ESAB fabricator 141i Service Manual page 54

ESAB FABRICATOR 141i
DRIVE Header Pin
1
2
3
4
5
6
7
Table 6-20 DRIVE Header Pin Function (Connects to IN header on Main PCB1)
WVIN Header Pin
1
2
3
IFB Header Pin
1
2
3
4
Table 6-22 IFB Header Pin Function (Connects to welding output current sensor)
SOURCE Header Pin
1
2
3
Table 6-23 SOURCE Header Pin Function (Connects to DY2 header on Main PCB1)
CR Header Pin
1
2
3
Table 6-24 CR Header Pin Function (Connects to CR header on Burnback PCB5)
IGBT OT Header Pin
1
2
NTCS Header Pin
1
2
Table 6-26 NTCS Header Pin Function (Connects to NTCS header on Main PCB1)
TROUBLESHOOTING
IGBT1 ,4 PWM Driver Signal
IGBT2 ,5 PWM Driver Signal
IGBT2 ,5 PWM Driver Signal
IGBT1 ,4 PWM Driver Signal
Rectified Secondary of Current Transformer TR8
Pin Function
Negative welding terminal
Positive welding terminal
Table 6-21 WVIN Header Pin Function (Connects to welding terminals)
Common of +24V and -24V
Burn back potentiometer Min
Burn back potentiometer wiper
Burn back potentiometer Max
NTC temperature sensor
NTC temperature sensor
Table 6-25 IGBT OT Header Pin Function (Connects to 47K NTC resistor)
Pin Function
Power source for NCT circuitry
Power source for NCT circuitry
Pin Function
+15V
Common of +15V
Not used
Pin Function
+15V power source
-15V power source
Current sensor signal
0V
Pin Function
+24V power source
-24V power source
Pin Function
Pin Function
6-12
Signal
+15 VDC
5VDC Vpk
5VDC Vpk
5VDC Vpk
5VDC Vpk
-6VDC
0VDC
Signal
Negative welding voltage
n/c
Positive welding voltage
Signal
+15VDC
-15VDC
4V/ 300A
0V
Signal
+21~25VDC
0V
-21~25VDC
Signal
0V
0-5VDC
+5VDC
signal
0V-5V
Overtemperature
when voltage less
than 0.9v.
0V
Signal
12VDC between Pin 1 and pin 2
Manual 0-5448