Pid For Process Control - Danfoss VLT 5000 Series Instruction Manual

PID for process control

The following is an example of a process controller
used in a ventilation system.
The following must be programmed in order shown - see explanation of settings in the Operating Instructions:
Function:
Activation of process controller
Feedback signal
Terminal 60, min. scale
Terminal 60, max. scale
Minimum feedback
Maximum feedback
Process units
Reference
Terminal 53, min. scale
Terminal 53, max. scale
Minimum reference
Maximum reference
Inverse control
Min. frequency
Max. frequency
Proportional gain
Integration time
174
In a ventilation system, the temperature is to be setta-
ble from - 5 - 35°C with a potentiometer of 0-10 Volt.
The set temperature must be kept constant, for which
purpose the integrated process controller is to be
used.
The control is of the inverse type, which means that
when the temperature increases, the ventilation speed
is increased as well, so as to generate more air. When
the temperature drops, the speed is reduced.
The transmitter used is a temperature sensor with a
working range of -10-40°C, 4-20 mA.
Min./Max. speed 10/50 Hz.
Parameter no. Setting
100 Process control, closed loop
314
Feedback signal
315 4 mA
316 20 mA (factory setting)
414 -10°C
415 40°C
416 °C
308 Reference (factory setting)
309 0 Volt (factory setting)
310 10 Volt (factory setting)
204 -5°C
205 35°C
437
Inverse
201 10 Hz
202 50 Hz
440 Application-dependent (e.g. 1.0)
441 Application-dependent (e.g. 5 sec.)
MG.51.C5.22 - VLT
®
VLT 5000 Series
NOTE
The example shows a two-wire transmit-
ter.
1. Start/Stop
2. Temperature reference -5-35°C, 0-10 V (set-
point)
3. Temperature transmitter -10-40°C, 4-20 mA
(feedback).
is a registered Danfoss trademark.
Data value no.
[3]
[2]
[10]
[1]
[1]