Instruction manual

Document: MAN00238A Page 27 of 28
R:\Documents\MAN Manuals\MAN00238A BRC-15-1111R-STD-J37.doc
C. Common Causes for Faults
1. Over-temperature (symptom: unit deactivates HV; ‘Ready’ indicator briefly off)
a. Fan intake and/or outlet is blocked, preventing adequate airflow.
b. Ambient air temperature exceeds specifications.
2. Interlock (symptom: unit deactivates HV; ‘Ready’ indicator off)
a. Top cover interlock switch open.
b. Interlock loop on J4 not shorted.
3. Over-voltage Fault
a. Large inductive element connected to output.
b. Misconnection of output to external high voltage source.
4. Overload Fault
a. Effective load resistance too low; extreme dynamic load.
b. Large capacitive load connected to output.
c. HV output misconnected to ground.
5. dV/dt Fault (Arc Fault)
a. Load arcing.
b. Output connections with insufficient spacing for high voltages.
6. Rail Fault
a. Failed IGBTs or HV rectifier diodes
b. Large capacitive load connected to output.
c. HV output misconnected to ground.