Page
15
of
20
For more information:
Document #7650-0038 Rev A1. © Copyright 2019 Directed Energy, Inc. All rights reserved.
7.0 TROUBLESHOOTING
7.1 Troubleshooting Procedures
Before attempting to service or troubleshoot the PVX-4140 B, review the safety
summary above.
The below information summarizes potential problems and their solutions. If these
recommendations do not resolve the problem, DEI customer service can be contacted
for further assistance.
•
Power LED does not illuminate
o
AC power not plugged in
o
Fuse(s) are blown
•
Cannot enable output
o
External remote interlock circuit is not satisfied
•
No Output Pulse
o
Output is not enabled
o
External remote interlock circuit is not satisfied
o
No gate input
o
Gate input pulse voltage too low: Increase voltage
o
Gate input pulse width too narrow: Increase width
o
Gate input pulse frequency too high: Reduce frequency
o
No high voltage: Check HV supplies for correct operation
o
Output not connected correctly: Check all cables and connections
o
Instrument is damaged: Contact DEI customer service
7.1.1 Fuses
To avoid fire hazard or damage to the instrument, use only the fuse types listed on the
rear panel. Fuse replacement should be performed by qualified personnel only.
8.0 SYSTEM FAILURE MODES
The PVX-4140 B is capable of generating large amplitude current pulses with very fast
rise and fall times. There is limited over-current or over-voltage protection circuitry, and
it is the user's responsibility to assure that the interconnect cables and load do not
create transients, over-current or over-voltage conditions that could damage the PVX-
4140 B. FAILURE TO DO SO VOIDS THE WARRANTY.
8.1 Over-Current Failure
Depending on the value of load voltage, the overcurrent limit may or may not be
exceeded even when connected to a shorted load. Typically, the output voltage must
be greater than 733 V. If the output voltage is in excess of 733 V and the load is
shorted, then the Over Current LED should illuminate. Internally, this indicates that the
