Functional characteristics
Advanced settings (MMA welding)
Item No.: 099-002032-EWM01
23
5.6.2
Arc length restriction (USP)
In spot or tack welding it can be useful to restrict the length of the arc to prevent the undesirable
“lengthening” of the arc.
The arc length restriction is switch on and off separately for each electrode characteristic.
Control element Action
Result
Display
3 sec
Select “Advanced settings”:
The last parameter selected is displayed
Parameter and value flash
alternately
X x
Select “Arc length restriction”
Switch the function on or off
Switch on USP = on
Switch off USP = off
3 secs.
Deselect “Advanced settings”:
Press for 3 seconds and hold until the
welding current or welding voltage is
shown on the display
Welding current or voltage
is displayed
5.6.3
VRD open circuit voltage reduction (optional)
Item
Description
1
VRD open circuit voltage
reduction signal light
AMP
AMP%
sec
T 1.22
AMP
VOLT
RB
Rutilbas
Rutil
R
RC
Rutilcel
Bas
B
sec
Arcforce
PICO 230 CEL
S
Cel
C
1
VRD
Figure 5-6
Welding machines with the “VRD” option is equipped with a voltage reduction device which meets the
requirements set down in the Australian standard AS 1674.2-2003 in a category C environment, in
accordance with table 3.2.6:
Operating conditions
Maximum permissible open circuit voltage
Category C environment
DC 35V peak value, or
AC 35V peak value and 25V r.m.s. value
The signal light (VRD open circuit voltage reduction) indicates when the voltage reduction device has
been activated. This then ensures that the open circuit voltage between the electrode holder and the
workpiece is reduced to the permissible values.
