Troubleshooting for duty cycle limit on proportional valve supply
voltage
Diagnostic code 719
This code occurs when a proportional valve supply voltage for some gases is at maximum duty cycle.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
719 The H
2
, Ar, or N
2
proportional valve supply voltage is
at 100% duty cycle. Total flow is decreased to keep
the mix percentage of the other gases accurate.
Because the mixer tries to supply a flow, the outlet
pressure can continue to increase.
All models None • Start process
• Set process
• Remote on-off
Corrective action
1. Make sure that the consumables are correct.
2. Make sure that the inlet pressures for N
2
, Ar, and H
2
are consistently in the permitted range.
3. Make sure that you have the most recent XPR firmware.
You can log into the Xnet at www.hypertherm.com to download it.
Troubleshooting for pressure out is greater than pressure in
Diagnostic code 720
Diagnostic code 720 occurs when the output pressure is more than the input pressure on the mixer.
Diagnostics and Troubleshooting
8
364
811530 Instruction Manual XPR460
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