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Siemens Actuators SAX.., SAY.., SAV.., SAL.. for valves CE1P4040en
Building Technologies Functions and control 2018-12-05
Actuator
Positioning signal Y, Z
Actuator
Position feedback U
Direct acting
Reverse acting
Y, Z Positioning signal
H Stroke
U Position feedback
Acting direction: direct
Acting direction: reverse
4.7 Position control with ClosedPosition-
Synchronisation
Within SAX/SAV/SAL61/SAY61.. actuators the position control works based on the
HALL-sensor pulses from the brushless DC-motor calculating with an internal
stroke model calculating the actual position. This kind of control is more accurate
and wearless compared with a physical element for position measurement and
grants a precise position control with high resolution.
During manual operation the motor is declutched from the gear train and the
internal position control get’s not sensor pulses. So real position will deviate from
the internally calculated position. As a consequence the position feedback on
terminal U is set to “0V” during manual operation.
To grant – after manual operation – that real mechanical position and internal
position control are matching all SA..61.. operate after manual operation an
automatic ClosedPosition-Synchronisation.
4.7.1 ClosedPosition-Synchronisation
Returned into automatic operation the actuator runs for 0.5.. 2 s into opening
direction to grant secure closed-position detection. Then the actuator runs into
closed position (seat A-AB in the valve). Reaching the closed position the internal
stroke model is synchronized. Positioning signal, position feedback and
meachnical position now match perfectly again.
With this function it’s granted that the position feedback U – which was zero during
manual operation and synchronization - always represents the real mechanical
position of the actuator.
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