Instruction manual

110
6.3. POOR OUTPUT VOLTAGE REGULATION
If the AC Power System exhibits poor voltage regulation the following item may be at fault:
1. The External Sense lines are not connected at the same point monitored by the
external voltmeter used for load regulation check.
SOLUTION: Connect AC voltmeter to External Sense lines.
If the AC Power System exhibits poor voltage regulation in the single phase mode driving more
than approximately 15% of rated load, the following items may be at fault:
1. Check module failure lights on the power modules to see if a module has failed.
SOLUTION: Disconnect both the power and logic connections in the failed amplifier per
paragraph 6.11. The unit will run at 67% power in a single cabinet system.
2. The fuses on one amplifier may have opened.
SOLUTION: Check fuses and connections to all amplifiers.
6.4. MODULE FAILURE LAMP ON
The MODULE FAILURE lamp turns on if any of the power amplifier modules cannot maintain a
regulated output proportional to the oscillator reference input. If the MODULE FAILURE lamp
turns on, the following items may be at fault:
1. The output is overloaded.
SOLUTION: Remove the overload. Observe the output capability of the power source.
2. The three phase input voltage is too low or one of the input phases is not
functioning.
SOLUTION: Verify that the voltage to the power source is within the specified input
range and that all three phases are active.
3. An overtemperature condition exists.
SOLUTION: If an overtemperature condition has caused the MODULE FAILURE lamp
to turn on, the OVERTEMP lamp will also be lit. Refer to paragraph 6.5.
4. An amplifier has failed or its 300 volt bus fuse has blown.