1.
POWER ON/OFF
— A momentary start/stop
pushbutton, which controls the input contactor. If
the input power supply goes off or if the thermo-
stat in the welder trips, the start pushbutton must
be pressed to restart the welder.
2.
PILOT LIGHT
— Indicates when the input contac-
tor is energized (power is on).
Do not switch polarity under load.
3.
POLARITY SWITCH
— Selects DC-/AC/DC+
4.
FUSE F1
— 0.5 amp control circuit fuse protects
the control transformer from overloads. Input
overvoltage protection circuitry will blow this fuse
to protect electronic components if the input volt-
age to the welder is too high (more than 40% over
rated voltage). If this fuse blows, the digital meters
will not light and the input contactor will not latch
when the Power On/Off Start pushbutton is
pressed and released.
5.
FUSE F2
— 1.5 amp gas, water, and high fre-
quency fuse protects the circuitry that drives the
gas and water valves and the high frequency sup-
ply transformer. If this fuse blows, the valves and
high frequency will not work. However, the LEDs
for Gas and Water and High Frequency will still
light.
6.
REMOTE RECEPTACLE
— A six-pin circular con-
nector for an Arc Start switch or an Amptrol
remote current control.
7.
115 VOLT RECEPTACLE AND CIRCUIT BREAK-
ER
— A duplex 15 amp grounded NEMA 5-15R
receptacle and 15 amp circuit breaker. Fifteen
amps of 115 volt AC power is available continu-
ously whenever the power is on. The circuit
breaker button will pop out if it trips. Reset by
pushing it in after the circuit breaker cools and the
overload has been removed.
8.
HIGH FREQUENCY INTENSITY CONTROL AND
SPARK GAP
— This control changes the high fre-
quency intensity. Use the lowest intensity which
still gives good arc starting to minimize Radio
Frequency Interference (RFI). The spark gap is set
at the factory to the normal setting marked on the
cover plate. Instructions for larger or smaller gap
settings are also on the cover plate.
9.
GAS AND OPTIONAL WATER VALVES
—
Solenoid valves that open at the beginning of the
Preflow time and close at the end of the Afterflow
time.
The gas valve inlet and outlet are standard 5/18-18
right-hand female fittings. The water valve inlet
and outlet are standard 5/8-18 left-hand female fit-
tings. The fittings conform to CGA (Compressed
Gas Association) standards. Use a water line
strainer to prevent particles from jamming the
water valve.
OPERATION
B-11
B-11
SQUARE WAVE TIG 355
CAUTION
Summary of Contents for SQUARE WAVE IM467-B
Page 49: ...Notes ...
