Fault Indicators - Crown FM2000A User Manual

3.4 Fault Indicators

Faults are indicated by illuminated red LED's when the following occurs:
Antenna—Load SWR exceeds 1.5:1. ALC voltage is reduced to limit the reflected
RF power.
RF Drive—Lack of or insufficient RF drive. If the RF drive fault LED is lit, input
drive must be increased. To achieve full output power, 70–80 watts of input drive is
required.
Possible equipment damage!
Do not exceed 80 watts of input drive.
Damage to the PA2000 will result if
this level is exceeded.
PA Temp—PA heatsink temperature is greater than 75°C (power foldback will begin
at this point).
PA DC—Power supply current for the PA (power amplifier) is at the preset limit, or
there is a difference of more than 2.5 amps in current between the individual PAs.
When this indicator is on ALC, the voltage is reduced automatically which holds the
supply current to the preset limit.
Fault Indicators
Metering
Power Out PA1 PA5
PA2 PA6
In Ref PA Temp
SWR PA Voltage PA3 PA7
ALC Tot Current PA4 PA8
®
Illustration 3–8 Fault Indicators
Operation
CAUTION
Fault Fuses
Antenna PA1 PA2 PA3 PA4
RF Drive
PA Temp
PA DC
PA5 PA6 PA7 PA8
3–7