8 Actuator and feedback
50 Positioner DC 6-06
For actuators with digital feedback, the reference signal 3955 FeedbackRef must also be
entered in parameter 1955 FeedbackReference. The referen
ce signal does not change
over the entire range of the actuator.
With manual calibration, these parameters are only active after
3.2
Saving the data and
3.7 Resetting a control unit.
The control unit can now scale the measured value of the feedback and display in
exactly in 3960 FeedbackCorrection. The actuato
r position can be checked with
parameter 2300 ActPos, which displays the current control path of the actuator.
8.1.2 Automatic calibration
If necessary, automatic calibration can be performed by the PC or hand programmer
(
3.3 DcDesk 2000), with a pushbutton on the PCB or the switch function 2845
SwitchAutoAdjust which is activated by a digital input. Please refer to
8.1.2.1 Saving
the calibration data without fail!
Automatic actuator calibration cannot be started if a fatal error is present
or a setpoint not equal to 0 % is selected.
With automatic calibration, the control unit measures the reference values by itself. It
does this by energizing the actuator for a certain time to ensure that the minimum or
maximum position is positively reached, then measures the reference values. The
measured values are entered in the corresponding parameters
1950 FeedbackRef_0%
for the minimum position and
1951 FeedbackRef_100%
for the maximum position and unlike manual calibration they are immediately available.
The time during which the control unit energizes the actuator and waits for the
minimum or maximum position to be positively reached is defined by the parameter
1900 Feedback-Adjus
tTime
The level of current for automatic calibration is determined by the parameter
1919 Servo
CurrentAdjust
The error
3059 ErrFeedbackAdjust
can occur d
uring automatic calibration. The cause of this error is described in Chapter
10.8 Error parameter list which also gives guidance on remedying the problem.
Note
Note
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