ESAB CIGWELD Transmig 255i, Operating Manual, Page: 91 / 96

OPERATING MANUAL
Transmig 220i
Transmig 255i Transmig 255i
Manual 0-5550 A-1 APPENDIX
APPENDIX: TRANSMIG 255i CIRCUIT DIAGRAM
T
6
T
3
B
1
D31
D2
C4
3
R2
8
C4
4
R4
4
L
POSITIV
E
N
E
GA
T
IV
E
Main Power PCB
SOFT
START
HA
L
L
AC240V~
TR
1
TR
2
A
B
SW1
E
C
2
T
5
T
4
C61/62
3u
F
C
5
C
6
C
7
C
8
A
C
1
A
C
2
V
+
4
V
-
3
bridge1
A
C
1
A
C
2
V
+
4
V
-
3
Bridge2
EM
C
C1
2
C1
1
LT
V8
A
1
K
2
D9
C2
7
R5
8
A
1
K
2
D4
R5
9
R6
5
R6
4
C2
0
QD6
DC
+
V8-1
A
1
K
2
D3
VFB
PF
C
Dr
iv
e
Cir
cu
it
R6
9
R6
6
R6
7
R3
2
R3
1 R3
0
C1
6
1u
F
QD6
BOP
1u
F
C2
4
C1
0
FAN
1
2
3
4
IFB
+15
-15V
IF
GND
1
2
WVI
N
OUT+
OUT-
GN
D
OK=0V
GND
+24V
RED
BLACK
1 2
F
J
1
2
3
4
5
6
7
8
IN
1
2
3
4
5
6
7
8
IMOU
T
D
OC
C
A
+15V
B
OC2
D
OC
C
A
+15V
B
GND
1
2
3
4 O
T
75A
75A
1
2
3
POWER
1
1
2
3
POWE
R
+24V
GND
-24V
+24V
GND
-24V
OK=0V
GND
1
2
J-
OU
T
2
+24V
GND
+24V
GND
DIN REMOT
E
CL
K 4T/2T I/
O
flus/solid MM
A
OUT
1
MODE
+15V 0.8/1.0 WV
2
VGD/DS/AF WV
1
I_Welding
Display PCB
C
9
R18
7
M
Motor
1
2
M
D
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 J1-1
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
J1
1 2
15V
1 2
GUN
1
2
3
4
MT
I
N
+15V
MDV
GN
D
GND
1 2
GUN
1 2
GUN
1 2
SG
M
1 2
SG
M
1
2
P
W
M
1
2
PW
M
1
2
PF
C
1
2
3
JC
GND
PWM
VCC
PFC
1
2
3
4
5
6
7
8
R-G
1
2
Re
m
ote
Re
m
ote
switch
8
Pins
aero
socket
1
2
3
4
MIG
-QF/D
Y
GAS
GND
Gas control
G
as
valu
e
1
2
3
5
6
8
TRANSMIG 255i
Logic Control PCB
Spool Gun PCB
Art # A-13662