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Test 5 – inverter igbt (q6) and pfc igbt (q7), Powermax1250, Maintenance 3-26 – Hypertherm Powermax1250 Service Manual User Manual

Page 59: Service manual

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MAINTENANCE

3-26

powermax1250

Service Manual

4

Test 5 – inverter IGBT (Q6) and PFC IGBT (Q7)

• Check the resistance of the gate-drive circuit.

• If values are not ±25% of the values shown below, replace the power board (PCB2) and the appropriate

IGBT.

• If values are correct, check both IGBTs with an IGBT tester. If one IGBT fails, replace the power board

(PCB2) and the failed IGBT.

80

C100

80

C100

Inverter IGBT (Q6)

PFC IGBT (Q7)

o

o

o

o

R

6

5

R

8

2

Inverter

R82 = 994

R83 = 6.1

R65 = 995

R75 = 6.1

R84 = 10.4

R96 = .4

PFC

R87 = 994

R56 = 4.1

R98 = 1