Measure resistance from thermistors
Use this procedure to measure the resistance of each thermistor wire.
1. Use a digital multimeter to measure the resistance from each thermistor wire, using these connector-
pin locations:
Thermistor location
Location of thermis-
tor wires/connector
1st con-
nector pin
2nd con-
nector pin
Inductor 1A PCB 1 (plasma power supply) J1.4 pin 3 J1.4 pin 4
Inductor 1B PCB 1 (plasma power supply) J1.4 pin 5 J1.4 pin 6
Inductor 2A
1
PCB 1 (plasma power supply) J1.4 pin 7 J1.4 pin 8
Inductor 2B
1
PCB 1 (plasma power supply) J1.2 pin 1 J1.2 pin 2
Inductor 3A
2
PCB 1 (plasma power supply) J1.2 pin 3 J1.2 pin 4
Inductor 3B
2
PCB 1 (plasma power supply) J1.2 pin 5 J1.2 pin 6
Transformer 1 PCB 1 (plasma power supply) J1.4 pin 1 J1.4 pin 2
Transformer 2
2
PCB 1 (plasma power supply) J1.25 pin 1 J1.25 pin 2
Control transformer
2
PCB 1 (plasma power supply) J1.25 pin 3 J1.25 pin 4
Chopper 1 PCB 2 (plasma power supply) J2.2 pin 1 J2.2 pin 3
Chopper 2
1
PCB 3 (plasma power supply) J3.2 pin 1 J3.2 pin 3
Chopper 3
2
PCB 8 (plasma power supply) J4.2 pin 1 J4.2 pin 3
Coolant temperature
3
PCB 1 (plasma power supply) J1.2 pin 7 J1.2 pin 8
Coolant temperature
2
PCB 2 (cooler) J2.4 pin 1 J2.4 pin 2
1 XPR300 and XPR460 only
2 XPR460 only
3 XPR170 and XPR300 only
2. Look for a resistance value that is outside of the minimum or maximum value in Ohmic resistance
values for thermistors on page 334.
At approximately 25°C (77°F), look for a resistance of approximately 10,000 ohms (Ω).
If you get this condition... Do these steps...
The resistance is more than the maximum
value.
Speak to your cutting machine supplier or regional Hypertherm Techni-
cal Service team. They can help you to identify if there is a wiring fault or
if thermistor replacement is necessary.
Diagnostics and Troubleshooting
8
307811530Instruction ManualXPR460
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