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THEORY OF OPERATION
B-4 B-4
INVERTEC® V155-S
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5. Positive Quick Disconnect: Positive output con-
nector for the welding circuit.
6. Negative Quick Disconnect: Negative output con-
nector for the welding circuit.
REAR CONTROL PANEL
(See Figure B.2)
7. Power Switch: It turns ON / OFF the input power
to the machine.
8. Input cable: This machine is provided with a
plugged input cord. Connect it to the mains.
9. Fan: This machine has a F.A.N. (Fan As Needed)
circuitry inside: the fan is automatically turned ON
or OFF. This feature reduces the amount of dirt
which can be drawn inside the machine and reduces
power consumption. The F.A.N. operates differently
in different weld mode.
• Stick mode: When the machine is turned ON the
fan will turn ON for a short time and then go off if a
weld is not started. The fan will continue to run when-
ever the machine is welding. The fan will turn OFF
five minutes after the welding is stopped.
• TIG modes: When the machine is turned ON the
fan is OFF. The fan will turn ON only when a weld
is started and it will continue to run whenever the
machine is welding. The fan will turn OFF five min-
utes after the welding is stopped.
FIGURE B.2
7
8
9
AUTO ADAPTIVE ARC FORCE
(WITH STICK WELDING)
The Auto Adaptive Arc Force function is activated dur-
ing stick welding. This function temporarily increases
the output current, to clear intermittent shorts between
the electrode and the weld puddle that may occur dur-
ing 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 out-
put voltage and is controlled by the microprocessor on
the Control Board.
The circuit determines the amount of current neces-
sary to release the metal droplet that is being trans-
ferred from the electrode to the workpiece to guarantee
the arc stability without going too high, to minimize the
spatter levels. That means:
• Electrode to workpiece sticking prevention, even at
low current values.
• Spatter reduction.
The welding operations are simplified and the welded
joints look better, even if not brushed after the welding.
This feature is available in both the Soft Stick and Crisp
Stick operating modes. The Crisp Stick feature also
increases the Hot Start action, facilitating the arc strik-
ing.
The following features are also enabled in the stick
welding modes:
• 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.