Look for a resistance of approximately 280 ohms (Ω).
7. If the ohms value is more than 10% higher or lower than 280 ohms (Ω), replace the pilot-arc relay.
8. If the ohms value is in the permitted range, make sure that you have the most recent XPR firmware.
You can log in into the Xnet at www.hypertherm.com to download it.
Troubleshooting for high or low chopper voltage
Diagnostic codes 779, 780, 781
Diagnostic codes 779 – 781 occur when the chopper voltage is not in the permitted voltage range.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
779 The Chopper 1 15 V bus is out of range (less than
13 V or more than 17 V).
All models
780 The Chopper 2 15 V bus is out of range (less than
13 V or more than 17 V).
XPR300,
XPR460
781 The Chopper 3 15 V bus is out of range (less than
13 V or more than 17 V).
XPR460
None • Start process
• Set process
• Remote on-off
Corrective action
1. Examine the 24 VDC on connector J2, pin 1 and pin 2 for the chopper that gives the diagnostic code.
2. If there is no 24 VDC, examine the J2 wiring on the chopper.
3. Tighten loose connections, if found.
4. If you measure 24 VDC, replace the chopper assembly.
Troubleshooting for high voltage on the 24 V power supply
Diagnostic code 784
Diagnostic code 784 occurs when the voltage on the 24 V internal power supply component is too high.
Diagnostics and Troubleshooting
8
379811530Instruction ManualXPR460
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