CHPA
S
ERIES
B-6
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EV
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B.7 Fault Messages That Correspond to Digital
Status Lines
Interlocks Open Fault
I N T E R L O C K S O P E N F L T
TWT Over Temperature Fault
T W T O V E R T E M P F A U L T
Power Supply Arc Detected Fault
P S A R C D E T E C T E D F L T
DC Buss Fault
D C B U S S F A U L T
External Interlock Open Fault
E X T I N T E R L O C K F A U L T
SSIPA Over Current Fault
S S I P A O V E R I F A U L T
Low Airflow Fault*
L O W A I R F L O W F A U L T
* Units built prior to March 1997 are equipped with a pressure differential switch to provide
this fault. Units built after March 1997 do not have this switch.
B.8 Fault Messages Generated By Limit
Comparisons
The microprocessor controller monitors voltages that correspond to HVPS (High Voltage Power
Supply) voltage and current parameters as well as RF power (drive, output, and reflected)
parameters. When a parameter falls outside of a predefined window (some windows may be
active only during certain HPA states or modes), a fault is generated and one of the following
messages will appear:
