Basic Documentation

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Siemens Actuators SAX.., SAY.., SAV.., SAL.. for valves CE1P4040en

Smart Infrastructure Functions and control 2020-01-30

After synchronization the actuator follows the control signal again.

4.7.1.1 Active forced position input on Z

If after return to automatic mode a signal on Z is active (GND, AC/DC 24 V or

0…1000 Ohm) the ClosedPosition-Synchronization is deactivated as long as the

signal on Z remains.

After Z is deactivated the ClosedPosition-Synchronization will be performed.

ClosedPosition-Synchronization is only automatically activated after manual

operation. A power failure does not activate this function automatically, to avoid that

all actuators in a section close in parallel.

If the customer likes synchronization also after a power failure he should take care

that the plant restarting routine drives the actuator automatically into an end

position. This will also synchronize the internal position control and the real

position.

4.8 Calibration

To match the actuator to production-related mechanical tolerances of the individual

valves, accurate positioning and position feedback must be ensured, if calibration

is performed when the plant is commissioned (page 43). During commissioning,

the actuator detects the valve’s end positions and files the exact stroke in its

internal memory.

Calibration takes place in the following phases:

· Actuator drives to H

(1), valve closes. Detection

of upper end position.

· Actuator drives to H

100

(2), valve opens.

Detection of lower end position.

· The detected values are stored (3). Then the

actuator follows the positioning signal.

Note