Test 7 — torch stuck open (tso), Powermax1000 – Hypertherm Powermax1000 Service Manual User Manual

Page 58

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MAINTENANCE

1

powermax1000

Service Manual

3-25

Test 7 – torch stuck open (TSO)

• Check the resistance between the pilot arc IGBT (Q8) and J17. The value should be less than (<) 100

Ω.

• Switch to Gas Test mode and check the resistance again. The value should be greater than (>) 1k

Ω.

• If the value is less than (<) 100

Ω all the time, check resistance between pilot arc IGBT (Q8) and J17 with

the torch removed. If the value is less than (< )100K

Ω, replace the pilot arc IGBT (Q8).

• If the resistance is always greater than (>) 100

Ω, then the electrode/nozzle circuit is open.

• Check the wiring to the torch.
• Replace all consumables and verify that the torch will fire.

Note: The retaining cap should be snug and not over-tightened.

• If the torch plunger does not move freely in the torch head, replace the torch head.

• Check to see if the pilot arc IGBT (Q8) is open by putting a jumper wire from J14 to the Pilot Arc IGBT (Q8).

Then attempt to fire the torch. If the torch fires, replace the Pilot Arc IGBT (Q8).

Note:

All values are ±25%.

Pilot arc IGBT
Q8

J17

J14

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