Lincoln Electric PRECISION TIG 375 Service Manual page 115

G-3
WIRING DIAGRAM - ENTIRE MACHINE - CODE 10810 (G4047-1)
CONTROL PANEL (VIEWED FROM REAR)
306 1 1 301
303 2 2
3 3 304B
METER
4 4
302
5 5
6
6
(VIEWED FROM REAR)
MINIMUM
OUTPUT DISPLAY
R4
313B
MAXIMUM
STICK LOCAL
BALANCE
OUTPUT
R2 R1
TIG
REMOTE
MODE
(STICK) (AUTO BAL) (REMOTE)
(P. FLOW)
+ - + - + - +
R G G G
B W B W B W B
ADVANCED CONTROL PANEL
BACKGROUND
FREQ ON TIME
R11
R9 R10
401C
4-STEP ON (PULSE ON)
- +
G
W
OFF
2-STEP
TRIGGER PULSE
A A
B B
C C
L8
D D
E E
10K A-B
AT MINIMUM F
F
OPTIONAL
REMOTE
REMOTE
RECEPTACLE
TM
AMPTROL
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.
CONTROL PC BOARD
L5
N.C.
301 1
2
302
303 3
J8
304 4
304A 5
306 6
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
1
W
331
6
B
(THERMAL)
2
W
- 332
Y 7
B
3
W W
B W 333 J10
8
B
4
W
334
9
B
5
W
335
B 10
L7
1
3
2
J7
5
4
6
DOWN SLOPE
R12
J3
1 *** 3 4 5 6 7 8 9 10
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 2
A 4
3 3
B 1
J23 4 4
C 2
J22
5 5
D 3 J5
N.A.
7
E 6 7
6
F 5
6
8
8
ELECTRICAL DIAGRAMS
PRECISION TIG 375 WIRING DIAGRAM
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
252 B
1
G3
253
9
SCR3
2
269
10 270
220
3
271
11 220B
6 265
SCR4 D1
J11
266
12
G4
5 262
13 263
4 213
14 214
7
201
L13
15 204
8 W209
R210
16
225
225A
4 7
4
CR2
OCV BOOST
CR3
7 RECTIFIER
R14
227 226
AC BOOST
5 5
CR3 CR3 CR3 8 8
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 T3
2 260
T2 SPARK
3 235
J12
GAP
5 255
6 236
4 233A
L3
F
237
R5 C7
ARC STARTER AS'BLY
236B
ELECTRODE
L1 (U)
L2 (V)
POWER SWITCH
H4 H3
L1 (U)
MID
C5
HIGH
C4
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
S2A
NO
H
E A NC
F G
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
214 212 212
S
215
213
C
TRANSFORMER
PRIMARY
BYPASS/ TRANSFORMER
THERMOSTAT
SECONDARY
STABILIZER
THERMOSTAT
PC BOARD
223
231B
233A
231A
E F
R6
N.A. CONNECTION IS PIN TO PIN BETWEEN J23 AND J5.
N.B. ROBOTIC INTERFACE CONNECTION.
284 285
N.C. DISPLAY TOGGLE SHOWN IN MIN AMP POSITION.
N.D. PLUGS INTO LOWER SWITCHED RECEPTACLE.
FRONT
WORK
ELECTRODE
REAR
G-3
H1
575 VOLT CONNECTION
CONNECT STRAP TO
HIGH (H4) (AS SHOWN)
S1
460 VOLT CONNECTION
A
CONNECT STRAP TO
MID (H3)
H2
230 VOLT CONNECTION
250
C1
CONNECT STRAP TO
LOW (H2)
LOW
C2
C3
H1
POWER FACTOR
CAPACITORS X5 267
S
63.5VAC
H2 (230V)
F
H3 (460V) X6 268
H4 (575V) X3 231
S
231A
X9
115VAC
S 231B
201
F
232
18VAC X4
204
F
X10
X1
S
X7
S
W209 78VAC
20VAC
X13
R210
F
X8 F
X2
T1
232
115VAC
C8
CB1 C9
15A
233
233B 231
4 8
N.D.
0 1
CR4
CR4
2 6
263
234
SV2
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
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
R8 RESISTOR, 5/50
R9 FREQ CONTROL POTENTIOMETER, 10K
S1A R10 ON TIME CONTROL POTENTIOMETER, 10K
MICRO- 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
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
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
8 14 1 2 3 8
J5
LATCH
VIEW OF CONNECTOR ON PC BOARD
ELECTRICAL SYMBOLS PER E1537.
3-8-2002A
G4047-1
PRECISION TIG 375