CIGWELD WELDSKILL 180 - IGBTs Preliminary Check in Inverter PCB

0-5461 10-3 PRELIMINARY TROUBLESHOOTING-POWER SOURCE
SERVICE MANUAL
180
10.05 IGBTs Preliminary Check in Inverter PCB
Art # A-13059
Testpoint
No.
IGBT
Testing
Multimeter Lead Placement Testing
Diode Voltage VDC
Acceptable Results
3
4
IGBT Q4 Negative (black) meter lead to testpoint 3
Positive (red) meter lead to testpoint 4
Q4 CE Diode 0.2 – 0.8 VDC
5
6
IGBT Q1 Negative (black) meter lead to testpoint 5
Positive (red) meter lead to testpoint 6
Q1 CE Diode 0.2 – 0.8 VDC
7
8
IGBT Q3 Negative (black) meter lead to testpoint 7
Positive (red) meter lead to testpoint 8
Q3 CE Diode 0.2 – 0.8 VDC
9
10
IGBT Q2 Negative (black) meter lead to testpoint 9
Positive (red) meter lead to testpoint 10
Q2 CE Diode 0.2 – 0.8 VDC
Table 10-2 IGBT’s, Multimeter set to measure Diode Voltage
Testpoint
No.
IGBT
Testing
Multimeter Lead Placement Testing
Diode Voltage VDC
Acceptable Results
4
3
IGBT Q4 Negative (black) meter lead to testpoint 4
Positive (red) meter lead to testpoint 3
Q4 CE
Resistance
>150 Ω
6
5
IGBT Q1 Negative (black) meter lead to testpoint 6
Positive (red) meter lead to testpoint 5
Q1 CE
Resistance
>150 Ω
8
7
IGBT Q3 Negative (black) meter lead to testpoint 8
Positive (red) meter lead to testpoint 7
Q3 CE
Resistance
>150 Ω
10
9
IGBT Q2 Negative (black) meter lead to testpoint 10
Positive (red) meter lead to testpoint 9
Q2 CE
Resistance
>150 Ω
Table 10-3 IGBT’s, Multimeter set to measure ohms (Ω)