Pid Process Control; Hardware Set-Up - Siemens Midimaster Eco Reference Manual

PID PROCESS CONTROL

Together with open loop motor control, PID closed loop process control can be applied to any process
which is a function of motor speed and for which a transducer is available to provide a suitable
feedback signal ( see Figure below ). When closed loop process control is enabled (P201 = 001), all
setpoints are calibrated between zero and 100%, i.e. a setpoint of 50.0 = 50%.
Note: All inputs become percentages
P001=1
Setpoint Display %
Integral
Capture
+
Range
-
P001=7
Feedback Display %
P201
PID
on/off
Closed Loop Process Control

HARDWARE SET-UP

Make sure that the DIP selector switches 4 and 5
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are correctly set (
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) and in agreement with P323 for
unipolar voltage or current feedback signal inputs.
Connect feedback transducer between control
terminals 10 and 11 (analogue input 2). This
analogue input accepts a 0/2 - 10 V or a 0/4 - 20
mA input signal (determined by the setting of the
DIP selector switches 4 and 5 and P323) has 10-
bit resolution and permits a differential (floating)
13-34
Dip
Signal
Analog
Switches
Type
Input 1
V or I
V or I
P005
Up/Down Digital
%
Keys on Frequency
Keypad Setpoint
P041 to P044
P046 to P049
P202
Proportional
P207
P205
P203
Intergral
Intergral
Scaling
P204
Derivative
P208
Transduce
r Type
P021
P023
P022
%
%
Scaling
P011
%
%
Setpoint
Memory
P051 to P055, P356
%
Fixed Digital
% via terminal
rail
P910
Setpoint
from USS
P002
P012
P003
P013
Hz
+
Accel / Frequency
=
+
decel Limits
+
P210
Feedback
Monitoring
P211
P206
P212
Scaling Filtering
input. Make sure that the values of parameters
P006, P024 are set to 000.
15 V dc power for the feedback transducer can
be supplied from terminal 9 on the control
terminal block.
ECO REFERENCE MANUAL
P006 / P910
P006=1
P006=0
P006=2
Reference
Setpoint
Source
P910
P001=0
Output Frequency Display
Process
Motor
(eg. fan)
Transducer
(eg. duct
pressure
sensor)
Dip
Switches
V or I
P323
Signal
Type
V or I