Design and function
Voltage reducing device (VRD/SVRD)
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099-002032-EW501
29.04.2010
5.9
Voltage reducing device (VRD/SVRD)
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.
The voltage reducing device is a requirement in some countries and in many internal company safety
guidelines for power sources.
A distinction is made between two versions:
• VRD
(Voltage Reduction Device) or
• SVRD
(Slow Voltage Reduction Device)
Both switches meet the European standard (EN 60974-1:2005) and result in an increase in safety in
hazardous environments in particular (such as ship construction, pipe construction, mining).
VRD reduces the open circuit voltage to 12 V within 0.2 s and thus fulfils the Australian standard
(AS 1674.2-2003). SVRD reduces the open circuit voltage within 0.8 s to 12 V and thus fulfils the Russian
standard (
ГОСТ
12.2 007.8).
5.10
Remote control
NOTE
The remote control is operated on the 19-pole remote control connection socket.
5.10.1
Foot-operated remote control RTF 1
Features
• Infinitely adjustable welding current (0% to 100%) depending on the preselected
main current on the welding machine.
5.10.2
Manual remote control RT 1
Functions
• Infinitely adjustable welding current (0% to 100%) depending on the preselected
main current on the welding machine.
5.10.3
Manual remote control RT PWS 1
Functions
• Infinitely adjustable welding current (0% to 100%) depending on the preselected
main current at the welding machine
• Pole reversing switch, suitable for machines with PWS function
