Hypertherm Powermax 30 User Manual

MAINTENANCE
powermax30 Service Manual 3-19
Test 5 – torch stuck open (TSO)
Before the torch’s trigger is pulled and gas starts to flow, the nozzle and electrode should be closed. If not, the
power supply will detect a TSO, or “torch stuck open,” fault. Use the following test to determine if the torch is stuck
open.
1. Set the ON/OFF switch to OFF (O).
2. Measure the resistance from the torch lead’s white wire group and red wire to the positive and negative
connections on the power supply. The resistance should read as closed.
3. If the resistance reads as open, then the nozzle and electrode are not touching, or one of the wires in the torch
lead is broken. Make sure that the torch plunger moves freely in the torch head. If it does not, replace the torch
head. If the torch parts are working properly, replace the torch lead.
White wire
group
Red wire

Hypertherm Powermax 30 Specifications

General

Brand	Hypertherm
Model	Powermax 30
Category	Welding System
Language	English