ELECTRICAL DIAGRAMS
PRECISION TIG 375
SCHEMATIC - ENTIRE MACHINE - BELOW CODE 11000 (G4075)
XB-UF
01-29-02
NONE
MACHINE SCHEMATIC
PRECISION TIG
4075
TN
TN
3-8-2002A
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OWNED BY LINCOLN GLOBAL, INC. AND MAY NOT BE DUPLICATED, COMMUNICATED
TO OTHER PARTIES OR USED FOR ANY PURPOSE WITHOUT THE EXPRESS WRITTEN PERMISSION OF LINCOLN GLOBAL, INC.
PROPRIETARY & CONFIDENTIAL:
EN
-17
0
UNLESS OTHERWISE SPECIFIED TOLERANCE
MANUFACTURING TOLERANCE PER E2056
ON 2 PLACE DECIMALS IS ± .02
ON 3 PLACE DECIMALS IS ± .002
ON ALL ANGLES IS ± .5 OF A DEGREE
MATERIAL TOLERANCE (" ") TO AGREE
t
WITH PUBLISHED STANDARDS.
DO NOT SCALE THIS DRAWING
DRAWN BY:
ENGINEER:
DESIGN INFORMATION
APPROVED:
REFERENCE:
SUPERSEDING:
EQUIPMENT TYPE:
SUBJECT:
SCALE:
DATE:
DRAWING No.:
G
SO
LI
D
ED
G
E
"X" INFO Chg. Sheet No.
SCR4
SCR1
SCR3
SCR2
MAIN
RECTIFIER
D1
OUTPUT
INDUCTOR
AC
DC
DC
DC
DC
AC
AC
AC
+
+
-
-
RECEPTACLE
R1
POLARITY
SWITCH
SHUNT
FRONT
WORK
SV1
GAS
SOLENOID
CB1
115V/15A
FAN
X3
X4
250
SEE NOTE A
MAIN
TRANSFORMER
RECONNECT
PANEL
X2
X1
H1
H2
H3
H4
L2
L1
ELECTRICAL SYMBOLS PER E1537
+
-
TM
CLOSED
IN DC
REMOTE
HIGH FREQ.
TRANSFORMER
115 V
RECEPTACLE
3KV
.0047/
400A/200mV
S2
50/100
OPTIONAL AMPTROL REMOTE
CONTROL AND ARC START SWITCH
T2
S
F
C6
.0015/12KV
50/60HZ MACHINES ONLY
C4
C5
C1
C3
SPARK
GAP
R5
200/100
LEAD #250 CONNECTS TO "HIGH" TERMINAL ON
FROM MAIN TRANSFORMER (T1)
RECONNECT PANEL, ALONG WITH CORRECT LEAD
208/230/460
LEAD #250 CONNECTS TO THE H5 LEAD OF
THE MAIN TRANSFORMER (T1)
230/460/575
LEAD #250 CONNECTS TO THE "MID" TERMINAL
ON THE RECONNECT PANEL, ALONG WITH CORRECT
LEAD FROM THE MAIN TRANSFORMER (T1)
NOTE A:
CONNECTS ACCORDING TO THE INPUT VOLTAGE
LEAD #250 FROM POWER FACTOR CAPACITORS
B-BLACK
R-RED
Y-YELLOW
G-GREEN
U-BLUE
W-WHITE
COMPONENT VALUE
UNITS:
CAPACITORS:
MFD/VOLTS
RESISTORS:
OHMS/WATTS
LEAD COLORING CODE:
CONNECTOR PIN NUMBERS:
VIEW OF CONNECTOR ON PC BOARD
1 2 3
8
9
16
LATCH
EXAMPLE: THIS PIN IN
CONNECTOR J11 IS "6J11"
O-ORANGE
C7
15/250
220V 2A
RECEPTACLE
CB2
220V/5A
H5
HIGHVOLTAGE
TRANSFORMER
H1
220/380/415
L1
L2
L3
C2
T3
24
0
23
8A
PRESENT ONLY ON
PRECISION TIG 375
R13
HI-FREQ INTENSITY
REAR
ELECTRODE
(STICK WELDING)
(TIG WELDING)
HOLDING RESISTOR
COOLER
RECEPTACLE
(BOTTOM)
(TOP)
23
1A
23
1B
231A
23
1D
