For presetting of reference variables
in analogue computing and regulating circuits, set-point
adjusters are used as control desk instruments in flush
mounting format or motor-driven potentiometers are used
for switch cabinet mounting.
For providing the set-point output, they contain mainly single or multiple ganging potentiometers with resistor output and
with current or voltage output respectively, associated with
a built-in signal converter. Inductive transducer systems with
current output or optoelectronic systems with digital output are available as well.
All types of transducer systems can be equipped with floating reversing switches for end-point limitation. The presetting of
the set-point is carried out mostly by hand with a rotary type
control knob on a dial of flush mounting instruments or carried
out with motor-driven potentiometers, additionally by means of set pulses with a d.c. motor or an a.c. motor (synchronous motor). Graduation of the scale, scale angle and colour of the scale are optional according to user requirements.
Motor-driven potentiometers are mostly used as set-point
adjusters in regulating circuits. Frequently they are used as
signal converter as well, for instance as
measured value memory or measured value delay unit
servo system in compensating circuits for analogue
Especially for servo systems, the motor-driven potentiometer
of series M7-G3O-PK613 serves in transformers or indicating instruments.
In connection with an appropriate servo-amplifier,
inexpensive high precision indirect-acting measuring
instruments can be realized easily for indicating purposes,
for instance in
braking force in motor
vehicle operational monitoring systems