Hypertherm XPR460 - Do a Test for Continuity between the Nozzle and Workpiece; Safety Consideration for the XPR460

Hypertherm recommends coolant replacement every six months. For complete preventive maintenance
information, refer to the XPR Preventive Maintenance Program (PMP) Instruction Manual (809490).
13. If coolant flow stays slow after replacement, make sure that the bypass is operating correctly and that
these components are good:
□
Coolant pump motor
□
Consumables and torch
□
Coolant check valve
14. If you cannot find or correct the problem, speak to your cutting machine supplier or regional
Hypertherm Technical Service team.
Do a test for continuity between the nozzle and workpiece
This test helps to find faulty connections or damage in the pilot-arc circuit. This test will do a check of the
pilot-arc cable in the torch lead but not of the conductivity of the nozzle.
Safety consideration for the XPR460
For this procedure, make sure that you use the pilot-arc relay, NOT the cooler-power relay. When at least
one remote on-off switch is set to OFF (disabled), 220 VAC electric power stays ON (active) to the input
side of the cooler-power relay.
Diagnostics and Troubleshooting
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301811530Instruction ManualXPR460