
4.10.2.1 Latching Alarm Display ....................................................................................... 4-6
4.10.2.2 Non-Latching Alarm Displays............................................................................... 4-6
4.11 TESTING DISPLAYS ............................................................................................... 4-7
4.12 LATCHING PROTECTION CIRCUITS........................................................................ 4-7
4.12.1 B+ POWER SUPPLY OVER TEMP........................................................................... 4-7
4.12.2 PDM FAILURE ......................................................................................................... 4-7
4.12.3 RF POWER MODULE FAILURES ............................................................................. 4-7
4.12.3.1 RF Drive Failure Detectors................................................................................... 4-7
4.12.3.2 Over Temperature Detector.................................................................................. 4-8
4.12.3.3 Modulator Failure Detectors................................................................................. 4-8
4.12.4 RESETTING LATCHED PROTECTION CIRCUITS ........................................................ 4-8
4.13 TURN-ON EXPECTATIONS ...................................................................................... 4-8
5 SYSTEM LEVEL TROUBLE SHOOTING
5.1 GENERAL ............................................................................................................... 5-1
5.2 SCHEDULED MAINTENANCE................................................................................... 5-1
5.3 CORRECTIVE MAINTENANCE.................................................................................. 5-1
5.3.1 ON-AIR TROUBLE SHOOTING.................................................................................. 5-2
5.3.1.1 Remote Trouble Shooting .................................................................................... 5-2
5.3.1.2 Local Trouble Shooting........................................................................................ 5-2
5.3.2 OFF-AIR TROUBLE SHOOTING ................................................................................ 5-2
5.4 ELECTROSTATIC PROTECTION.............................................................................. 5-2
5.5 TROUBLE SHOOTING FRONT PANEL ALARMS....................................................... 5-2
5.5.1 RF POWER MODULES ALARM................................................................................ 5-3
5.5.1.1 RF Power Module Fault Validation ....................................................................... 5-3
5.5.1.2 RF Power Module Trouble Shooting...................................................................... 5-3
5.5.2 EXTERNAL INTERLOCK ALARM ............................................................................... 5-3
5.5.3 INTERNAL INTERLOCK ALARM ................................................................................ 5-3
5.5.4 B+ POWER SUPPLY - AC FAIL ALARM ................................................................... 5-4
5.5.5 B+ POWER SUPPLY - OVER VOLTAGE ALARM ...................................................... 5-4
5.5.6 B+ POWER SUPPLY - UNDER VOLTAGE ALARM .................................................... 5-4
5.5.7 B+ POWER SUPPLY - TEMPERATURE ALARM ....................................................... 5-4