Diagnostics and Troubleshooting
348 809480 Instruction Manual XPR300
Figure 65 – Measure the resistance from the torch tip to the ohmic relay
a. If the resistance is infinite (open), replace the torch lead.
b. If the resistance is less than 100 Ohms, continue with step 5.
5. Reconnect the ohmic relay connector.
6. Examine the ohmic contact PCB. Refer to Torch connect console ohmic PCB (141368) on
page 358.
a. If configured for internal ohmic, make sure that the ohmic wire from the ohmic relay is
connected to J3.
b. If configured for external ohmic, make sure that the ohmic wire from the ohmic relay is
connected to J4 pin 2 and that the ohmic wire from the lifter is connected to J4 pin 1.
c. Adjust or tighten connections, if needed, then continue with step 7.
7. Supply electrical power to the cutting system.
8. Make sure that the torch is not touching the workpiece.
9. Use a digital multimeter to look for 24 VDC between the workpiece, or chassis ground, and the
torch tip (J3 or J4).
10. If there is no 24 VDC, examine the wiring to the ohmic PCB (141368). Make sure that the J3 or
J4 connector is not clamped onto the wire insulation and that the connection between the J2 or
J2A connector and the relay coil is good.
If the connections are good but there is no 24 VDC, contact your cutting
machine supplier or regional Hypertherm Technical Service Team.
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