Lincoln Electric PRECISION TIG 375 Service Manual page 116

G-4
WIRING DIAGRAM - ENTIRE MACHINE - CODE 10894 (G4047-2)
CONTROL PANEL (VIEWED FROM REAR)
1 1
306
2 2
303
3 3
METER
4 4
5 5
6 6
(VIEWED FROM REAR)
MINIMUM
OUTPUT
DISPLAY
R4
313B
MAXIMUM
STICK BALANCE LOCAL
OUTPUT
R2 R1
TIG REMOTE
MODE
(STICK)
(AUTO BAL) (REMOTE) (P. FLOW)
+ - + - + - +
R G G G
B B B B
W W W
ADVANCED CONTROL PANEL
FREQ ON TIME BACKGROUND
R10 R11
R9
401C
(PULSE ON)
4-STEP ON
-
G
W
2-STEP OFF
PULSE
TRIGGER
A A
B B
C C
D D L8
E E
10K A-B
AT MINIMUM
F F
OPTIONAL
REMOTE
REMOTE
RECEPTACLE
AMPTROL TM
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.
PRECISION TIG 375 WIRING DIAGRAM
301
304B
302
CONTROL PC BOARD
L5
N.C.
1
301
2
302
3
303
J8
4
304
304A 5
6
306
311 1
L6 312 2
313 3
314 4
315 5
POST FLOW
316 6
J9
317 7
318 8
R3
319 9
320 10
321 11
313A
322 12
W 1
331
B 6
(THERMAL)
W 2
-
332
Y B 7
W 3
W B W J10
333
B 8
W 4
334
B 9
W 5
335
B 10
L7
1
3
2
J7
5
4
6
DOWN SLOPE
R12
J3
1 06/ 3 4 5 6 7 8 9 10
17/
20
02
401 1
L10 402 2
403
3
404
4
405
5
+
B
406 6
407 7
408 8
409 9
410 10
411
11
W
12
J1
1 1 2 3 4 5 6 7 8 9 10
2
3
J2
4
J5A
5
7
6
8
N.B.
L9
PROTECTION PCB
1
1
2
A 2
4
3
B 3
1
4
C 2 J23 4
J22
5
D 3 5 J5
N.A.
7
E 6 7
F 5 6
6
8
8
ELECTRICAL DIAGRAMS
PROTECTIVE BONDING CIRCUIT
RECONNECT PANEL SUPPORT
GND1 GND-H GND-H2 GND4
CONTROL CASE T1 TO GROUND PER
PANEL FRONT TRANS. NATIONAL
FOOT ELECTRIC CODE
1
W 221
J6
2
R 222
L4
216
X1
L12
SCR1
1 G1
G1
2 G3
3
218
4 G4
5 G2 G2
J4
6 217 SCR2
7 220
8
9 218
10 216
217
1 252
253 G3
9
SCR3
2 269
10 270
220
3 271
11 220B
6 265
SCR4 D1
J11
12 266
G4
5
262
263
13
4 213
14 214
7
201
15 L13
204
8 W209
16 R210
225 225A
4 7
4
CR2
OCV BOOST
CR3
7
RECTIFIER
R14
227 226
AC BOOST
CR3 CR3 CR3 8 8 5 5
227A
3 9 B A
258 CR2
CR3
220C
231B
CR2
FAN
3 9
257 CR3
B A
DC BOOST
FAN
260
233A
GAS VALVE
HI-FREQ
SV1
R13
235 INTENSITY
231D
231E
L11
L2
C6
S
1 256
115VAC
2 260
T2 SPARK
3
235
J12 GAP
5 255
6 236
233A
4
L3
F
237
C7
R5
ARC STARTER AS'BLY
236B
415 VOLT CONNECTION
CONNECT STRAP TO
HIGH (H4) (AS SHOWN)
380-400 VOLT CONNECTION
L1 (U)
CONNECT STRAP TO
MID (H3)
L2 (V)
220-230 VOLT CONNECTION
S1
CONNECT STRAP TO 06/17/2002
