Lincoln Electric SAF-FRO PRESTO 270 Manual De Instrucciones página 9

Remote Control Connection
Refer to the accessories section for a list of
remote controls. If a remote control is used,
it will be connected to the remote connector
on the front of the machine. The machine
will automatically detect the remote control,
turn on the REMOTE LED, and switch to remote control
mode. More information on this mode of operation will
be given in the next section.
Features Enabled With MMA Welding
Hot Start
This is a temporary increase in the initial welding current.
This helps ignite the arc quickly and reliably.
Anti-Sticking
This is a function that decreases the output current of
the machine to a low level when the operator makes an
error and sticks the electrode to the work piece. This
decrease in current allows the operator to remove the
electrode from the electrode holder without creating
large sparks that can damage the electrode holder.
Arc Force
This is a temporary increase in the output current during
normal stick welding. This temporary increase in output
current is used to clear intermittent connections between
the electrode and the weld puddle that occur during
normal stick welding.
Auto Adaptive Arc Force (only with Soft or Crisp
MMA welding)
During MMA welding is activated the function Auto
Adaptive Arc Force that increases temporary the output
current, used to clear intermittent connections between
the electrode and the weld puddle that occur during stick
welding.
This is an active control feature that guarantees the best
arrangement between the arc stability and spatter
presence. The feature "Auto Adaptive Arc Force" has
instead of a fixed or manual regulation, an automatic and
multilevel setting: its intensity depends by the output
voltage and it is calculated in real time by the
microprocessor where are also mapped the Arc Force
levels. The control measure in each instant the output
voltage and it determines the amount of the peak of
current to apply; that value is enough to breaks the metal
drop that is being transferred from the electrode to the
workpiece as to guarantee the arc stability, but not too
high to avoid spatters around the welding puddle. That
means:

Electrode / workpiece sticking prevention, also with
low current values.

Spatters reduction.
The welding operations are simplified and the welded
joins looks better, also if not brushed after the welding.
Refer to the section below for more details.
English
Controls and Operational Features
Machine Start-Up:
When the machine is turned ON, an auto-test is
executed; during this test all LEDs and display's shown
"888"; after few seconds the LEDs and display turn OFF.
Only the Power ON/OFF LED lights up.

The Machine is ready to operate when on the Front
Control Panel lights up the Power ON LED with one
of the four LED of the Welding mode command.
Front Panel Controls
Output Current Knob: Potentiometer used to set the
output current used during welding.
Power ON/OFF LED: This LED lights up when the
machine is ON.
If blinking, this LED indicates that an Input Voltage
Overrange protection is active; the Machine restarts
automatically when the Input Voltage returns in the
correct range. If the Machine does not restart
automatically, an
condition may be present: the machine needs to be
turned OFF then ON again to restart.
Note: The Fan could be automatically switched OFF if
the error condition persist for more than 2seconds.
Remote LED: This indicator will turn on when a remote
control is connected to the machine via the remote
control connector. Using a remote control will replace the
function of the output current control, that will be
automatically disabled.
Thermal LED: This indicator will turn on when the
machine is overheated and the output has been
disabled. This normally occurs when the duty cycle of
the machine has been exceeded. Leave the machine on
to allow the internal components to cool. When the
indicator turns off, normal operation is again possible.
6
Internal auxiliary undervoltage
English