Test 6 - Plasma Start; Test 7 - Torch Cap Sensor - Hypertherm Powermax 30 Service Manual

MAINTENANCE
Test 6 — plasma start
Verify that the control board LED is receiving a valid start signal.
1. With the power ON, look at the Start LED on the control board. It should illuminate whenever the trigger is
pulled.
2. Set the ON/OFF switch to OFF (O). Check the resistance at the 2 torch-start test points on the power board.
With the trigger engaged, the resistance should be 10 Ω or less. With the trigger disengaged, the circuit should
read as approximately 3 kΩ. If this test fails, check the torch's start switch and the torch wires.
3. Set the ON/OFF switch to ON (I). Measure pin 16 of J7 to ground (see Test 2 , earlier in this section). It should
measure as 0 VDC for an open circuit or 3.2 VDC for a closed circuit. If the values are not correct, replace the
power board.
Caution:
J12
Test 7 — torch cap sensor
Test the cap sensor switch and torch leads.
1. Set the ON/OFF switch to OFF (O).
2. Gently pull the front endcap away from the power supply. Unplug J12 from the back side of the power board
(just below the torch-start test points).
3. Measure the resistance from the orange wire to the blue wire. It should measure less than 10 Ω. If it reads as
open, the cap sensor switch circuit is not satisfied.
4. If the torch plunger moves smoothly and the consumables are correctly installed, then either the cap sensor
switch is faulty or the torch lead has a broken wire. Replace the faulty part.
3-20
While testing, avoid any contact with the tip of the torch.
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