Hypertherm Powermax45 Service Manual - Manual (Page 101)

TroubleshooTing and sysTem TesTs
powermax
45 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
W
- + - +
TP 18
R
TP 17
B
192 VDC 192 VDC
200–240 V CSA and 230 V CE power supplies
J17
J19
TP17
W
+ - + -
TP18
B
TP16
R
~280 VDC ~280 VDC
J16
J18
400 V CE and 480 V CSA power supplies
(Ferrite found on CE units only)