Hypertherm Powermax125 Service Manua - Manual (Page 160)

160 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
Test 7 – Start signal
Symptom: There is no arc when the torch trigger is closed. See Powermax125 schematic diagram on page 317.
If the start icon is displayed and there is a fault code 0-51 at power up:
 Remove the torch from the system.
 Check the resistance between pin 6 and pin 7 In the lead plug, with the torch trigger open (not pulled).
 If there is very low resistance, inspect the lead set and trigger switch for shorts and replace or repair as necessary.
If the icon is not displayed at power up and does not appear when the torch trigger is closed:
 Remove the torch from the system.
 Close the trigger switch and check the resistance between pin 6 and pin 7.
 If there is very high resistance, inspect the lead and trigger switch for opens and replace or repair as necessary.
If there is no problem found with the torch wiring or trigger switch and there is still no arc or start icon:
 Turn the machine OFF and disconnect the power.
 Remove the nozzle and electrode from the torch and reinstall the retaining cap.
 Reconnect the power and turn the machine on.
 Temporarily connect J17 pin 2 to pin 3.
Figure 29
 If gas does not flow and there is no start icon on the display, perform Torch-related faults – continuity check on
page 142:
 Verify the DSP board is working by replacing it with a known good DSP board.
 If the DSP board is not the problem, replace the power board.
WARNING!
Point the torch away from you before performing a gas test. Always keep hands, clothes, and objects
clear of the torch tip, and never point the torch toward yourself or others.
pin 2
pin 1
pin 3