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8. ARC FORCE -
This control functions in CC
Stick SMAW modes to adjust the Arc Force. The
arc is soft at the mini-mum settings and more
forceful or driving at the maximum settings. Higher
spatter levels may be present at the maxi-mum
settings. Full range is from -10(Soft) to +10(Crisp)
9. OUTPUT TERMINALS
nect terminals are compatible with TWECO®* con-
nectors. The terminal provide connection points for
the electrode and work cables. Refer to Output
Connection in the Installation chapter for proper
cable sizes. For positive polarity welding connect the
electrode cable to the positive terminal and the work
cable to the negative terminal. To weld nega-tive
polarity reverse the electrode and work cables.
TWECO® is registered trademark of Thermo Dyne Corporation.
10. THERMAL SHUTDOWN INDICATOR
This light will illuminate if an internal thermostat has
been activated. Machine output will return after the
internal components have returned to a normal
operating temperature. See Thermal Protection
later in this Operation chapter.
11. 6-PIN REMOTE RECEPTACLE
(Refer to Output Connection in the Installation chapter.)
CONSTANT CuRRENT PROCESSES
SHIELD METAL ARC WELDING*
The Invertec may be utilized as a manual DC ar c
welder with the electrode cable, work cable, and elec-
trode holder being the only equipment required.
AIR CARbON ARC CuTTING* (GOUGING)
Air carbon arc cutting may be performed with th e
Invertec within its output rating using 3/16"(4.8mm )
diameter carbon rods. Output cables, an air carbo n
arc electrode cable assembly, and a source of com-
pressed air are required.
TIG WELDING*
The ES 276i is capable of touch start TIG welding. An
electrode cable, work cable, TIG torch, and gas sup-
ply with regulator are required.
Touch starting is done as follows:
1.
Place the shield cup edge on the work piece.
2.
Rock the tungsten down to touch.
3.
Trigger the output, if using remote control
4.
Gently rock back the tungsten from the work-
piece.
OPERATION
- These quick discon-
-
ES 276i
Note: The short circuit current is limited to 20 amps to
aid in touch starting. Panel output control
becomes the current limit setting when in
remote control.
*Note: Operating this machine with the output control
set to maximum may cause the machine to
phase back and the arc to go out. This occurs
because the welding current exceeded 300
amps and the machine's protection circuitry
activated. Turn the output control down to cor-
rect this condition.
PARALLEL OPERATION
The Invertec's are operable in parallel. For best
results, the currents of each machine should be rea-
sonably well shared. As an example, with two
machines set up in parallel for a 300 amp procedure,
each machine should be set to deliver approximately
150 amps, not 200 amps from one and 100 amps
from the other. This will minimize nuisance feedback
conditions. In general, more than two machines in par-
allel will not be effective due to the voltage require-
ments of procedures in that power range.
To set machine outputs, start with output control pots
and arc force pots in identical positions. Adjust out-
puts and arc forces to maintain current sharing while
establishing the proper output current.
OVERLOAD PROTECTION
The machine is electrically protected from producing
high output currents. Should the output current exceed
300A, an electronic protection circuit will reduce the
current to less than 200A. The machine will continue to
produce this low current until the pro-tection circuit is
reset. Reset occurs when the output load is removed.
Note: When TIG welding with the Output Knob at or
above 275 Amps the Arc may go out.
THERMAL PROTECTION
Thermostats protect the machine from excessive
operating temperatures. Excessive temperatures may
be caused by a lack of cooling air or operating the
machine beyond the duty cycle and output rating. If
excessive operating temperature should occur, the
thermostats will prevent output voltage or current.
Thermostats are self-resetting once the machine cools
sufficiently.
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