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Aktor M
Technical description
3. Technical description
3.1
Design
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Fig. 1:
Design - side view
1
Cover
2
Handwheel
3
Current stroke position
4
Crossbeam
5
Position marker for lower valve control
6
Position marker for upper valve control
3.2
Functional description
The electromotive actuator Aktor M 24 V for Cocon QTR/
QFC is used for the finely graduated stroke adjustment of
Cocon QTR/QFC valves in nominal sizes DN 40 to DN 100
with a positioning force of 1000 N.
The actuator can be controlled with a modulating signal as
well as with floating and on/off signals.
The actuator has self-adjusting position markers for stroke
indication. The position indication is realised by a sliding
bridge within the position markers.
For valve monitoring, an automatic valve blocking
monitoring with elimination programme is integrated.
The operating mode selector switch can be used to switch
the actuator to manual mode.
115802384-V01.10.2022
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2
3
4
3.2.1
Automatic blocking logarithm with fault
message
If a blockage occurs within the valve stroke due to foreign
bodies in the pipeline, the actuator signals this fault by
means of a feedback signal.
Setting
Feedback signal
V (DIP B2 = ON)
The actuator signals the fault
with a feedback signal of 12.5 V
mA (DIP B2 = OFF)
The actuator signals the fault
with a feedback signal of 0 mA.
By means of an automatic elimination logarithm, the
actuator then tries to eliminate the blockage several times
on its own by lifting the valve plug for a short time.
3.2.2 Switchable end position hysteresis
The end position hysteresis is the point at which the
actuator moves to the end position.
For the hysteresis, the values 0.5 V (1 mA) or 0.2 V
(0.4 mA) are set via DIP switch A1.
Example: With hysteresis 0.5 V, the end position is moved
at Yin < 0.5 V and > 9.5 V. In this case, the feedback is a
signal of 0 V or 10 V.
3.2.3 Feedback
The feedback can be inverted separately from the Yin via
DIP switch B4. The output of the feedback can be
switched between absolute and relative position via DIP
switch A2. The signal is output in 2..10 V or 4..20 mA when
DIP switch B5 is in ON position.
3.2.4 Actuator heating
The actuator heating is used to prevent condensation at
low temperatures.
The function is activated via DIP switch A3.
3.2.5 Priority switch
The priority switch is a direct control and superimposes
the modulating Y input signal for a valve position Open or
Closed on terminals 2 or 3 (e.g. frost protection or
limitation).
3.2.6 Valve blocking protection
If the system conditions permit, the valve blocking
protection can be activated during commissioning.
The valve blocking protection prevents the plug from
getting stuck when the valve is at a standstill for a longer
period of time during summer break in heating systems.
When the valve blocking function is activated, the valve
plug is lifted for a few seconds if there has been no stroke
movement within 21 days.
This functionality can be activated via DIP switch B1.
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