FAN
23
1E
231F
260A
PRECISION
TIG 375 ONLY
X13
R14
CR2
C8
C9
.22/400V
.22/400V
CR4
233B
234
(12VDC)
COOLER RELAY
233
232
231
236B
237
238
239
225A
228
DC+
DC-
DC+
DC-
224
CR3
22
3
226
227A
CR3
22
3
22
7
225
CR2
CR3
258
256
257
CR3
CR2
255
231C
STICK OCV BOOST CIRCUIT,
PRESENT ONLY ON PRECISION TIG 375
OCV BOOST
RECTIFIER
AC
BOOST
DC
BOOST
271A
220C
220A
220B
268
R8
5/50
R7
20/100
D2
286
DC TIG BACKGROUND
CIRCUIT
267
X5
X6
63.5V
268
267
269
27
0
BACKGND AC IN (63.5VAC)
271
1J4
5J4
G1
G2
G3
G4
218
217
216
220
SCR1,SCR2 CATHODE
SCR3 CATHODE
SCR4 CATHODE
SCR3,SCR4 ANODE
SCR1 GATE
SCR2 GATE
SCR3 GATE
SCR4 GATE
216
G4
G1
G2
G3
220
217
218
220A
FREE WHEELING DIODE
1J12
5J12
115VAC IN AC STICK
115VAC IN DC STICK
2J4
4J4
9J4
6J4
10J4
7J4
BACKGND AC OUT (63.5VAC) IN DC TIG
BACKGND FILTER CAP., POS
BACKGND FILTER CAP., NEG
3J11
11J11
2J11
10J11
BACKGND DIODE
BACKGND RESISTOR
BACKGND TRIAC
CURRENT LIMITING RESISTOR
BACKGND RECTIFIER
X14
231B
23
1E
236
TOROID
TOROID
HI-FREQ (115VAC)
GAS (115VAC)
FAN (115VAC)
235
260
265
266
252
253
MICRO SWITCH ON POLARITY SWITCH
VOLT FEEDBACK, ELECTRODE
VOLT FEEDBACK, WORK
265
266
252
253
MICRO SWITCH ON POLARITY SWITCH
TOROID
6J11
12J11
1J11
9J11
POWER SWITCH
MICRO SWITCH
215
212
212
21
5
PRECISION TIG 375
ONLY
PRECISION TIG 375
ONLY
PRECISION TIG 275 ONLY
262
263
214
213
TSTAT
TSTAT
COOLER, +12VDC IN TIG WELDING
COOLER, COMMON
262
263
5J11
13J11
4J11
14J11
TOROID
233A
235
233A
260
233A
115VAC IN
6J12
3J12
2J12
4J12
TOROID
X7
X8
X9
X10
20VAC
CONTROL BOARD SUPPLY
20VAC
TRIGGER CIRCUIT
8J11
16J11
7J11
15J11
209
210
201
204
AUX. WINDINGS OF
MAIN TRANSFORMER T1
PRIMARY TSTAT
SECONDARY TSTAT
(OF MAIN TRANSFORMER T1)
3J4
8J4
X
X
TOROID
R 222(-)
W 221(+)
W 221
R 222
SHUNT (+)
SHUNT (-)
1J6
2J6
TOROID
+5V
DECIMAL PT. IN
IN (+)
COM
IN (-)
DECMAL PT.OUT
1J8
2J8
3J8
4J8
5J8
6J8
301
302
303
304
304A
306
TOROID
5
4
3
2
1
5
4
3
2
1
6
6
301
303
304B
306
302
METER
(VIEWED FROM REAR)
304B
R1
311
312
313
+10V
COM
PRESET (0 - 10V)
1J9
2J9
3J9
MAX
OUTPUT
CW
MIN
OUTPUT
CW
313B
314
320
MIN OUTPUT (0 - 1.5V)
+1.5V
R4
CW
CW
R2
CW
BALANCE
313C
311A
322
12J9
4J9
10J9
BALANCE (0 - 10V)
316
317
LOCAL
REMOTE
316
317
6J9
7J9
+15V
REMOTE (+15V)
CW
R3
CW
A
MIN A
VOLT
DISPLAY SWITCH
31
6B
316C
321
315
319
STICK
TIG
MODE SWITCH
316A
31
3A
321
315
319
318
11J9
