Lincoln Electric IM703-A manual Mid

PRECISION TIG 375 WIRING DIAGRAM FOR CODE 10810

CONTROL PANEL (VIEWED FROM REAR)

F-2

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

	L1 (U)			H1		575 VOLT CONNECTION
	L2 (V)					CONNECT STRAP TO
			S1			HIGH (H4) (AS SHOWN)
						460 VOLT CONNECTION
		POWER SWITCH
			A	250A	251A	CONNECT STRAP TO
	H4	H3	H2			MID (H3)
L1 (U)			250	C1	251	230 VOLT CONNECTION
		MID
C5						CONNECT STRAP TO
	HIGH		LOW	C2		LOW (H2)
C4
L2 (V)		COM		C3	H1
GROUND	RECONNECT PANEL
				POWER FACTOR
				CAPACITORS		X5	267
					S

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

J6 1 W 221

2 R 222

L4

		L12
	1	G1
	2	G3
	3	G4
	4
J4	5	G2
	6	217
	7	220
	8	218
	9
	10	216

216

G1

218

G2

217

X1

SCR1 (+)

POS

SCR2

W 221

R 222

L1

FRONT GANG

			H2 (230V)			63.5VAC
		TO GROUND PER	H3 (460V)			F	X6	268
		NATIONAL	H4 (575V)			S	X3	231
		ELECTRICAL CODE		X9	S	115VAC		231A
			201			F		231B
				18VAC			X4	232
			204		F
				X10
X1							X1
						S
			W209	X7	S	78VAC
X1				20VAC
			R210		F		X13
				X8		F
							X2	223
					T1
POLARITY SWITCH MICRO SWITCH
AC	A-C, D-E, B-F	OPEN
DC+	B-D, C-E, A-F, G-H	CLOSED
DC- B-D, A-E, C-F, G-H		CLOSED	232

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

J7

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

G3

220

220A

G4

L13

B

D

D2

REAR GANG

MICRO-SWITCH

CB1

C8

115VAC

C9

SCR3

H

S2A

NO

15A

E

A

NC

233

224

231

F

NEG

G

233B

C

266A

4

8

SCR4

D1

286

228

265A

262

233ACR4 2

6

)-(

POS

0

CR4

1

N.D.

B

X2

S2

265

266

263

234

SV2

NEG

POLARITY

253

(REAR VIEW, SHOWN

WATER VALVE

252

SWITCH

(OPTIONAL)

IN AC POSITION)

TIG

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

5

4 6

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
CR2,CR3	120V AC RELAY COIL
CR4	12V DC RELAY COIL
D1	FREE WHEELING DIODE

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
				RECEPTACLE
	TM
AMPTROL

				J3
1	03/3		4	5	6	7	8	9 10
	09/
	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
								260A	FAN
		255			DC BOOST
					B		A
							260
					233A
					GAS VALVE			SV1
							235
							231E	231D
			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

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.
							3-8-2002A

WIRING DIAGRAM ENHANCED DIAGRAMS

G4047-1

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-2