Gossen MetraWatt R2080 - Adjusting Control Performance - Manual Self-Tuning

18 GOSSEN METRAWATT GMBH
Adjusting Control Performance – Manual Self-Tuning
Parameters Pb 1, Pb 11, tu and tc are determined by means of manual self-tuning in order to maintain opti-
mized controller dynamics. An actuation test or an oscillation test is performed to this end.
Preparation
– Complete configuration (page 25) and parameters configuration (page 16) must first be entered for use of the
controller.
– The actuators should be deactivated with the off function (page 15).
–A recorder must be connected to the sensor and adjusted appropriately to prevailing circuit dynamics and
the setpoint.
– For 3-step controllers, on and off-time must be recorded for switching output I (e.g. with an additional
recorder channel or a stopwatch).
– Configure as limit transducer (controller sort = 0) (see page 25).
– Set read-out cycle time to the minimum value: tc = 0.5.
– Deactivate PWR limiting. YH = 100.
– Reduce (or increase) the setpoint so that overshooting and undershooting do not cause any impermissible
values.
Performing the Actuation Test
– dbnd = MRS Setting for 3-step controller (switching output II may not be triggered)
dbnd = 0 Setting for step-action controllers (switching output II must be triggered)
– Start the recorder.
– Activate the actuators with automatic operation.
– Record two overshoots and two undershoots.
The actuation test is now complete for 2-step and step-action controllers.
Continue as follows for 3-step controllers:
–Set dbnd to 0 in order to cause further overshooting with active switching output II. Record two overshoots
and two undershoots.
Record on-time T
I
and off-time T
II
at switching output I or the continuous output for the last oscillation.