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22
Controller structure
The controller structure is defined through parameters Pb, dt and rt.
Example: PI
→
Pb
≠
0, dt=0, rt
≠
0
Parameter Value range
factory-set Notes
Pb 1
0—9999 digit
1
0
Proportional band 1 (controller output 1)
Proportional band 2 (controller output 2)
Influences the P action of the controller
If Pb = 0, the controller structure is ineffective.
Pb 2
0—9999 digit
1
0
dt 0—9999 sec
80 sec
Derivative time
Influences the D action of the controller.
If dt=0, the controller has no D action.
rt 0—9999 sec
350 sec
Reset time
Influences the I action of the controller.
If rt=0, the controller has no I action.
Cy 1
0.5—999.9 sec
20.0 sec
Duration of switching cycle 1 (controller output 1)
Duration of switching cycle 2 (controller output 2)
Duration of switching cycle on switching outputs.
The cycle time should be selected so that the energy
supply to the process is virtually continuous while the
switching elements are not subject to excessive wear.
Cy 2
0.5—999.9 sec
20.0 sec
1.
On the display with one or two decimal places the value range and the factory setting
change accordingly (e. g. 1 decimal place
→
value range: -199.9 to +999.9).