POWER MIG 255 (230/460/575V)
CAVITY NUMBERING SEQUENCE
(COMPONENT SIDE OF P.C. BOARD)
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| 1 | 3 | 1 | 4 | 1 | 5 |
J8 | 1 | J6 |
| J1 |
| J4 |
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2 |
| J9 |
| J7 |
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| 4 | 6 | 5 | 8 | 6 | 10 |
1 |
| 6 |
| 1 | 7 | 1 | 8 |
J3 |
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| J2 |
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| J5 |
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7 |
| 12 |
| 8 | 14 | 9 | 16 |
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| J10 |
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| 10 |
| 1 |
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GUN
TRIGGERJ11**
1 | 324 | 1 |
2 
325 
2 
325
3 | 3 |
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4 | 4 | 324 |
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
COLOR CODE:
B - BLACK
W - WHITE
R - RED
U - BLUE
INDICATES CONNECTOR CAVITY NO.
** CAVITY
NUMBERING SEQUENCE
(NON-LEAD SIDE OF CONNECTOR)
2 | 1 | 2 |
J11
J12J13
1 | 3 | 4 |
NOTES:
N.A. WELDING CABLE MUST BE OF PROPER CAPACITY FOR THE CURRENT AND DUTY CYCLE OF IMMEDIATE AND FUTURE APPLICATIONS.
N.B. THIS DIAGRAM SHOWS THE "ELECTRODE" POLARITY "POSITIVE". TO CHANGE POLARITY, TURN THE UNIT OFF AND REVERSE LEAD CONNECTIONS AT CABLE CONDUCTOR STRAP AND WORK STUD.
| J10 | DISPLAY |
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| BOARD |
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
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| 552 | 551 | 550 | 515 | 500 |
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| 254A |
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| R4 |
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| R3 | |
256 | 253 | 254 |
| 251 |
| 252 |
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| ARC |
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| WIRE FEED | |
| VOLTAGE |
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| SPEED | |
515B
555
206B
B
W
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| 352 |
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| FAN |
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| MOTOR |
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| 353 |
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| J7 |
390 | 392 | 265 | 1 |
263
2
262
3
267
4
GAS | 264 | 5 |
SOLENOID | 260 | 6 |
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| 7 |
261
8 
9 
10 
FOR TIMER
OPTION
SNUBBER
CONTROL BOARD
253
1 
252
2 
251
3 
552
4 
551
5 
256
6 
7 
J2
5508
254
9 
500
10 
11 
12 
13 
515
14 
1
2
3
4
5
J4
6
7
8
9
10 
206B 
1
W
2
3
B
4
J1
515B 
5
555 
6
WIRING
BOARD
1204
325 
7
R.F.
CHOKE
2 
208S
3 
208
4 
208R
J9
324 | 8 |
390 | 1 |
SECONDARY VOLTAGES SHOWN
D2
354 | 209R | 208R |
AS'BLY
J12 **
5 
204S
6 
209S
392 
2
J8
ARE NO LOAD RMS VALUES
BAFFLE MOUNTED
7 
209
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PM 255
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H5 | H2 | H4 | H3 | H1 |
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L1 | L2 |
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5
H1 H4
24
31
H1
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TO SINGLE PHASE |
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SUPPLY LINE |
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| TO GROUND PER |
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NATIONAL ELECTRICAL |
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| X8 | RECTIFIER |
| X8 | DIODE |
| 116.6V | BRIDGE |
| X9 |
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| X9 |
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| X5 |
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| X5 |
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| 14.2V |
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| X6 |
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| X6 |
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| 14.2V |
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| X7 |
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| X7 |
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H1 | X1 |
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| 28.4V |
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H2 |
| 204S |
H5 | X2 |
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H3 | X3 |
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| 28.4V |
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H4 | X4 |
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| POWER |
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| TRANSFORMER |
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| D1 |
+ |
208S
G1
SCR 1
SCR HEATSINK
ASBLY
SCR 2
G2
209S
206S 205
+ -
206B
2
W
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| 320 |
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| SCR HEATSINK |
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| ASSEMBLY |
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| J13 ** |
| W | THERMOSTAT |
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515B | R | 1 | T | P.M. | MOTOR/ |
555 | U | 2 | A |
| GEARBOX |
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206B | B | 3 | C |
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| 4 | H |
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| B |
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206
207
8209R
320B 
325B
OUTPUT CHOKE
THERMOSTAT
TO
WORK
FOR SPOOL GUN OPTION
SCI 
1
325A 
2
543
3
326
4
5
541A 
6
J3
SCI 
7
8
515
9 
206A 
10 
11 
12 
209
1 
208
2 
206
3 
206S 
4 
205
5 
6 
352
7 
X9 
8 
J5
354 
9
325B 
10 
GND 
11 
320
12 
207
13 
14 
353
15 
X8 
16 
G2 
1
204 
2
G1 
3
DIAGRAMS
C1 | C2 | C3 |
R1 | 15 OHMS | |
100 W | ||
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X7 
4
J6
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| + | + |
| + C1 THRU C3 |
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| 31,000 MFD |
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| 50V |
POWER FACTOR
ENHANCEMENT
CHOKE
204B
OUTPUT
CHOKE
R.F. FILTER | GND |
X6 
5
X5 
6
L10980