Hypertherm Powermax125 Service Manua - Manual (Page 134)

134 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
0-21-0 Excessive arc voltage
change: check consumables,
gas flow
On On
The DSP monitors the nozzle to electrode
voltage and if it detects a rapid change in
that voltage, the inverter shuts down.
Usually this indicates a rapid loss of gas
pressure from a kinked or blocked air
supply line.
• Correct any gas supply restrictions and
restart the power supply.
• Check the torch lead for leaks or
kinking.
• Verify that air flows through the
electronic regulator in gas test mode.
Replace the regulator if necessary.
• Possible faulty DSP or power board.
• Change the consumables.
• For mechanized applications, lock out
the torch height control.
0-22-0 No gas input
On On
• Restore the gas supply.
• Restart the power supply.
With proper air connected, measure the
resistance between J5 pins 1 and 2.
• If the circuit is shorted, replace the
power board.
• If the circuit is open, check the cable
harness between J5 and the pressure
switch. If the harness is good, replace
the pressure switch (228688).
• Perform Test 10 – Pressure sensor on
page 163.
0-nn-n
Fault
code
Description
Power
LED Fault
LED Fault
icon
Solutions