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THEORY OF OPERATION
FIGURE E.4 – OPTIONAL POLARITY SWITCH AND POCKET AMPTROL CIRCUITS
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CONTROL
TRANSFORMER
FAN
MOTOR
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AMPHENOL | OUTPUT |
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| CONTROL |
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TERMINAL |
| DIAL |
STRIP | ARC FORCE | |
| CONTROL | SELECTOR |
| SWITCH | |
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FEEDBACK
CONTROL BOARD
NEGATIVE OUTPUT TERMINAL
POWER
THERMOSTATS 
SWITCH
R
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C
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INPUT
CONTACTOR
MAIN |
TRANSFORMER |
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A | I |
T | G |
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| SNUBBER |
| BOARD |
SCR / DIODE
HYBRID BRIDGE
F
EOUTPUT
E | CHOKE |
D |
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B |
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K |
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SHUNT
OPTIONAL
POLARITY
SWITCH
POSITIVE OUTPUT TERMINAL
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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.