Lincoln Electric IM703-A Welding System User Manual


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F-2
WIRING DIAGRAM
F-2
PRECISION TIG 375
RECEPTACLE
C
A
B B
CONTROL PC BOARD
10K A-B
F
E
D
C
AT MINIMUM
D
F
A
E
REMOTE
A
B
C
D
E
F
R4
R1R2
BALANCE
MINIMUM
OUTPUT
MAXIMUM
OUTPUT
MODE
REMOTE
R3
POST FLOW
319
5
4
3
2
1
322
316C
313C
316B
315
316
317
311
312
313
318
313A
313B
TIG
STICK
8
4
1
2
3
6
5
6
321
12
11
10
9
8
6
5
4
3
1
2
6
5
4
3
2
1
2
3
4
5
7
1
5
4
3
2
1
6
6
301
303
304B
306
302
METER
(VIEWED FROM REAR)
DISPLAY
314
320
LOCAL
311A
316A
8
7
6
5
4
3
2
1
J23
J22
7
316C
301
302
303
304
304A
306
304B
321
322
313
314
315
316
317
318
319
320
311
312
J8
J9
2
1
W 221
R 222
11
3
10
2
269
270
271
220B
6
5
4
3
2
1
233A
235
16
8
15
7
14
4
13
5
12
6
9
1
J11
L8
J5
J12
J6
N.A.
8
6
2
3
4
5
7
1
J5A
N.B.
255
256
256
260
255
236
PROTECTION PCB
R12
R11
R10
R9
FREQ
ON TIME
DOWN SLOPE
BACKGROUND
401D
PULSE
2-STEP
402
403
405
406
401
408
409
410
401B
407
ADVANCED CONTROL PANEL
404
ON
OFF
401C
411
401A
401D
VIEW OF CONNECTOR ON PC BOARD
ELECTRICAL SYMBOLS PER E1537.
OHMS/WATTS
COMPONENT VALUE
UNITS:
RESISTORS:
MFD/VOLTS
CAPACITORS:
8
LATCH
0F CONNECTOR J5
EXAMPLE: THIS IS PIN 7
32
LEAD COLORING CODE:
B-BLACK
21
8
G-GREEN
O-ORANGE
R-RED
CONNECTOR PIN NUMBERS:
7
14
U-BLUE
Y-YELLOW
W-WHITE
1
3
J5
C1
RECONNECT PANEL
H4 H2
H3
H1
CAPACITORS
POWER FACTOR
C2
A
HIGH
MID
LOW
COM
251
232
H4 (575V)
F
W209
18VAC
X7
R210
201
X8
F
S
X5
X2
X1
T1
78VAC
S
204
115VAC
X9
X10
20VAC
X3
H3 (460V)
H2 (230V)
X6
262
263
63.5VAC
267
268
CR4
231A
231
115VAC
X4
CB1
15A
232
231
F
S
F
S
F
S
CR4
233B
234
48
2
6
233
0
1
233A
X13
223
231B
C8
C9
R8
267
233A
231A
268
269
220B
271
270
220A
262
263
201
204
W209
220C
231B
115VAC
ARC STARTER AS’BLY
R5
SV1
GAS VALVE
L3
C6
T2
C7
T3
GAP
SPARK
L2
237
S
F
R6
BYPASS/
STABILIZER
PC BOARD
FAN
260
235
233A
239 238
284 285
236B
236
231D
231E
5
8
CR3
CR2
258
257
CR3
CR2
231C
3
9
B
A
B
A
FAN
231A
231E
231B
233A
255
256
CR3CR3
CR3
220C
AC BOOST
DC BOOST
3
9
260A
231F
R13
HI-FREQ
INTENSITY
238A
240
POS
D
FRONT GANG
NEG
POLARITY SWITCH MICRO SWITCH
POLARITY
S2
NO
(REAR VIEW, SHOWN
X2
NC
MICRO-SWITCH
CLOSED
CLOSED
OPEN
TO GROUND PER
C
A-C, D-E, B-F
B-D, C-E, A-F, G-H
G
DC+
REAR GANG
DC-
2
6
6
A
S2A
2
6
5
A
H
A
L1
AC
SWITCH
E
F
ELECTRICAL CODE
NATIONAL
2
5
3
POS
B-D, A-E, C-F, G-H
IN AC POSITION)
D2
B
2
5
2
R7
2
8
6
W
2
2
1
R
2
2
2
271A
2
2
8
2
2
8
BACKGROUND
RECTIFIER
2
6
5
2
6
6
47
5
8
7
4
R14
2
2
3
2
2
4
226
225
227
CR2
CR3
225A
2
2
8
227A
OCV BOOST
RECTIFIER
213
214
201
204
W209
R210
262
263
265
266
252
253
G1
G2
217
216
220
G3
2
2
0
A
G4
218
SCR4
D1
X1
N
E
G
SCR3
POS
(+)
SCR1
SCR2
2
5
2
(-)
B
2
2
4
G4047-1
3-8-2002A
PRECISION TIG 375 WIRING DIAGRAM FOR CODE 10810
L9
L10
L6
L5
L4
L13
L11
411
W
403
404
405
406
407
408
409
410
401
402
TIG OPTION PCB
J1
03/
09/
20
02
1 3456 89
10
7
21 3456 89
10
7
J2
575 VOLT CONNECTION
CONNECT STRAP TO
HIGH (H4) (AS SHOWN)
460 VOLT CONNECTION
CONNECT STRAP TO
MID (H3)
230 VOLT CONNECTION
CONNECT STRAP TO
LOW (H2)
C3
FRONT
ELECTRODE
REAR
ELECTRODE
WORK
212214
213
215
TRANSFORMER
PRIMARY
THERMOSTAT
TRANSFORMER
SECONDARY
THERMOSTAT
MICRO-
SWITCH
223
4-STEP
TRIGGER
4
0
1
B
3
1
1
A
3
1
6
A
3
1
6
B
F
C
S
E
N.C.
