Special characteristics of B, C and D
Behaviour of B and C: The signal is directly activated when reaching the set pivot
point (P).
Behaviour D: The signal is activated shortly before reaching the set pivot point (P).
The switch-on point is determined by pulse duration (+/– range around the pivot
point). Pulse duration depends on parameter
Outer dead band M0148
and amounts
to 1.0 % of the travel for default setting.
Information
For behaviours B and C, the signal might be omitted if, e.g when using a positioner,
pivot point (P) is not fully reached due to the dead band. In this case, behaviour D
can be selected as the dead band is considered.
8.3.3.
Hysteresis for intermediate positions: set
The hysteresis determines the tripping point of the signal.
Example
Parameter
Pivot point 6 M0253
is set to 50.0 % of the travel.
Parameter
Hysteresis 6 M0282
is set to 1.0 %.
Figure 38: Signal behaviour B, C, D for hysteresis = 1 %
P1
Switching on point (
●
)
P2
Switch-off point (
○
)
pT
Pulse duration = 2 times XT + hysteresis
Required user level:
AUMA (6)
.
Customer settings M0041
Intermediate positions M0143
Hysteresis M0267
Hysteresis 1 M0277
Default values:
0.5 %
for all 8 positions
Setting range:
0.0 %
to
5.0 %
of the travel (from OPEN to CLOSED)
Information
For signal behaviour D, the value XT (parameter
Outer dead band M0148
) determines
pulse duration pT and influences switch-on point P1.
8.4.
Operation profile (operation behaviour) for intermediate positions
Conditions
Function <Positioner>, parameter
Positioner M0158
=
Function active
(Required
user level:
Specialist (4)
or higher)
Characteristics
The function <Operation profile> can be used to define the operation behaviour of
the actuator when reaching an end position. Example: The actuator stops and only
continues its operation after another operation command.
This function is required in special applications to avoid water hammer, possibly also
in combination with the timer.
58
Actuator controls
Application functions
ACV 01.2/ACVExC 01.2 Profibus DP
