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E-3

THEORY OF OPERATION

 

HIGH VOLTAGE / HIGH FREQUENCY CIRCUIT

 

 

 

 

POLARITY

 

 

BY-PASS

 

 

 

 

 

 

BOARD

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

WORK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HI-FREQ

 

 

 

 

 

 

 

 

TRANSFORMER

LINE

 

 

 

 

 

 

 

ELECTRODE

MAIN

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

R

X2

 

AC

DC+

 

 

 

E

 

SHUNT

 

 

 

 

SCR

 

 

C

 

 

 

 

 

 

 

 

 

BRIDGE

 

 

 

O

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

E

X1

 

AC

DC-

 

 

 

C

 

 

CHOKE

 

 

T

 

 

 

 

 

 

 

 

SIGNALSGATE

 

 

 

 

 

 

POWER

 

 

 

 

 

 

FEEDBACK

 

 

 

 

 

 

 

 

FACTOR

 

 

 

 

 

 

 

 

CAPACITORS

 

 

 

 

 

 

 

 

 

 

 

ARC START

 

 

LCD DISPLAY

 

 

 

 

 

 

 

 

 

115VAC

PROTECTION

115 VAC

CONTROL

KEYPAD

FAN

 

 

 

SNUBBER

 

GATE SIGNALS

BOARD

 

LED

 

 

BOARD

 

 

BOARD

 

 

 

 

 

 

 

 

 

 

 

 

HI-FREQ

 

 

KEYPAD

 

 

 

 

 

115 VAC

 

 

 

 

115

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VAC

 

 

24 VAC

 

 

 

 

 

 

CONTROL

18 VAC

 

 

 

115 VAC

 

 

TRANSFORMER

 

 

 

 

 

16 VAC

 

 

 

 

 

 

 

 

 

RECEPTACLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

115 VAC

 

HIGH VOLTAGE

HIGH FREQUENCY SPARK

 

 

 

TRANSFORMER

 

REMOTE

 

 

 

 

 

 

 

 

 

CIRCUIT

 

 

 

RECEPTACLE

 

 

 

 

 

 

 

 

 

 

 

 

The control board passes the 115vac through the pro- tection / snubber board to the primary of the high volt- age transformer. The secondary of the high voltage transformer is coupled to a spark gap generator and also to the high frequency transformer. The high fre- quency transformer transfers the high frequency “spark” to the electrode stud.

SQUARE WAVE TIG 255

Page 36
Image 36
Lincoln Electric SVM100-A service manual High Voltage / High Frequency Circuit