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E-4

E-4

THEORY OF OPERATION

FIGURE E.4 – OPTIONAL POLARITY SWITCH AND POCKET AMPTROL CIRCUITS

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CONTROL

TRANSFORMER

FAN

MOTOR

 

 

OPTIONAL

 

 

 

 

 

 

OPTIONAL

 

 

POCKET

 

 

 

 

 

 

 

 

AMPTROL

 

 

 

 

 

 

 

POCKET

 

TRANSFORMER

 

 

 

 

 

 

AMPTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PC BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMPHENOL

OUTPUT

 

 

CONTROL

 

TERMINAL

 

DIAL

STRIP

ARC FORCE

 

CONTROL

SELECTOR

 

SWITCH

 

 

 

REMOTE

 

 

SWITCH

 

FEEDBACK

CONTROL BOARD

NEGATIVE OUTPUT TERMINAL

POWER

THERMOSTATS SWITCH

R

E

C

O

N

N

E

C

T

INPUT

CONTACTOR

MAIN

TRANSFORMER

G

S

A

I

T

G

E

N

 

A

 

L

 

S

 

SNUBBER

 

BOARD

SCR / DIODE

HYBRID BRIDGE

F

EOUTPUT

E

CHOKE

D

 

B

 

A

 

C

 

K

 

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.

IDEALARC R3R

Page 32
Image 32
Lincoln Electric R3R-300, R3R-500 service manual Optional Polarity Switch and Pocket Amptrol Circuits