b. If the PCB configuration is 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 necessary, and continue with the next step.
8. Supply power to the cutting system.
9. Make sure that the torch does not touch the workpiece.
10. Use a digital multimeter to look for 24 VDC between the workpiece, or chassis ground, and the torch
tip (J3 or J4).
11. If there is no 24 VDC, examine the wiring to the ohmic PCB.
a. Make sure that the J3 or J4 connector is not clamped onto the wire insulation.
b. Make sure that the connection between the J2 or J2A connector and the relay coil is good.
c. Replace the relay if necessary.
d. If the connections are good but there is no 24 VDC, speak to your cutting machine supplier or
regional Hypertherm Technical Service team.
12. If you find 24 VDC, continue with these steps:
a. Make sure that both the workpiece and the TorchConnect console are grounded in the same
location.
b. Touch the torch tip to the workpiece, or attach a jumper wire between the torch tip and the
chassis ground.
c. Examine the D2 LED on the ohmic contact PCB.
Refer to Torch connect console ohmic PCB (141368) diagram on page 389.
d. Examine the D15 LED on the control PCB.
Refer to Torch connect console control PCB (141334) diagram on page 389.
e. Make sure that D2 and D15 both illuminate.
f. If D2 and D15 both illuminate, make sure that the CNC can receive ohmic contact signals from
the cutting system or Torch Height Control (THC).
If the CNC can receive ohmic contact signals, refer to the instruction manual for your CNC for
troubleshooting recommendations.
g. If D2 is not illuminated, replace the ohmic contact PCB.
h. If D2 (on the ohmic contact PCB) is illuminated and D15 (on the control PCB) is not
illuminated, examine the PCB wiring harnesses for loose wiring.
Diagnostics and Troubleshooting
8
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811530 Instruction Manual XPR460
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