5J9
9J9
8J9
STICK (+15V)
POSTFLOW (0 - 15V)
TOROID
STICK
AUTO BALANCE
REMOTE
(RED)
(GREEN)
(GREEN)
GAS
(GREEN)
THERMAL
(YELLOW)
B
W
B
W
B
W
B
W
331
332
333
B
W
334
335
331
331
332
332
333
333
334
334
335
335
B
W
B
W
B
W
B
W
B
W
6J10
1J10
7J10
2J10
8J10
3J10
9J10
4J10
10J10
5J10
TOROID
LED LIGHTS
R
9
CW
CW
R
10
FREQUENCY
ON TIME
CW
R
12
DOWN SLOPE
401C
401D
402
403
405
406
407
CW
R1
1
BACK GROUND
B
W
PULSE
ON
OFF
TRIGGER
4-STEP
2-STEP
40
1B
40
4
401A
41
1
40
1
408
409
410
FREQ. (.08 - 15V)
402
403
405
406
407
PULSE
(GREEN)
ON TIME (1-15V)
DOWNSLOPE
2J1
3J1
5J1
6J1
7J1
404
401
411
W
PULSE ON (15V)
+15V
2-STEP (15V)
PULSE LED
8J1
9J1
10J1
4J1
1J1
11J1
12J1
TOROID
A
B
C
D
E
F
U
N
R
B
W
10K
PROTECTION
PCB
4J22
1J22
2J22
3J22
6J22
5J22
A
B
C
D
E
F
2J5
3J5
4J5
5J5
7J5
6J5
8J5
1J5
TOROID
TOROID
2J23
3J23
4J23
5J23
7J23
1J23
2J5A
3J5A
4J5A
5J5A
7J5A
1J5A
6J5A
8J5A
MOVE THIS PLUG FROM
J5 TO J5A FOR ROBOTIC INTERFACE
ADVANCED CONTROL
PCB
(OPTIONAL ON PT275)
J2
J3 1 2 3 4
WHEN ADVANCED CONTROL
PCB IS NOT INSTALLED
DISCONNECT FOR
DOUBLE PRE/POST FLOW
DIP
SW
ITC
H
(A
DV
AN
CE
D
FE
ATU
RE
S
SE
LE
C
TIO
N)
HOT START TRIMMER
ARC FORCE TRIMMER
( SCHEMATIC G3908-X)
(SCHEMATIC G4039-X)
(SCHEMATIC S22530)
BYPASS/STABILIZER
PCB
(SCHEMATIC M16115)
ADVANCED CONTROL PANEL (OPTIONAL ON PT275)
1J7
3J7
2J7
5J7
4J7
6J7
PT375 ONLY
CONTROL PCB
POST FLOW
8/300
10K
10K
10K
10K
10K
10K
10K
10K
LOW
MID
HIGH
SV2
SOLENOID
OPTIONAL
WATER
PLUGGED TO
COOLER RECEPTACLE
(SHOWN IN REMOTE)
(SHOWN IN STICK)
DISPLAY VOLT (+15V)
DISPLAY MIN A (+15V)
313A
31
8
CONTROL PANEL
(SHOWN IN 2-STEP)
(SHOWN PULSE ON)
MAX
WIPER
MIN
PT375 ONLY
N.O.
N.C.
115VAC
105VAC
3/25
(115VAC)
TOP FAN
BOTTOM FAN
(115VAC)
(115VAC)
(115VAC)
5.5 OHMS
TYP.
14.5 KOHMS
TYP.
12.5 OHM TYP.
12.5 OHM TYP.
KIT
ELECTRODE
T1
T1
T1
T1
223
205mV BETWEEN
IN(+) & IN(-) IS
205A OR 20.5V
IN(+)
IN(-)
HI-FREQ CIRCUIT
460/575
LEAD #250 CONNECTS TO THE "LOW" TERMINAL
ON THE RECONNECT PANEL, ALONG WITH CORRECT
LEAD FROM THE MAIN TRANSFORMER (T1)
POWER FACTOR
CAPACITORS
PT375: STANDARD, C1=C2=C3=60/460
PT275: OPTIONAL, C1=C2=50/460
C3 NOT PRESENT
313
BYPASS PCB
L1A
L2A
50/60HZ MACHINE ONLY
BYPASS ASSEMBLY
50HZ MACHINE ONLY
SCHE. S24206-X
NOTE:
This diagram is for reference only. It may not be accurate for all machines covered by this manual.
G-7
G-7