20
Voltage Reduction Device (VRD versions only)
General
A Voltage Reduction Device (VRD) is an optional safety device for reducing the voltage.
As far as possible, VRD prevents output voltages at the current sockets that may pose a
danger to persons.
Safety principle
VRD is active
Welding circuit resistance is greater than
the minimum human body resistance (gre-
ater than or equal to 200 Ohm):
-
VRD is active
-
Open circuit voltage is limited to 12 V
(otherwise 90 V)
-
There is no risk in unintentionally
touching both welding sockets at the
same time
VRD is not active
Welding circuit resistance is less than the
minimum human body resistance (less than
200 Ohm):
-
VRD is inactive
-
Output voltage not restricted in order to
ensure sufficient welding power
-
Example: Start of welding
IMPORTANT!
Within 0.3 seconds of the end of welding:
-
VRD is active again
-
The output voltage is limited to 12 V again
