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TroubleshooTing and sysTem TesTs

powermax

Service Manual 5-25

Test 5 – torch stuck open (TSO) or torch stuck closed (TSC)

Before the torch is activated and gas starts to ﬂow, the nozzle and electrode should be in contact or touching. If not, the

power supply will detect a TSO, or “torch stuck open,” fault. If the electrode and nozzle remain closed after the torch

receives a start signal, the power supply will detect a TSC, or “torch stuck closed.” In either case, you will have gas ﬂow.

Use the following test to determine if the torch is stuck in either position.

1. Turn OFF(O) the power.

2. Measure the resistance from J17 to J19 for 200–240V CSA and 230V CE power supplies. Measure the

resistance from J16 to J18 for 400V CE and 480V CSA power supplies. The resistance should read as closed

(very low resistance).

CAUTION

To avoid causing a short or damage to your meter, do not fire the torch with the multimeter

connected to the power board.

3. Turn ON(I) the power. Set the amperage adjustment knob to gas test mode. The resistance should read as very

high resistance.

4. If the resistance reads incorrectly, then the nozzle and electrode are in contact or 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.

5. Because TSO and TSC failures can be intermittent, repeat the test several times.

TP 19

TP 18

TP 17

192 VDC

200–240V CSA and 230V CE power supplies

J17

J19

TP17

TP18

TP16

~280 VDC

J16

J18

400V CE and 480V CSA power supplies

(Ferrite found on CE units only)

Hypertherm powermax45 Service Manual

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