POWER SWITCH
LOW (H2)
220 VAC
RECEPT. H4 H3
L1 (U)
GND5 GND6
MID
L1A
BYPASS
HIGH
PC BOARD
L2A
CASE 115 VAC GAS
BACK RECEPT. VALVE
L2 (V)
COM
GROUND
RECONNECT PANEL
TO GROUND PER
NATIONAL
ELECTRICAL CODE
X1
X1
POS POS
L1
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
FRONT GANG
REAR GANG MICRO-SWITCH
D D2
B
S2A
NO
H
E
A NC
G
F
C
POS
B
X2
S2
POLARITY
(REAR VIEW, SHOWN
SWITCH
IN AC POSITION)
R7 BACKGROUND
271A
RECTIFIER
R8
269
271
262
270 263
201
204
220B W209
220A
R210
220C
214 212
S
213
C
TRANSFORMER
PRIMARY
BYPASS/ TRANSFORMER
THERMOSTAT
SECONDARY
STABILIZER
THERMOSTAT
PC BOARD
E
F
T3 R6
N.A. CONNECTION IS PIN TO PIN BETWEEN J23 AND J5.
284 285 N.B. ROBOTIC INTERFACE CONNECTION.
N.C. DISPLAY TOGGLE SHOWN IN MIN AMP POSITION.
N.D. PLUGS INTO LOWER SWITCHED RECEPTACLE.
FRONT
WORK
ELECTRODE
REAR
ELECTRODE
G-4
H1
220VAC
H2
51
A
CB2
C1
50
5A
52
250
LOW
C2
50A
C3
H1
X5 267
POWER FACTOR S
CAPACITORS 63.5VAC
H2 (220V) F
X6 268
H3 (380V)
H4 (415V) X3 231
S
231A
250 H5 (440V)
115VAC 231B
X9
S
201
X4 232
18VAC
204
105VAC
F
X10 F
X14 52
X1
S
X7
S 78VAC
W209
20VAC
X13
R210
F
X8
F
X2
T1
232
115VAC
C8
CB1
C9
15A
233
233B 231
4 8
0 1 50A
CR4
CR4
2
6
263 234
SV2
N.D. WATER VALVE
(OPTIONAL)
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
267 CB1 CIRCUIT BREAKER, 15 AMP
CB2 CIRCUIT BREAKER, 5 AMP
268
CR2,CR3 120V AC RELAY COIL
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
212
R8 RESISTOR, 5/50
R9 FREQ CONTROL POTENTIOMETER, 10K
S1A
R10 ON TIME CONTROL POTENTIOMETER, 10K
MICRO-
215 R11 BACKGROUND POTENTIOMETER, 10K
SWITCH
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
223
S2A MICROSWITCH ON POLARITY SWITCH
SCR1,2,3,4 MAIN POWER SCR'S
231B
SV1 GAS SOLENOID VALVE, 115VAC
233A SV2 WATER SOLENOID VALVE, 115VAC (OPTIONAL)
T1 MAIN TRANSFORMER
231A T2 HIGH VOLTAGE TRANSFORMER
T3 HIGH FREQ TRANSFORMER
COMPONENT VALUE
LEAD COLORING CODE:
UNITS:
B-BLACK U-BLUE RESISTORS:
G-GREEN W-WHITE OHMS/WATTS
O-ORANGE Y-YELLOW CAPACITORS:
R-RED MFD/VOLTS
CONNECTOR PIN NUMBERS:
EXAMPLE: THIS IS PIN 7
1 2 3 7
0F CONNECTOR J5
14
8 1 2 3 8
J5
LATCH
VIEW OF CONNECTOR ON PC BOARD
ELECTRICAL SYMBOLS PER E1537.
A
G4047-2
PRECISION TIG 375