Lincoln Electric IM703-A manual Precision, Tig

PRECISION TIG 375 WIRING DIAGRAM FOR CODE 10894

F-3

CONTROL PANEL (VIEWED FROM REAR)

415 VOLT CONNECTION
CONNECT STRAP TO
HIGH (H4) (AS SHOWN)
380-400 VOLT CONNECTION	L1 (U)	H1
CONNECT STRAP TO
MID (H3)

306	1		1	301
303	2		2	304B
	3	METER	3
	4		4	302
	5		5
	6		6
	(VIEWED FROM REAR)
				L5
MINIMUM		DISPLAY		N.C.
OUTPUT

R4

	301	1
304B	302	2
	303	3
	304	4

J8

CONTROL PC BOARD

220-230 VOLT CONNECTION

L2 (V)

S1

CONNECT06/17/2002 STRAP TO

POWER SWITCH

PROTECTIVE BONDING CIRCUIT

LOW (H2)

250A

251A

220 VAC

220VAC

RECEPT.

H4

H3

H2

51

A

RECONNECT PANEL SUPPORT

L1 (U)

251

GND1

GND-H

GND-H2

GND4

GND5

GND6

C1

50

CB2

L1A

MID

250

5A

52

BYPASS

HIGH

LOW

C2

PC BOARD

50A

CONTROL

CASE

T1

TO GROUND PER

CASE

115 VAC

GAS

L2A

PANEL

FRONT

TRANS.

NATIONAL

BACK

RECEPT.

VALVE

L2 (V)

COM

C3

FOOT

ELECTRIC CODE

H1

GROUND

RECONNECT PANEL

S X5

267

POWER FACTOR

CAPACITORS

63.5VAC

H2 (220V)

F

STICK

TIG

MODE

316C

319

BALANCE

R2

311A 322

313C

314	320			321	316C	316B	315
		316B			313B
LOCAL				MAXIMUM
					OUTPUT
					R1
	317	316	316A	311A	311	312
REMOTE

POST FLOW

R3

		313A
316A	318	313

304A	5
306	6

311 1

L6 312 2

313 3

314 4

315 5

316 6

317 7

318 8

319 9

32010

32111

32212

J9

H3 (380V)

X6

268

J6

1

W 221

TO GROUND PER

250

H4 (415V)

S

X3

231

2

R 222

NATIONAL

H5 (440V)

115VAC

231A

L4

ELECTRICAL CODE

X9

S

231B

201

X4

232

216

X1

18VAC

L12

204

F

105VAC

X10

F

X14

52

SCR1

X1

X1

1

G1

G1

R222 W221

S

2

G3

(+)

W209

X7

S

78VAC

3

218

X1

20VAC

4

G4

POS

R210

F

X13

G2

X8

F

X2

J4

5

G2

SCR2

223

6

217

T1

7

220

L1

POLARITY SWITCH MICRO SWITCH

8

218

9

AC

A-C, D-E, B-F

OPEN

10

216

217

DC+

B-D, C-E, A-F, G-H

CLOSED

FRONT GANG

DC-

B-D, A-E, C-F, G-H

CLOSED

232

D

D2

REAR GANG MICRO-SWITCH

CB1 C8

115VAC

PRECISION

	(STICK)	(AUTO BAL)		(REMOTE)			(P. FLOW)	(THERMAL)
+ R -		+ G -		+ G -		+ G -		+	Y	-
B	W	B	W	B	W	B	W	B		W
	331		332		333		334		335

331	W	1
	B	6
332	W	2
	B	7
333	W	3
	B	8
334	W	4
	B	9
335	W	5
	B	10

L7

1

3 2

J10

	1	252	G3
	9	253
	2	269
	10	270	220
	3	271
	11	220B	220A
J11	6	265
	12	266	G4
	5	262
	13	263
	4	213
	14	214
	7	201	L13
	15	204

	B
SCR3	224
)-(
SCR4 D1
	NEG

C POS

252

E A

F

B X2

S2

POLARITY

SWITCH

253

NEG

286

H	S2A	NO
		NC
G
228	265A	266A
	265	266
(REAR VIEW, SHOWN
IN AC POSITION)

