Test 5 – inverter igbt (q6) and pfc igbt (q7), Powermax1250, Maintenance 3-26 – Hypertherm Powermax1250 Service Manual User Manual
Page 59: Service manual
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
Ω
R83 = 6.1
Ω
R65 = 995
Ω
R75 = 6.1
Ω
R84 = 10.4
Ω
R96 = .4
Ω
PFC
R87 = 994
Ω
R56 = 4.1
Ω
R98 = 1
Ω
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