WFU12-4C
18
When welding in MIG mode there is always a voltage drop associated with the losses in the welding cables and
the operator must always set the power source output higher than the required arc voltage to overcome loss.
The WFU12-C wire feeders has an optional automatic voltage control system that automatically adjusts the
power source output to compensate for voltage drop caused by the welding cable losses.
The operator may set the voltage and wire feed speed on the front panel of the wire feeder before welding
with the knowledge that any losses in the interconnection cables and earth lead will be automatically
compensated for. It is possible to increase or decrease the welding interconnection length without any
change to the wire feeder settings and still maintain the set arc voltage.
The automatic voltage control system is ideal for welding applications where the point of welding is some
way from where the power source is sited.
For the automatic voltage control to work correctly the voltage reference lead must be connected directly to
the welding work and must remain connected in order to ensure an accurate reading of arc voltage.
3. Operation
WFU12-4C
13
SECTION 4 — OPERATION
4.5 - Voltage Reference
When welding in MIG mode there is always a voltage drop associated with the losses in
the welding cables and the operator must always set the power source output higher
than the required arc voltage to overcome loss.
The WFU12-C wire feeders has an optional automatic voltage control system that auto-
matically adjusts the power source output to compensate for voltage drop caused by
the welding cable losses.
The operator may set the voltage and wire feed speed on the front panel of the wire
feeder before welding with the knowledge that any losses in the interconnection cables
and earth lead will be automatically compensated for. It is possible to increase or de-
crease the welding interconnection length without any change to the wire feeder set-
tings and still maintain the set arc voltage.
The automatic voltage control system is ideal for welding applications where the point of
welding is some way from where the power source is sited.
For the automatic voltage control to work correctly the voltage reference lead must be
connected directly to the welding work and must remain connected in order to ensure
an accurate reading of arc voltage.