V3.3 07.2016•
Subject to modifi
cation
UL marked actuators is optional, please contact your local Sales Representative for details.
9
Control characteristics
The velocity of the medium is measured in the measuring component (sensor electronics)
and converted to a flow rate signal.
The positioning signal Y corresponds to the power Q via the exchanger, the volumetric
flow is regulated in the EPIV. The control signal Y is converted into an equal-percentage
characteristic curve and provided with the
.max value as the new reference variable w. The
momentary control deviation forms the positioning signal Y1 for the actuator.
The specially configured control parameters in connection with the precise flow rate sensor
ensure a stable quality of control. They are however not suitable for rapid control processes,
i.e. for domestic water control.
U5 displays the measured volumetric flow as voltage (factory setting). As an alternative, U5
can be used for displaying the valve opening angle.
Block diagram
D
A
U
5
PP/MP
D
A
w
max
M
A
D
k
DN
Y
1
Y
1)
1)
Definitions
nom is the maximum possible flow.
Creep flow suppression
Given the very low flow speed in the opening point, this can no longer be measured by the
sensor within the required tolerance. This range is overridden electronically.
Opening valve
The valve remains closed until the volumetric flow required by the positioning signal Y
corresponds to 1% of nom(DN15-DN50) / 2.5% of nom(DN65-DN150). The control along
the valve characteristic curve is active after this value has been exceeded.
Closing valve (DN15-DN50)
The control along the valve characteristic curve is active up to the required flow rate of 1%
of nom. Once the level falls below this value, the flow rate is maintained at 1% of nom. If
the level falls below the flow rate of 0.5% of nom required by the reference variable Y, then
the valve will close.
Closing valve (DN65-DN150)
The control along the valve characteristic curve is active up to the required flow rate of 2.5%
of nom. Once the level falls below this value, the flow rate is maintained at 2.5% of
nom.
If the level falls below the flow rate of 1.25% of nom required by the reference variable Y,
then the valve will close.
D
A
U
5
PP/MP
D
A
w
max
M
A
D
k
DN
Y
1
Y
1)
1)
max is the maximum flow rate which has been
set with the greatest positioning signal, e.g. 10V.
max can be set to between 30% and 100% of
nom.
min 0% (non-variable).
0
100%
30%
100%
nom
max
Y [V]
[m
3
/h]
EP..R+MP / P6..W..E-MP
Product features
