INTRODUCTION
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| V.R.D FRONT IMAGE |
VRD stands for (voltage reduction device) OR WESH GUARD. When a VRD is fitted to a welding machine
it reduces the maximum unloaded open circuit voltage
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| V.R.D BACK IMAGE |
across the output
terminals of the welder to
a safe
voltage normally this reduced voltage When Off OCV
sensing voltage Is About 12v to 20v When a load of
less than 200
ohms resistance is applied to the output of the welding
machine the VRD will
sense this and turn the
welder to full output then welding will commence.
When the resistance across the output rises above 200
ohms or the
electrode is removed from the work piece then the VRD will turn the
output of the welder back to a reduced output state.
VRD FOR GENERETOR WELDING SET
In the motor generator welding set the motors runs in
the delta connection when welding is going on. The machine remains in same mode
of connection even thought welding activity is stopped. Thus, a great amount of
energy is wasted .
Auto welds senses the stoppage of welding and converts
the machine to star connection within a predetermined time. This directly gives
about one third energy saving. If the motors runs star connection for a
predetermine time it cuts off the machine and saves even more power.
When the electrodes comes in contact with the job when
the motor is in star, It instantly converts the connection from star to delta
and the welding process can be
continued. (With same quality)
The amount of energy save depends upon the KW rating and
quality of machine .
VRD FOR WELDING RECTIFIER TRANSFORMER
In a welding transformer or rectifier , the primary
winding of the transformer is always energized .even if welding is not going on
the machine always draws some current from the supply to meet the no load
losses. this energy is not utilized for any productive purpose . hence, it is a
waste
Auto weld senses the stoppage in welding and cuts off
the supply to the primary winding
Within a predetermined time. “auto weld” re energizes
the
primary winding instantly without affecting the welding quality as soon as the electrode comes in
contact with the job
Auto weld
can be used effectively in conjunction
with transformer /rectifier of any capacity & make .the amount of energy
saved depend upon the KVA rating &
the quality
TECHNICAL SPECIFICATION OF VRD
FEATURE OF VRD
1.Reducing machine heat
2.Improve power factor
3.Easy to mounting
4.Easy to use
5.Energy saving
6.Shock preventive Device by Reducing output voltage
7.Instant start of welding operation
8.compact
assembly
