THEORY OF OPERATION | |
FIGURE E.4 – HIGH VOLTAGE / HIGH FREQUENCY CIRCUIT |
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FROM
CONTROL
BOARD
OPTIONAL POWER
CORRECTIONFACTOR
CAPACITORS
POWER
BACKGROUND
CIRCUIT
63.5 VAC
REAR GANG | WORK |
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POLARITY
SWITCH
BYPASS BOARD
FRONT ELECTRODE
HIGH FREQUENCY
SWITCH
PANEL
RECONNECT
X1
VAC78 X2
AC | DC | CHOKE |
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| SCR |
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BRIDGE |
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AC | DC | SHUNT |
TRANSFORMER
HIGH VOLTAGE TRANSFORMER
REAR ELECTRODE
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115 VAC |
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THERMOSTAT | FAN | GATELEADS FEEDBACK | |||||||||
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| VAC |
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| 115 VAC |
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| 115 | |||||
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| 115 |
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115 VAC
Section Master
20 VAC
20 VAC
CONTROL BOARD
THERMOSTAT
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MINIMUM
OUTPUT
CONTROL
MAXIMUM
OUTPUT
CONTROL
ADVANCED CONTROL
PANEL RECEPTACLE
PROTECTION METER STICK
BOARDTIG SWITCH
REMOTE
RECEPTACLE
BALANCE POST
CONTROL FLOW
LOCAL/REMOTE
SWITCH
LED's
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HIGH VOLTAGE/HIGH FREQUENCY CIRCUIT
The control board passes the 115 VAC voltage to the primary of the high voltage transformer. The secondary of the high voltage transformer is coupled to a spark gap generator and also to the primary winding of the high frequency transformer. The secondary of the high frequency transformer is in series with the rear elec- trode output terminal. The high frequency “spark” is present at the electrode terminal and is transferred to the Tig torch.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
PRECISION TIG 275