CONTROL PANEL (VIEWED FROM REAR)
+
-
GR
G
Y
(STICK)
(AUTO BAL) (REMOTE)
(P. FLOW)
(THERMAL)
B
W
+
-
B
W
+
-
B
W
+
-
B
W
+
-
G
3
3
1
5
9
8
3
7
2
1
6
4
331
10
J10
L7
3
3
2
3
3
3
B
W
3
3
4
3
3
5
B
W
332
B
W
333
B
W
334
B
W
335
B
W
12
11
10
9
8
6
5
4
3
1
2
7
REMOTE
TM
AMPTROL
OPTIONAL
L1 (U)
L2 (V)
C5
C4
GROUND
2
5
0
A
2
5
1
A
S1A
H1
S1
POWER SWITCH
L1 (U)
L2 (V)
X1
X1
212
8
7
6
5
4
3
2
1
220
G1
217
J4
5
2
1
3
J7
G4
G3
G2
L12
6
4
10
9
216
218
250
J3
C1,C2,C3 POWER FACTOR CAPACITORS, 60/460
C4,C5 BY-PASS CAPACITORS, .0047
C6 HIGH VOLTAGE CAPACITOR, .0015/12kV
C7 PHASE SHIFT CAPACITOR, 15uF/250VAC
C8,C9 HIGH FREQ PROTECTION CAPACITORS, .22/400
CB1 CIRCUIT BREAKER, 15 AMP
CR2,CR3 120V AC RELAY COIL
CR4 12V DC RELAY COIL
D1 FREE WHEELING DIODE
D2 BACKGROUND DIODE
L1 OUTPUT INDUCTOR (CHOKE)
L2,L3 HIGH FREQ INDUCTORS
L4 -L13 RF TOROID CHOKES
R1 OUTPUT CONTROL POTENTIOMETER, 10K
R2 BALANCE CONTROL POTENTIOMETER, 10K
R3 POST FLOW POTENTIOMETER, 10K
R4 MIN OUTPUT POTENTIOMETER, 10K
R5 PHASE SHIFT RESISTOR, 200/100
R6 HOLDING RESISTOR, 50/225
R7 RESISTOR, 20/100
R8 RESISTOR, 5/50
R9 FREQ CONTROL POTENTIOMETER, 10K
R10 ON TIME CONTROL POTENTIOMETER, 10K
R11 BACKGROUND POTENTIOMETER, 10K
R12 DOWN SLOPE POTENTIOMETER, 10K
R13 HIGH FREQ INTENSITY CONTROL, 3/25
R14 RESISTOR, 8/300
S1 INPUT POWER SWITCH
S1A MICROSWITCH ON INPUT POWER SWITCH
S2 POLARITY SWITCH
S2A MICROSWITCH ON POLARITY SWITCH
SCR1,2,3,4 MAIN POWER SCR’S
SV1 GAS SOLENOID VALVE, 115VAC
SV2 WATER SOLENOID VALVE, 115VAC (OPTIONAL)
T1 MAIN TRANSFORMER
T2 HIGH VOLTAGE TRANSFORMER
T3 HIGH FREQ TRANSFORMER
N.A. CONNECTION IS PIN TO PIN BETWEEN J23 AND J5.
N.B. ROBOTIC INTERFACE CONNECTION.
N.C. DISPLAY TOGGLE SHOWN IN MIN AMP POSITION.
N.D. PLUGS INTO LOWER SWITCHED RECEPTACLE.
SV2
WATER VALVE
(OPTIONAL)
N.D.
R210
G
(PULSE ON)
+
-
W
B
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted
inside the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. Give the equipment code number.
ENHANCED DIAGRAMS
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