ESAB fabricator 141i, Service Manual

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ESAB FABRICATOR 141i
TROUBLESHOOTING 6-6 Manual 0-5448
6.07 Preliminary DC Bus Measurement of the Main PCB1
!
WARNING
Read and follow safety information in Section 6.02 before proceeding.
Art # A-12171
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DC Bus Testing Multimeter Lead Placement Voltage with SW1 OFF
Buck CAPACITOR
Negative meter lead to testpoint1
Positive meter lead to testpoint2
0V
Table 6-1 DC BUS, Multimeter set to measure DC volts
Output Diode Testing Multimeter Lead Placement Diode Voltage
Left Output Diodes
Positive meter lead to testpoint 5
Negative meter lead to testpoint 6
0.2 – 0.8 VDC
Right Output Diodes
Positive meter lead to testpoint 7
Negative meter lead to testpoint 8
0.2 – 0.8 VDC
Table 6-2 Output Diodes, digital meter set to measure Diode Voltage
IGBT Testing Multimeter Lead Placement Diode Voltage
IGBT 1
Positive meter lead to testpoint 9
Negative meter lead to testpoint 10
0.2 – 0.8 VDC
IGBT 2
Positive meter lead to testpoint 11
Negative meter lead to testpoint 12
0.2 – 0.8 VDC
IGBT 4
Positive meter lead to testpoint 13
Negative meter lead to testpoint 14
0.2 – 0.8 VDC
IGBT 5
Positive meter lead to testpoint 15
Negative meter lead to testpoint 16
0.2 – 0.8 VDC
Table 6-3 IGBT’s, digital meter set to measure Diode Voltage