Lincoln Electric LF 52D Operator's Manual page 22

In synergic mode, the welding voltage is not set directly
by user.The correct welding voltage will be set by the
machine's software.
Optimal voltage value is related to the input data:

Wire Feed Speed, WFS.
If it is needed, the welding voltage can be adjusted by
the right control [23]. When the right control is rotated,
the display will show a positive or negative bar indication
if the voltage is above or below the optimal voltage.

Voltage setup above
optimal value

Voltage setup at
optimal value

Voltage setup below
optimal value
Additionally can manually set:

Burnback

Run-In WFS

Preflow Time/ Postflow Time

Spot Time

2-Step/4-Step

Crater

Polarity

Wave Control:

Pinch
Pinch controls the arc characteristics during short-arc
welding. Increasing Pinch Control results in a crisper arc
(more spatter) while decreasing provides a softer arc
(less spatter).

Adjust range: from -10 to +10.

Default value: 0.
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