0 1

CR4

263

262

15A

	233
	233B
4	8
233A
CR4 2	6
	234

C9

231

50A

		SV2
N.D.	WATER VALVE
	(OPTIONAL)

TIG

	ADVANCED CONTROL PANEL
FREQ	ON TIME	BACKGROUND	DOWN SLOPE
R9	R10	R11	R12

5

4 6

J7

8	W209
16	R210
	225
	4

		R7	271A	BACKGROUND
		228		RECTIFIER	R8
			271	269		267
	225A
						268
224
	4	7			262

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
CB2	CIRCUIT BREAKER, 5 AMP
CR2,CR3	120V AC RELAY COIL
CR4	12V DC RELAY COIL

375

			401C
401B	402	403		401D	405	406	408	409	410			407	401D
																L10
4-STEP			401A	401B	ON		404	(PULSE ON)
411		401						-	G +	B
							W
2-STEP					OFF
TRIGGER				PULSE
																	1
																	2
																	3
																	4	J5A
																	5
																	7
																	6
																L9	8
													PROTECTION PCB
			A		A
			B		B										1		1
			C		C					A	4				2		2
			D		D			L8		B	1			J23	3		3
										C	2		J22		4		4
			E		E
10K A-B										D	3				5	N.A.	5	J5
AT MINIMUM			F		F					E	6				7		7
OPTIONAL										F	5				6		6
				REMOTE											8		8
REMOTE
	TM			RECEPTACLE
AMPTROL

				J3
1	06/3		4	5	6	7	8	9 10
	17/
	20
40102				1				PCB
403				3
402				2
404				4				OPTION
409				9
405				5
406				6
407				7
408				8
410				10				TIG
W				12
411				11
	J1
1	2	3	4	5	6	7	8	9 10
				J2

N.B.

							CR2	OCV BOOST
							7
								RECTIFIER
							227	R14	226
			CR3		AC BOOST			227A
		3			B	CR2 A
			9	258
		256					231C	231B
			CR2						FAN
		3	9	257		CR3
					B			260A
							A
		255			DC BOOST				FAN
							260
					233A
					GAS VALVE			SV1
							235
								231D
							231E
			L11
	1	256					115VAC	S
	2	260						T2
J12	3	235
	5	255
	6	236
	4	233A
							237	F
						236	R5	C7
							236B

		CR3				270		263
								201
						220B		204
			223					W209
						220A		R210
						220C
8	5
CR3			220C
						214	212	212
					S			S1A
231F 231E								MICRO-
		233A	231A	C		213		215 SWITCH
						TRANSFORMER
					BYPASS/	PRIMARY	TRANSFORMER
						THERMOSTAT
					STABILIZER		SECONDARY
							THERMOSTAT
					PC BOARD
								223
		HI-FREQ						231B
	R13 INTENSITY							233A
	238A			E	F			231A
		240
L2	238	C6
			T3		R6
SPARK
GAP						N.A. CONNECTION IS PIN TO PIN BETWEEN J23 AND J5.
				284	285
L3	239					N.B. ROBOTIC INTERFACE CONNECTION.
						N.C. DISPLAY TOGGLE SHOWN IN MIN AMP POSITION.
						N.D. PLUGS INTO LOWER SWITCHED RECEPTACLE.
				FRONT	WORK
				ELECTRODE
ARC STARTER AS’BLY
			REAR
			ELECTRODE

	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
	LEAD COLORING CODE:					COMPONENT VALUE
						UNITS:
	B-BLACK			U-BLUE		RESISTORS:
	G-GREEN			W-WHITE			OHMS/WATTS
	O-ORANGE Y-YELLOW					CAPACITORS:
	R-RED						MFD/VOLTS
	CONNECTOR PIN NUMBERS:
1 2 3				7	EXAMPLE: THIS IS PIN 7
					0F CONNECTOR J5
8		J5		14		1 2 3		8
				LATCH

VIEW OF CONNECTOR ON PC BOARD ELECTRICAL SYMBOLS PER E1537.

A

WIRING DIAGRAM ENHANCED DIAGRAMS

G4047-2

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.

F-3