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E-4E-4
PRECISION TIG 275
THEORY OF OPERATION
FIGURE E.4 – HIGH VOLTAGE / HIGH FREQUENCY CIRCUIT
POWER
SWITCH
RECONNECT
PANEL
OPTIONAL POWER
FACTOR
POLARITY
SWITCH
BYPASS BOARD
W
ORK
F
RONT
ELECTRODE
REAR
ELECTRODE
78 VAC
X
1
X
2
A
C
A
C
DC
DC
S
HUNT
CHOKE
HIGH FREQUENCY
TRANSFORMER
HIGH VOLTAGE
TRANSFORMER
T
HERMOSTAT
1
15 VAC
115 VAC
115 VAC
F
AN
GATE LEADS
FEEDBACK
GAS
S
OLENOID
115 VAC
115 VAC
LED's
THERMOSTAT
2
0 VAC
2
0 VAC
CONTROL BOARD
BACKGROUND
CIRCUIT
FROM
CONTROL
BOARD
63.5 VAC
CORRECTION
CAPACITORS
R
EAR GANG
SCR
B
RIDGE
A
DVANCED CONTROL
P
ANEL RECEPTACLE
MINIMUM
OUTPUT
CONTROL
MAXIMUM
OUTPUT
CONTROL
PROTECTION
BOARD
REMOTE
R
ECEPTACLE
M
ETER
STICK
TIG
SWITCH
BALANCE
CONTROL
POST
FLOW
LOCAL/REMOTE
SWITCH
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.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
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