Lincoln Electric IM702-A Welding System User Manual


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F-2
WIRING DIAGRAM
F-2
PRECISION TIG 275
RECEPTACLE
C
A
B B
CONTROL PC BOARD
10K A-B
F
E
D
C
AT MINIMUM
D
F
REMOTE
TM
AMPTROL
OPTIONAL
A
E
REMOTE
A
B
C
D
E
F
+
-
GR
G
Y
5
4
3
2
1
(STICK)
(AUTO BAL) (REMOTE)
(P. FLOW)
(THERMAL)
8
4
1
2
3
6
5
6
B
W
+
-
B
W
+
-
B
W
+
-
B
W
+
-
G
331
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)
8
7
6
5
4
3
2
1
J23
J22
301
302
303
304
304A
306
304B
321
322
313
314
315
316
317
318
319
320
311
312
J8
J9
5
9
8
3
7
2
1
6
4
331
10
411
W
403
404
405
406
407
408
409
410
401
402
TIG OPTION PCB
(OPTIONAL)
8
7
6
5
4
3
2
1
220
G1
217
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
J10
J1
J5
J12
J4
J6
N.A.
8
6
2
3
4
5
7
1
J5A
N.B.
260
236
5
2
1
3
J7
PROTECTION PCB
R12
R11
R10
R9
FREQ
ON TIME
DOWN SLOPE
BACKGROUND
401D
402
403
405
406
408
409
410
401B
ADVANCED CONTROL PANEL
(OPTIONAL)
401C
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
575 VOLT CONNECTION
CONNECT STRAP TO
HIGH (H4) (AS SHOWN)
232
H4 (575V)
F
W209
18VAC
X7
R210
201
X8
F
S
X5
X2
X1
T1
78VAC
S
204
115VAC
X9
X10
20VAC
X3
H2 (460V)
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
C8
C9
214
213
R8
267
233A
231A
268
269
220B
271
270
220A
262
263
201
204
W209
R210
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
231A
231E
233A
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
BACKGROUND
RECTIFIER
2
6
5
2
6
6
G4
G3
G2
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
G4031-1
B
PRECISION TIG 275 WIRING DIAGRAM FOR CODE: 10807
L9
L10
L7
L6
L5
L12
L4
L13
L11
J3
N.D.
N.C.
L1 (U)
L2 (V)
C1
RECONNECT PANEL
H4
H2
H1
250
S1
POWER SWITCH
H1
C5
C4
CAPACITORS
(OPTIONAL)
POWER FACTOR
C2
A
GROUND
HIGH
MID
LOW
COM
251
21 3456 89
10
7
21 3456 89
10
7
J2
J3
21 3456 89
10
7
OR
N.C.
460 VOLT CONNECTION
CONNECT STRAP TO
LOW (H2)
4
0
7
L1 (U)
L2 (V)
FRONT
ELECTRODE
REAR
ELECTRODE
WORK
TRANSFORMER
PRIMARY
THERMOSTAT
TRANSFORMER
SECONDARY
THERMOSTAT
PULSE
2-STEP
4
0
1
4
0
4
ON
OFF
4
1
1
4
0
1
A
4-STEP
TRIGGER
4
0
1
B
R4
R1R2
BALANCE
MINIMUM
OUTPUT
MAXIMUM
OUTPUT
MODE
REMOTE
R3
POST FLOW
3
1
9
3
2
2
3
1
6
C
3
1
3
C
3
1
6
B
3
1
5
3
1
6
3
1
7
3
1
1
3
1
2
3
1
3
3
1
8
313B
TIG
STICK
3
2
1
DISPLAY
3
1
4
3
2
0
LOCAL
3
1
1
A
3
1
6
A
3
1
6
C
3
1
1
A
3
1
6
A
3
1
6
B
F
C
S
E
N.E.
CONTROL PANEL (VIEWED FROM REAR)
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
12
11
10
9
8
6
5
4
3
1
2
7
6
4
10
9
216
218
C1,C2
POWER FACTOR CAPACITORS, 50/460 (OPTIONAL)
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
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
S1 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. REMOVE JUMPER PLUG IN J3 WHEN INSTALLING
TIG OPTION PC BOARD.
N.D. DISCONNECT JUMPER LEAD BETWEEN PIN 1 AND
PIN 2 IN J3 TO DOUBLE PREFLOW & POSTFLOW TIMES.
N.E. DISPLAY TOGGLE SHOWN IN MIN AMP POSITION.
N.F. PLUGS INTO LOWER SWITCHED RECEPTACLE.
SV2
WATER VALVE
(OPTIONAL)
N.F.
G
(PULSE ON)
+
-
W
B
313A
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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