Hypertherm Powermax105 Service Manual - Manual (Page 190)

TroubleshooTing and sysTem TesTs
8-52
powermax
105 Service Manual
J27
WORK
LEAD
J26
RED
J18
ORG
J17
J32
J28
RED
J27
WORK
LEAD
J26
RED
J18
ORG
J17
J32
J28
RED
test 6 – torch stuck open (tSo)/torch stuck closed (tSC)
Symptom: No fault occurs at power-up but an 0-30 fault displays on the operator screen when attempting to fire the
torch.
Confirm that all of the proper consumables are installed in the torch.
In an idle (no start signal) working system with the torch and consumables installed, there should be continuity between
the dual black wires connected to the center post of the pilot arc IGBT and the red wire connecting to J28. With gas
flowing through the torch (gas test mode 1) there should be very high resistance between those two points.
Note: To set the system to gas test mode, display the service screen (refer to page 8-23 Displaying the service
screen), move the cursor to “G” (gas), and use the adjustment knob to toggle to “1” (gas test mode). If air
does not flow, the regulator might be faulty. Examine the fault log to see if any 3-20-n faults are logged.
gas test mode 0 gas test mode 1
<5 Ω >10 kΩ
Black wires
Continuous with
the nozzle or torch
outer body
Red wire J28 Continuous with
system negative