Hypertherm Powermax30 AIR Service Manual - Manual (Page 86)

86 Powermax30 AIR Service Manual 808850
5 – Troubleshooting and System Tests
5. Turn ON (I) the power. With the system idle, quickly tap the torch trigger to force gas flow without firing an arc. Is gas
flowing?
 If yes, the gas will flow for 5 seconds before shutting off. While the gas is flowing, measure the resistance
between the torch lead’s white wire group
and red wire . The resistance should read very high – an open
circuit – when gas is flowing.
If the resistance reads as very low (closed circuit) with the gas flowing, the nozzle and electrode are in
contact or a short-circuit occurred in one of the wires in the torch lead. Continue with
step 6.
 If no, the solenoid valve may be faulty. Perform Test 4 – solenoid valve on page 84.
6. Does the torch plunger move freely in the torch head?
 If yes, replace the torch lead. See Replace the torch lead on page 197.
 If no, replace the torch body. See Replace the torch body on page 193.
7. Because “torch stuck open” and “torch stuck closed” failures can be intermittent, repeat the test several times.
CAUTION!
To avoid causing a short or damage to the multimeter, do not fire the torch with the multimeter
connected to the torch lead’s white wire group and red wire while the system is powered ON.
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