ASZ6.6 (S55845-Z108)
Stem heater
● For media below 0 °C
● Mount between valve and actuator
ASK51
Mechanical stroke inverter
● 0% actuator stroke corresponds to
100% valve stroke
● Mount between valve and actuator
ASC9.3
Double auxiliary switch
● Adjustable switching points
ASZ7.3
Potentiometer
● 0…1000 Ω
ASC1.6
Auxiliary switch
● Switching point 0...5% stroke
ASZ7.3
For the combination SIMATIC S5/S7 and use of positioning feedback, we recommend
actuators with DC 0...9.8 V feedback signals.
The signal peaks that occur in the potentiometer ASZ7.3 may result in error messages on
Siemens SIMATIC. This is not the case when combined with Siemens HVAC controllers.
The reason is that SIMATIC has a higher resolution and faster response time.
Use the potentiometer as voltage divider on the 3-
wire connection. Powering the potentiometer over the
wiper may shorten the life cycle of the potentiometer.
Signal peaks increase in frequency and scope over
the lifespan in this operating mode.
For more information, see Technical data [➙ 19]
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