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.
The following must be programmed in order shown - see explanation of settings in the Operating Instructions:
Function:
Parameter no.
Setting
Data value no.
Activation of process controller
100
Speed control, closed loop
[1]
Feedback signal
314
Feedback signal
[2]
Terminal 32
306
Encoder feedback, input B
[24]
Terminal 33
307
Encoder feedback, input A
[25]
Minimum feedback
414
0 rpm
Maximum feedback
415
1650 rpm (max. ref. + 10%)
Reference
308
Reference
(factory setting)
[1]
Terminal 53, min. scale
309
0 Volt (factory setting)
Terminal 53, max. scale
310
10 Volt (factory setting)
Minimum reference
204
0 rpm
Maximum reference
205
1500 rpm
Min. speed
201
0 Hz
Max. speed
202
75 Hz
Proportional gain
417
Application-dependent
Integration time
418
Application-dependent
Differentiation time
419
Application-dependent
VLT
®
5000 Series
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
175
Examples of
us
e
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