Test 8 - Plasma Start; Test 9 - Torch Cap Sensor - Hypertherm powermax1250 Service Manual

Test 8 – plasma start
• After you turn ON the power, place a jumper wire between red and white on the machine interface (J19).
The torch should produce an arc.
Note: This only applies to the machine torch.
• If the torch fires, inspect the machine interface cable and verify the start signal from the CNC by verifying
that the start LED on the control board illuminates (see Control board LEDs ).
• If torch does not fire, verify that the start LED on the control board (PCB3) also is not illuminating.
• To test hand torch operation, pull the trigger and verify that the start LED illuminates (see Control board
LEDs ).
• If the start LED is OFF, verify continuity between the purple and orange wires on the Easy Torch Removal
(ETR) connector of the torch lead.
• If the start LED is OFF and the trigger works correctly, place a jumper wire between pins 3 and 4 of U22. If
the start LED illuminates, replace the power board (PCB2). If it does not illuminate, replace the control
board (PCB3).
Test 9 – torch cap sensor
• Remove the ETR connector (J18) from the power supply.
• Check the continuity of pins 11 and 12 with the consumables installed in the torch.
• If the connection is open, check the wiring in the torch leads and the cap-sensor switch.
• With the power OFF, place a jumper wire between pins 3 and 4 of U23.
• Turn ON the power. If the torch cap-sensor LED goes out, replace the power
board (PCB2). If the LED remains illuminated, replace the control board
(PCB3).
ETR connector
(J18)
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