If you get this condition... Do these steps...
The resistance is at or near 0 ohms (Ω). 1. Examine the wiring between each thermistor and its connector pins.
2. Look for shorts between wires or to the ground.
The resistance is in the permitted range. Continue cutting system operation.
The resistance stays at less than the mini-
mum ohmic value or does not change after the
coolant gets to:
• ≤ 85°C (185°F) for XPR170 and XPR300
• ≤ 75°C (167°F) for XPR460
Speak to your cutting machine supplier or regional Hypertherm Techni-
cal Service team.
The thermistor resistance is in the permitted
range when the thermistor is disconnected
from the control PCB, and the code continues
when the thermistor is reconnected to the con-
trol PCB.
Speak to your cutting machine supplier or regional Hypertherm Techni-
cal Service team. They can help you make a decision on if control PCB
replacement is necessary. Refer to Plasma power supply control PCB
(141545) diagram on page 382.
3. If you cannot find or correct the problem, speak to your cutting machine supplier or regional
Hypertherm Technical Service team.
Do an ohmic-contact test
Use this test to examine the resistance from the torch tip to the ohmic relay in the plasma cutting system.
This test helps to find ohmic contact issues.
1. Remove the power from the cutting system.
2. Remove the top panel and the side panels from the TorchConnect console.
3. Examine the J2 connector on the ohmic contact PCB.
Make sure that the ohmic-relay coil is connected. Reconnect or tighten the ohmic-relay coil if
necessary.
4. Disconnect the ohmic-relay connector to get access to the bullet connector on the torch receptacle
block-side inside of the TorchConnect console.
To disconnect the ohmic-relay connector, unscrew and unplug it.
Diagnostics and Troubleshooting
8
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811530 Instruction Manual XPR460
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