Hypertherm XPR460 - Ohmic Resistance Values for Thermistors

115 300 600
125 200 500
135 150 400
145 150 250
155 125 225
165 100 175
e. For each resistance value that you measure, do the following:
If you see this condition... Do these steps...
The resistance value is outside of
the minimum or maximum value in
Ohmic resistance values for ther-
mistors on page 334.
Look for a wiring fault. To make a decision on if thermistor replacement is
necessary, speak to your cutting machine supplier or regional Hypertherm
Technical Service team.
The resistance value is approxi-
mately 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 value is more than
100 ohms (Ω) and less than the
minimum resistance value.
1. Remove the power from the cutting system.
2. Let the coolant get to a temperature that is ≤ 75°C (167°F).
3. Supply power to the cutting system.
4. Go back to the beginning of step 8 on page 333.
The resistance continues to be less
than the minimum ohmic value or
does not change after the coolant
is ≤ 75°C (167°F).
• Replace chopper 1 (PCB 2) for diagnostic code 560.
• Replace chopper 2 (PCB 3) for diagnostic code 561.
• Replace chopper 3 (PCB 8) for diagnostic code 562.
• Replace the copper pipe thermistor assembly for error code 587.
The thermistor resistance is in the
permitted range when the thermis-
tor is disconnected from the con-
trol PCB, and the code continues
when the thermistor is reconnected
to the control PCB.
To make a decision on if replacement of the control PCB is necessary,
speak to your cutting machine supplier or regional Hypertherm Technical
Service team.
The resistance is in the permitted
range.
You can continue to operate the plasma cutting system.
9. If you cannot find or correct the problem, speak to your cutting machine supplier or regional
Hypertherm Technical Service team.
Ohmic resistance values for thermistors
This data can help you to identify if there is a problem with the thermistor or wiring.
Diagnostics and Troubleshooting
8
334
811530 Instruction Manual XPR460