Arc Length Restriction (Usp); Vrd Open Circuit Voltage Reduction (Optional) - EWM PICO 230 Operating Instructions Manual

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
5.6.3

VRD open circuit voltage reduction (optional)

VRD
1
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
Category C environment
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.
Item No.: 099-002032-EWM01
Result
Select "Advanced settings":
The last parameter selected is displayed
3 sec
Select "Arc length restriction"
X x
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
T 1.22
AMP
VOLT
sec
AMP%
AMP
sec
Functional characteristics
S
R Rutil
RB Rutilbas
B Bas
RC Rutilcel
C Cel
Arcforce
PICO 230 CEL
Figure 5-6
Maximum permissible open circuit voltage
DC 35V peak value, or
AC 35V peak value and 25V r.m.s. value
Advanced settings (MMA welding)
Display
Parameter and value flash
alternately
Welding current or voltage
is displayed
Item Description
1 VRD open circuit voltage
reduction signal light
23