Lincoln Electric IM702-A manual SCR3

PRECISION TIG 275 WIRING DIAGRAM FOR CODE: 10807

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				N.E.
OUTPUT		DISPLAY

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

STICK

TIG

MODE

316C

319

BALANCE

R2

313C

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

POST FLOW

R3

	313A
316A	318

	304A	5
	306	6
L6	311	1
	312	2
	313	3
	314	4
	315	5
	316	6
	317	7
	318	8
	319	9
	320	10
	321	11
	322	12

J9

J6 1 W 221

2 R 222

L4

L12

1 G1

2 G3

3

4 G4

J4 5 G2

6 217

7 220

8

216

X1

218	SCR1	R222 W221
	POS
G1	(+)
G2	SCR2
		L1

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

316 311 312

313

W	1
331

9 218

10216

217

G3

B

SCR3

FRONT GANG
D
E	A

DC- B-D, A-E, C-F, G-H		CLOSED	232
					115VAC
D2	REAR GANG	MICRO-SWITCH	CB1	C8
					C9
	S2A NO		15A
	H	NC		233

	(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

	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

N.D.

N.C.

1	252
9	253
2	269
10	270
3	271
11	220B

220

220A

G4

)-( D1

SCR4

NEG

F
C
POS
B	X2

	S2
252	POLARITY	253
	SWITCH

	NEG	G							233B	231
			266A					4	8
286		265A		0	1		233A			N.F.
				CR4
								2	6
						262	CR4
		265	266	263					234
										SV2
		(REAR VIEW, SHOWN								WATER VALVE
										(OPTIONAL)
		IN AC POSITION)

		ADVANCED CONTROL PANEL
			(OPTIONAL)
	ON TIME			BACKGROUND	DOWN SLOPE
FREQ

5

4

6

J3

1 2 3 4 5 6 7 8 9 10

	6	265
J11	12	266
	5	262
	13	263
	4	213

R7	271A	BACKGROUND
		RECTIFIER	R8
	271	269		267

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

PRECISION TIG 275

	R9			R10			R11				R12
			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
																5 J5A
																7
																6
																8
												PROTECTION PCB			L9
			A		A
			B		B									1		1
			C		C			L8		A	4			2		2
			D		D					B	1		J23	3		3
										C	2	J22		4		4	J5
			E		E
10K A-B										D	3			5	N.A.	5
AT MINIMUM			F		F					E	6			7		7
OPTIONAL										F	5			6		6
				REMOTE										8		8
REMOTE
				RECEPTACLE
	TM
AMPTROL

OR N.C.

J3

1 2 3 4 5 6 7 8 9 10

401	1	OPTIONTIG PCB (OPTIONAL)
402	2
403	3
W	12
404	4
405	5
406	6
407	7
408	8
409	9
410	10
411	11
	J1

1 2 3 4 5 6 7 8 9 10

J2

N.B.

14	214
7	201	L13
15	204
8	W209
16	R210

					FAN						S
								233A	231A	C
						231E					BYPASS/
				260							STABILIZER
			233A								PC BOARD
			GAS VALVE		SV1
				235
					231D
				231E
										E	F
			L11
					S	L2	238	C6
	1	260		115VAC					T3		R6
	2				T2	SPARK
J12	3	235				GAP
	5
		236
	6									284	285
	4	233A				L3	239
				237	F
			236							FRONT	WORK
				R5	C7	ARC STARTER AS’BLY				ELECTRODE
				236B						REAR

	268
270	262
	263
	201
220B	204
	W209
220A	R210

214

213

TRANSFORMER

PRIMARY

THERMOSTAT TRANSFORMER

SECONDARY

THERMOSTAT

233A

231A

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.

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
	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.

WIRING DIAGRAM ENHANCED DIAGRAMS

ELECTRODE

B

G4031-1

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