PID for speed control
Below are given a couple of examples of programming
of VLT 5000 PID speed control.
175ZA451.10
A conveyor belt that carries heavy items must be main-
tained at a regular speed, which is set by means of a
potentiometer within the range of 0-1500 rpm, 0-10
Volts. The speed selected must be kept constant and
the integrated PID speed controller is to be applied.
This is a case of normal control, which means that
when the load increases, the power supplied to the
conveyor belt motor increases in order to keep the
speed constant. Correspondingly, when the load falls,
the power is reduced.
The feedback used is an encoder with a resolution of
1024 pulses/rev. push-pull.
1.
Start/Stop
2.
Speed reference 0-1500 rpm, 0-10 Volts
3.
Encoder 1024 pulses/rev. push-pull.
VLT
®
5000 Design Guide
MG.52.B2.02 - VLT
®
is a registered Danfoss trademark
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