11. Hold the Arc Start switch down until an arc is
established. At this point, the Arc Start Switch
can be released, and the weld will continue.
Press and release the Arc Start switch a second
time to stop the arc. When the Afterflow timer
completes the cycle, the gas and water valves
close. To make another weld, repeat steps 10
and 11.
Note: Starting difficulties may often be due to not
pressing the Amptrol far enough. When the Amptrol is
just “cracked,” the minimum current (2 amps) is pro-
duced. Pressing the Amptrol more at the start of the
weld will often solve starting problems.
OVERLOAD PROTECTION
The Square Wave TIG 355 has thermostatic protection
from overloads, loss of cooling, and high ambient tem-
peratures. When the welder is subjected to an over-
load or loss of cooling, a thermostat will open.
If the
secondary
thermostat opens, the effect will be
the same as pushing the Stop power pushbutton: the
power will go off, the pilot light and meters will go out,
and the fans will stop. Pressing the Start power push-
button after the thermostat cools and resets will restart
the welder.
If the
primary
thermostat opens, the power will stay on
(pilot light and meters on and fans running), but no
more than 5 amps DC output current will be available.
This allows the fans to cool the machine. Depending
on the amount of welder overload, the thermostat
should reset within five minutes with the fan motors
running. When the primary thermostat cools and
resets, normal output current will be available.
AUXILIARY POWER
ALL MACHINES
The Square Wave TIG 355 provides 15 amps of 115
volt AC power at a standard NEMA 5-15R receptacle,
located on the lower case back of the machine. This
circuit is protected from shorts and overloading by a
15 amp circuit breaker, located next to the receptacle.
The auxiliary circuit is intended for running water cool-
ers and small power tools, whose current draw is with-
in the 15 amp rating.
Note that some types of equipment, especially pumps
and motors, have starting currents significantly higher
than their running currents. These higher starting cur-
rents may cause the circuit breaker to open. If this sit-
uation occurs, the user should avoid using the Square
Wave TIG 355 auxiliary for that equipment.
OPERATION
B-20
B-20
SQUARE WAVE TIG 355
CAUTION
FEB97
Summary of Contents for SQUARE WAVE IM467-B
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