Lincoln Electric PRECISION TIG SVM186-A Service Manual page 98

A A
B B
C
C
L5
D D
E
10K A-B E
AT MINIMUM
F
OPTIONAL
REMOTE REMOTE
TM RECEPTACLE
AMPTROL
FRONT
GANG
D
AC
A
E F
C
B
S2
POS
POLARITY
SWITCH
WORK
ELECTRODE
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.
VOLTAGE RECONNECTION
SEE RATING PLATE FOR SPECIFIC VOLTAGES
230 or 400-415 or 575 VOLT CONNECTION
(AS SHOWN & AS SHIPPED FROM FACTORY)
H1 and H3 (HIGH) TO POWER SWITCH.
H2 NOT CONNECTED; INSULATE.
208 or 380 or 460 VOLT CONNECTION
H1 and H2 (LOW) TO POWER SWITCH.
H3 NOT CONNECTED; INSULATE.
C1 AND C2 MUST ALWAYS BE CONNECTED
ACROSS TRANSFORMER PRIMARIES
C2
C1
W
H3
(L2)
H2
B
H1
(L1)
S1
G 313
POWER
SWITCH
314
S4
CHOKE
4 3 2 1 12 11 10 9 8 7 6 5 4 3 2 1
J4 J3
AUTO
MODE
BALANCE G SWITCH
LED
POLARITY SWITCH MICRO SWITCH
AC A-C, D-E, B-F OPEN
AC TIG LED
DC+ B-D, C-E, A-F, G-H CLOSED
BALANCE
DC- B-D, A-E, C-F, G-H CLOSED
CONTROL
REAR GANG MICRO-SWITCH
NO
H
NC
312A 312
G
311A 311
PULSE
S2A
DC
CONTROL
PULSE
FREQ G
LED
THERMAL
LED
POSTFLOW
(REAR VIEW,
A 1
CONTROL
SHOWN IN AC POSITION) C 2
B 3 OUTPUT
J5
4 CONTROL
D 5
285
6
E
CONTROL PC BOARD
115VAC
RECEPTACLE
C5
(BACK VIEW)
233
236
8 7 6 5 4 3 2 1
231B
R3
J2
236A
237
H3 (HIGH)
H2 (LOW)
C4
H1
201 X3
G R
TRIGGER 18VAC
STICK LED
204 X4
209 X5
POWER 18VAC
210
X6
X8
X1
115VAC
DIGITAL 78VAC
115VAC
DISPLAY
X2 X7
T2
T1
1 W 221
J1
2 R 222
L4
Y
J6
4
L1
L2
L3 C1,C2
C3
239 238
C4
SPARK
C5,C6
GAP
CB1
ARC
STARTER
AS'BLY C3
D1
284A 284B
L1
T3
L2,L3
R2 R1
L4,L5
R1,R2
285A 285B
R3
BYPASS/
R4,R5
STABILIZER
S1
PC BOARD
S2
S2A
285
S4
284
SCR1,2,3,4
SV1
T1
T2
T3
R
CLEVELAND , OHIO
C6
380V AND ABOVE
G
CONNECT GR EEN LEAD TO GROUND PER
231B
NATIONA L AND LOCAL ELECTRICAL CODE
B
231A CONNECT BLACK AND WHITE LEADS
(L1)
231
TO SUPPLY CIRCUIT
W
(L2)
232
CB1
208V/230V ONLY
TO GROUND PER
232A
NATIONAL ELECTRIC CODE
INPUT PLUG (208V/230V ONLY)
245 244
R4 R5
P7
4 3 2 1
J7
220 220A 218A
220A
SCR1
G1
217 AC
260
231A
SCR2
G2
218A
232 +
) (
FAN
115VAC
231
G3
SCR3
216
216A X2
G4
SCR4
SHUNT
_
) (
D1
W 221
POS
R 222
DC
235
BY-PASS CAPACITORS, .0047/250VAC
HIGH VOLTAGE CAPACITOR, .0025/10kV
PHASE SHIFT CAPACITOR, 15/250VAC
BY-PASS CAPACITORS, .22/400VDC
20A CIRCUIT BREAKER(208V/230V ONLY)
6A CIRCUIT BREAKER (380V AND ABOVE)
FREE WHEELING DIODE
OUTPUT INDUCTOR (CHOKE)
COMPONENT VALUE
HIGH FREQUENCY INDUCTORS
LEAD COLORING CODE:
UNITS:
RF TOROID CHOKES
RESISTORS:
HOLDING RESISTORS, 100/100W B-BLACK R-RED
OHMS/WATTS
G-GREEN W-WHITE CAPACITORS:
PHASE SHIFT RESISTOR, 200/100W
MFD/VOLTS
MICRO START RESISTORS, 12/100W
INPUT POWER SWITCH
CONNECTOR PIN NUMBERS:
POLARITY SWITCH
EXAMPLE: THIS IS PIN 7
MICROSWITCH ON POLARITY SWITCH
OF CONNECTOR J4
MAIN CHOKE THERMOSTAT 1 2 3 7
MAIN POWER SCR'S
GAS SOLENOID VALVE, 115VAC
8 14
MAIN TRANSFORMER
J4
LATCH
HIGH VOLTAGE TRANSFORMER
VIEW OF CONNECTOR ON PC BOARD
HIGH FREQUENCY TRANSFORMER
ELECTRICAL SYMBOLS PER E1537.
G5646
GAS VALVE
SV1
A