Lincoln Electric V160-S Service Manual page 84

F-24
MAIN IGBT INVERTER BOARD V160-S/T
"WELDING LOGIC AND INVERTER" SECTION TEST (continued)
FIGURE F.13 MAIN IGBT INVERTER BOARD LOCATION
VOLTAGE CHECKS ON JP1 INVERTER BOARD:
REFER PIN 2 AS GROUND
PIN 3 = 15 VDC
PIN 7 = O VDC (INVERTER ON)
PIN 7 = 15 VDC (INVERTER OFF)
PIN 3
PIN 7
PIN 2
OUTPUT DIODES
1K BOTH WAYS
CAN BE CHECKED AT
OUTPUT STUDS
ALSO
TROUBLESHOOTING & REPAIR
JP1:9 TO JP1:2 C FB (Current feedback from shunt) (Voltage signal between 0-10V = 0-600 Example 100A=1.66V)
JP1:10 to JP1:2 V FB (Voltage feedback) (Voltage signal bewteen 0-10V = 0-60 Example 7.1V = 42v)
R17 PTC
36 Ohms
INVERTER PCB
V160-S & -T
REVISION NUMBER
D11 CHECK FOR SHORT
2
1
1
2
2
BETWEEN POINTS
1
1
2
2
1
1
2
CHECK FOR SHORT
CHECK FOR SHORT
F-24
CHECK
1 & 2
FOR SHORTS
D17
27 Ohms
NORMAL
D19
27 Ohms
NORMAL