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ELECTRICAL DIAGRAMS
R3R
Wiring Diagram-R3R-300
ELECTRICAL SYMBOLS PER E1537
LEGEND
D5
D6
D7
POCKET AMPTROL SENSING BRIDGE
L1 DC OUTPUT FILTER
R1
R2
R3
R4
15
14
13
4
5
6
7
8
9
TO SUPPLY LINES
TO GROUND
PER
NATIONAL
ELECTRICAL
CODE
1
2
3
L1
L2
L3
H3
H2
H1
X2
X1
T2
RECONNECT PANEL SHOWN
CONNECTED FOR LOW VOLTAGE
4
5
6
7
8
9
1
2
3
H3
H2
H1
X2
X1
T2
TO GROUND
PER
NATIONAL
ELECTRICAL
CODE
L1
L2
L3
TO SUPPLY LINES
TO GROUND
PER
NATIONAL
ELECTRICAL
CODE
H3
H2
H1
X2
X1
T2
TO SUPPLY LINES
TO GROUND
PER
NATIONAL
ELECTRICAL
CODE
231
H3
H2
H1
X2
X1
T2
TO SUPPLY LINES
ICR
TO PRIMARY
COILS
PRIMARY CONNECTIONS
4-7, 6-9, AND 5-8
MAIN TRANSFORMER .
1
2
3
L1
L2
L3
DIAL SELECTOR SWITCH
SCR1-D1
SCR2-D2
SCR3-D3
D4
SCR AND DIODE
RECTIFIER BRIDGE
T1
T2
T3
MAIN TRANSFORMER
CONTROL TRANSFORMER
POCKET AMPTROL OPTION
TRANSFORMER
( DASHED ITEMS ON WIRING
DIAGRAM ARE OPTIONAL )
CAVITY NUMBERING SEQUENCE
(COMPONENT SIDE OF BOARD)
CONNECTOR AND THESE THREE LEADS
ARE NOT USED WHEN OPTIONAL
POCKET AMPTROL IS PROVIDED
ABCDE
F
10K OHM POT., OUTPUT CONTROL
10K OHM POT., ARC FORCE CONTROL
40 OHM
SW1
SW2
SW3
SW4
POWER SWITCH
MACHINE/REMOTE SWITCH
L1
D4
D1
D2
D3
SCR1
SCR2
SCR3
R3
204
204
204
205
206
SHUNT
218
R4
D5
D6
D7
219
219
201
202
203
204
204
209
208
217
CONTROL
P.C.
BOARD
SW1
PILOT LIGHT
231
235
235
232
W
THESE LEADS ARE
PRESENT ONLY WITH
OPTIONAL METER
KIT.
204
224
220
225
115V
G
G
Y
T3
G
OPTIONAL POCKET
AMPTROL P.C.
BOARD
77
76
75
75
217
206
205
75
210
211
R1
SW2
R2
204
208
209
224
OPTIONAL METER KIT
VM
AM
+
+
--
FRAME GROUND
-
+
217
217
RECTIFIER BRIDGE
115 V
201
202
203
13 14 15
7
8
9
S
SS
10 11 12
123
456
66V
AUXILIARY COILS
BOTTOM PRIMARY
TOP PRIMARY
T1
X1
X2
X3
SEC SEC SEC
13, 14, & 15 ARE PRESENT
ON 380/500 OR 460/575
MACHINES ONLY.
THERE IS NO 10-11-12
CONNECTION ON 380
OR TRIPLE VOLTAGE
MACHINES.
A
CHOKE
THERMOSTAT
SECONDARY
THERMOSTAT
233
231
204
1
2
3
L1
L2
L3
11
10
12
3
2
1
9
8
7
6
5
4
RECONNECT PANEL SHOWN
CONNECTED FOR 380V .
TO PRIMARY COILS
H4
234
235
FAN MOTOR
221
222
223
G1
G2
G3
204
+
-
G1
G2
G3
204
226
220
204
211
210
213
77
212
76
(SWITCH SHOWN
IN LOCAL
POSITION)
A = AMBER
G = GREEN
W = WHITE
Y = YELLOW
COLORS
235
232
ARE MADE AT THE
SINGLE, 346V AND ABOVE
(EXCEPT 380V.)
380V OR TRIPLE
VOLTAGE
SINGLE, BELOW 346V OR
DUAL VOLTAGE
380/500 OR 460/575
V
66V
66V
76
77
SW4
OPTIONAL POLARITY SWITCH (60 Hz ONLY)
FLEX LEAD JUMPER
RECONNECT PANEL SHOWN
CONNECTED FOR LOW VOLTAGE
1
2
3
4
1
2
3
4
5
6
77
76
75
G
Y
218
219
J6
J7
1
2
3
4
5
6
7
8
75
213
212
201A
203A
J2
J4
201A
203A
J3
6
3
2
1
5
1
8
5
6
7
4
3
2
1
5
6
4
3
2
1
2
4
3
1
2
J1
SWITCH CRI
HOLD
INUP
PICK
NC
233A
232A
232
ICR
SWITCH CRI
HOLD
INUP
PICK
NC
233A
232A
232
TO PRIMARY
COILS
231
ICR
SWITCH CRI
HOLD
INUP
PICK
NC
233A
232A
232
231
ICR
SWITCH CRI
HOLD
INUP
PICK
NC
232A
232
233A
_
+
8434
3-8-91N
7-12-91A
3-6-92C
WIRING DIAGRAM
ALB
NONE
8434
2-6-91
L8069
t
UNLESS OTHERWISE SPECIFIED TOLERANCE
ON HOLE SIZES PER E2056
ON 2 PLACE DECIMALS IS .02
WITH PUBLISHED STANDARDS.
ON 3 PLACE DECIMALS IS .002
ON ALL ANGLES IS .5 OF A DEGREE
MATERIAL TOLERANCE (" ") TO AGREE
THE LINCOLN ELECTRIC CO.
CLEVELAND, OHIO U.S.A.
EQUIP.
TYPE
SCALE
SUBJECT
DR
DATE
CHK
REF.
SUPÕSÕDÕG
SHT.
NO.
THE LINCOLN ELECTRIC CO.
THIS SHEET CONTAINS PROPRIETARY INFORMATION
OWNED BY AND IS
NOT TO BE REPRODUCED, DISCLOSED OR USED
THE LINCOLN ELECTRIC CO.
L
L
WITHOUT THE EXPRESS PERMISSION OF
TO
PRIMARY
COILS
.4 OHM POCKET AMPTROL SENSING RESISTOR
J5
1
2
3
4
5
6
7
8
226
SNUBBER BOARD
4
2
1
3
4
1
2
REMOTE CONTROL RECEPTACLE
ICR INPUT STARTER
HIGH TEMP
LIGHT
D8
TP1
D8
TP1
TRANSIENT PROTECTOR
INPUT CONTACTOR BRIDGE
IDEALARC R3R 300, R3R 375-I
235
G-3
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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.