E32.0.A3.6C-01 Manual for connection and operation of the JDS-211 page 14 of 16
Addendum A: PID-control definition
Set point value:
The temperature on which the controlling shall be done.
Manipulating variable:
The power the controller passes on the process.
0 = 0% power; 1 = 100% power.
This is done at
PID-controller
by clocking
switching function 1 or the continuous output.
Motorised valve control:
by switching “switching output 1“ and “switching output 2“.
output 1 = open actuator
output 2 = close actuator
„1.Pb“ (Proportional band):
Bandwidth around the set point value, where the proportional control responds linear.
A small proportional proportion has the effect that a little divergence from the set point value leads to a
big change of the heating power.
A big Proportional proportion has the effect, that the controller intervene weakly. The control gets inert.
„1.Int“ (Integral time, I-action):
Integral time [in sec.] of the PID control algorithms.
The higher the set value, the weaker the effect. The control tends to swinging if integral time is too low.
„1.dEr“ (Derivative time, D-action):
Derivative time [in sec.] of the PID control algorithms. The smaller the set value, the effect.
The derivative time reacts on the change of the manipulating variable.
„1.CyC“ (Cyclic time):
Cyclic time of the control [in sec.]. The control state is detected in the set cycle and the manipulating vari-
able is output accordingly.
At PID-control is this the cyclic time of output 1, too.
„1.dur“ (Propagation time of propulsion):
Time [in sec.] the propulsion needs to get the actuator from “entire close“ to “entire open“.
„1.thr“ (Minimum change of manipulating variable):
The minimum value of the manipulating variable in %, that must be reached, before there is an effect on
the output. By this parameter you can avoid that the actuator actuated too frequently or for a too short pe-
riod of time.
