Preliminary Dc Bus Measurement Of The Main Pcb1 - ESAB fabricator 141i Service Manual

ESAB FABRICATOR 141i

6.07 Preliminary DC Bus Measurement of the Main PCB1

WARNING
!
Read and follow safety information in Section 6.02 before proceeding.
DC Bus Testing
Buck CAPACITOR
Output Diode Testing
Left Output Diodes
Right Output Diodes
IGBT Testing
IGBT 1
IGBT 2
IGBT 4
IGBT 5
TROUBLESHOOTING
11
12
18
2
1
22
21
6
5
Multimeter Lead Placement
Negative meter lead to testpoint1
Positive meter lead to testpoint2
Table 6-1 DC BUS, Multimeter set to measure DC volts
Multimeter Lead Placement
Positive meter lead to testpoint 5
Negative meter lead to testpoint 6
Positive meter lead to testpoint 7
Negative meter lead to testpoint 8
Table 6-2 Output Diodes, digital meter set to measure Diode Voltage
Multimeter Lead Placement
Positive meter lead to testpoint 9
Negative meter lead to testpoint 10
Positive meter lead to testpoint 11
Negative meter lead to testpoint 12
Positive meter lead to testpoint 13
Negative meter lead to testpoint 14
Positive meter lead to testpoint 15
Negative meter lead to testpoint 16
Table 6-3 IGBT's, digital meter set to measure Diode Voltage
10
17
9
20
7 8
Voltage with SW1 OFF
6-6
16
15
19
13 14
Art # A-12171
0V
Diode Voltage
0.2 – 0.8 VDC
0.2 – 0.8 VDC
Diode Voltage
0.2 – 0.8 VDC
0.2 – 0.8 VDC
0.2 – 0.8 VDC
0.2 – 0.8 VDC
Manual 0-5448