Tweco CutMaster 101 with SL100SV - Manual (Page 86)

SERVICE 5-22 Manual 0-4642
5
F. Gas flows; No arc in torch; AC , GAS , and DC indicators ON; TEMP indicator off
1. Faulty IGBT(s)
a. Measure between the following points on the IGBTs:
• IGBT A: E4 to E10
E10 to E20
• IGBT B: E23 to E27
E27 to E30
Voltage should be approximately 20 vdc before the start signal is active. If voltage measures greater than 100
vdc when the start signal is active, replace the respective IGBT(s).
Art # A-03659
INPUT
DIODE
E3
E7
E15
E10
E20
E4 J30 E33
E26
E27
E30
J31 E23
J25
IGBT A IGBT B
J11
Main PC Board Layout (IGBT Test Points)