Manual Setting Of The Control Parameters - Siemens SIPART DR22 Manual

4 Commissioning

4.6 Manual setting of the control parameters

4.6 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 loop stable in any case, the following factory settings must be made (the
values apply for both parameter sets):
Proportional action factor Kp = 0.1
Integral action time
Derivative action time
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 working point can also be entered manually
by setting the online parameter Yo 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 entered manually
by setting the online parameter Yo 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.
D Pi controller (control signal P* = low)
-- Set the desired setpoint and set the control difference to zero in manual operation.
-- 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.
-- Reduce Tn until the control loop tends to oscillate again.
-- Increase Tn slightly until the tendency to oscillate disappears.
224
Tn = 9984 s
Tv = oFF
Manual
SIPART DR22 6DR2210
C79000-G7476-C154-03