A.C. Voltage Stabilisers
All the Rilton A.C.Stabilisers have the same electronic control
system used in conjunction with a motorised Variable Transformer of various ratings
(Single or three phase) up to a maximum of 156 Amps Line current.
The control system obtains it's supply from the variable transformer and in turn generates
an adjustable stabilised 0-12V reference. The feedback from the brush or the load produces
a 0-12V signal which is compared to the set reference voltage. Any difference between the
fed back voltage and the reference voltage is used to drive the motorised variable
transformer to a position that corrects the difference between the two voltages.
The "set output" potentiometer can be adjusted to any
position between zero and line voltage and the Variable Transformer is driven to the
position on the track dictated by that potentiometer and will provide a stabilised output
at any specified voltage.
The output voltage is normally stable to +/- 0.5V but the
accuracy can be reduced to +/- 2.5V by the sensitivity potentiometer. This is sometimes
required to prevent "hunting" about the set point.
The design of the control system will also allow the "set output" to be
controlled by a 12V signal from a microprocessor allowing integration in an automatic
process system.
The figure below shows the schematic drawing of the stabiliser
system.
