AUMA ACVExC 01.2 Series User Manual

8.5.2. Adaptive behaviour: switch on or off
Adaptive positioning may reduce the number of starts and compensate for the overrun
of the actuator.
Customer settings M0041
Positioner M0145
Adaptive behaviour M0147
Default value: Adaptive I
Setting values:
Off
Adaptive behaviour switched off.
Adaptive I
Adaptive behaviour for precise positioning (high positioning accuracy).
Due to the inertia of actuator and valve, the valve position changes only slightly after
switching off the actuator (overrun). The positioner determines the resulting error
between setpoint and actual value for both directions and automatically adapts the
inner dead bands Xi and therefore switching point P2.
On the basis of the determined inner dead bands Xi and the set hysteresis
(parameters Posit. hyst. OPEN M0598 or Posit. hyst. CLOSE M0599), the outer
dead bands X
T
are automatically determined.
This reduces the error caused by the overrun after only a few operations and a high
positioning accuracy is achieved.
Figure 39: Positioner positioning behaviour
E1 Target value
E2 Actual value
P1 Switch-on point
P2 Switch-off point in direction OPEN
P3 Setpoint reached
X
T
Max. error (outer dead band)
Xi
1
Overrun in direction OPEN (inner dead band OPEN)
Xi
2
Overrun in direction CLOSE (inner dead band CLOSE)
Adaptive II
Contrary to adaptive positioner 1, adaptive positioner 2 will not be subject to
oscillation.
8.5.3. Overrun (inner dead band): set manually
The inner dead band determines the switch-off point of the actuator and therefore
influences the overrun.
The inner dead band may be set individually for the directions OPEN and CLOSE.
Manual setting is only possible if the adaptive behaviour, parameter Adaptive
behaviour M0147 is switched off.
53
Actuator controls
ACV 01.2/ACVExC 01.2 Application functions

AUMA ACVExC 01.2 Series Specifications

General

Brand	AUMA
Model	ACVExC 01.2 Series
Category	Controller
Language	English