Check Main Input Rectifier; Dc Bus Voltage Measurement - ESAB fabricator 141i Service Manual

ESAB FABRICATOR 141i

6.09 Check Main Input Rectifier

Input Rectifier Testing
AC1 to DC+
AC2 to DC+
AC1 to DC-
AC2 to DC-
Measurements may be made directly onto the main input rectifier. AC1 and AC2 may be measured from the pins on the mains supply
plug with the main power switch set to the ON position.

6.10 DC Bus Voltage Measurement

Apply voltage to the Power Source.
WARNING
There are extremely dangerous voltage and power levels present inside these Power Sources. Do
not attempt to diagnose or repair unless you have had training in power electronics measurement
and troubleshooting techniques.
Once power is applied to the Power Source, there are extremely hazardous voltage and power
levels present.
Do not touch any live parts.
TROUBLESHOOTING
Multimeter Lead Placement
Positive meter lead to AC1
Negative meter lead to testpoint DC+
Positive meter lead to AC2
Negative meter lead to testpoint DC+
Positive meter lead to testpoint DC-
Negative meter lead to testpoint AC1
Positive meter lead to testpoint DC-
Negative meter lead to testpoint AC2
Table 6-7 IGBT's, Multimeter set to measure Diode Voltage
11
12
18
2
1
22
21
6
5
10
17
9
20
7 8
6-8
Diode Voltage
0.2 – 0.8 VDC
0.2 – 0.8 VDC
0.2 – 0.8 VDC
0.2 – 0.8 VDC
16
15
19
13 14
Art # A-12171
Manual 0-5448