8 Actuator and feedback
48 Positioner DC 6-06
8 Actuator and feedback
The HEINZMANN control units with conventional injection can work with actuators with
different methods of operation and feedback. They can trigger actuators with either
2-quadrant operation (electrically energized on one side, with a strong spring return) or with
4-quadrant operation (electrically energized on both sides).
Depending on the actuator type, an analogue or a digital signal is used to feed back the
actuator position. With an analogue signal the information about the actuator position is
contained in the size of the d.c. voltage signal, whereas with a digital feedback the actuator
position is computed from time intervals between pulses. As well as the measurement signal
for the actuator position, actuators with digital feedback have a reference signal. The
reference signal is used to compensate for temperature variations in the feedback which might
affect the measurement signal.
For some actuators, the evaluation of the feedback must be inverted (small feedback signal
with a large filling and vice versa).
The actuator is activated with the parameter 5910 ActuatorOn.
The operatio
n of the amplifier is selected with the parameter
5911 Amplifier2QOr4Q = 0
4-quadrant amplifier
5911 Amplifier2QOr4Q = 1 2-quadrant amplifier (with return spring)
and the type of feedback of the actuator is set with the parameter
5950 FeedbDigitalOrAn
alog = 0 Analogue feedback
5950 FeedbDigitalOrAnalog = 1 Digital feedback.
Whether the feedback signal falls or rises as the filling increases can be set separately with the
following parameter:
5951 FeedbSlopeFallOrRise = 0
Rising feedback signal for actuator 1 as filling
increases
5951 FeedbSlopeFallOrRise = 1 Falling feedback signal for actuator 1 as filling
increases
Parameters 5911 Amplifier2QOr4Q, 5950 FeedbDigitalOrAnalog and 5951
FeedbSlopeFallOrRise are not active until after
3.2 Saving the data and
3.7 Resetting a control unit.
After a re-start, a reset or a stop request, the control unit usually energizes the actuator for
safety for 5 seconds with the simultaneous output of an actuator position setpoint 0 %, and
then switches the current off.
Note
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