Lincoln Electric R3R-300, R3R-500 OPTIONAL POLARITY SWITCH AND POCKET AMPTROL CIRCUITS

THEORY OF OPERATION
E-4 E-4
IDEALARC R3R
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FIGURE E.4 – OPTIONAL POLARITY SWITCH AND POCKET AMPTROL CIRCUITS
CONTROL BOARD
OUTPUT
CONTROL
ARC FORCE
CONTROL
CONTROL
TRANSFORMER
POWER
SWITCH
R
E
C
O
N
N
E
C
T
INPUT
CONTACTOR TRANSFORMER
MAIN SCR DIODE
HYBRIDBRIDGE
/SHUNT
OUTPUT
CHOKE
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
G
A
T
E
S
I
G
N
A
L
S
FEEDBACK
F
E
E
D
B
A
C
K
THERMOSTATS
FAN
MOTOR
TERMINAL
STRIP
REMOTE
SWITCH
DIAL
SELECTOR
SWITCH
SNUBBER
BOARD
AMPHENOL
POLARITY
SWITCH
OPTIONAL
OPTIONAL
POCKET
AMPTROL
PC BOARD
OPTIONAL
POCKET
AMPTROL
TRANSFORMER
OPTIONAL POLARITY SWITCH
AND POCKET AMPTROL CIRCUITS
The polarity switch permits changing the arc polarity at
the output terminals of the R3R machine. This switch
should not be changed while welding.
The Pocket Amptrol option provides the operator with
“wireless” remote current control capabilities. The cir-
cuit is powered by the optional amptrol transformer,
which has a 115VAC primary winding and a 24VAC
tapped secondary winding. The control board
receives command information from the voltage sens-
ing network located on the positive output lead. This
information is processed on the Pocket Amptrol PC
board, and the current control signal is sent to the
board.