Siemens SIPART DR21 User Manual

6 Commissioning
6.6 Manual setting of the control parameters
Manual
SIPART DR21
C73000-B7476-C143-08
189
6.6 Manual setting of the control parameters
without knowledge of the plant behavior
The control parameters for optimum control of the system are not yet known in this case. To
keep the control circuit stable in all cases, the following factory settings must be made:
Proportional action factor Kp = 0.1
Integral action time Tn = 9984 s
Derivative action time Tv = oFF
D P-controller (control signal P = high)
- Set the desired setpoint and set the control difference to zero in manual operation.
- The operating point necessary for the control difference is set automatically in manual
operation at Yo=AUto (factory setting). The operating point can also be set manually by
setting the online-parameter y
o
to the desired operating point.
- Switch to automatic operation.
- Increase Kp slowly until the control loop tends to oscillate due to slight setpoint changes.
- Reduce Kp slightly until the oscillations disappear.
D PD-controller (control signal P = high)
- Set the desired setpoint and set the control difference to zero in manual operation.
- The operating point necessary for the control difference is set automatically in manual
operation at Yo = AUto (factory setting). The operating point can also be set manually
by setting the online-parameter y
o
to the desired operating point.
- Switch to automatic operation.
- Increase Kp slowly until the control loop tends to oscillate due to slight setpoint changes.
- Switch Tv from oFF to 1 s.
- Increase Tv until the oscillations disappear.
- Increase Kp slowly until oscillations reappear.
- Repeat the setting according to the two previous steps until the oscillations can no longer
be eliminated.
- Reduce Tv and Kp slightly until the oscillations are eliminated.

Siemens SIPART DR21 Specifications

General

Brand	Siemens
Model	SIPART DR21
Category	Controller
Language	English