Calibration; Signal Priorities - Siemens Acvatix SAX Series Basic Documentation

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Examples
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Siemens
Building Technologies
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 46). 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
0
of upper end position.
· Actuator drives to H
100
Detection of lower end position.
· The detected values are stored (3). Then the
actuator follows the positioning signal.
· Observe status indication (actuator LED) during and after calibration (page 74).
· If the actuator does not detect the second end position within an appropriate
stroke range (SAX.., SAY.. max. 25 mm; SAV.. max. 45 mm), the first end stop
will be adopted and the actuator operates with a working range of 20 mm,
respectively 40 mm.
4.9

Signal priorities

The actuators are controlled via different interlinked positioning signal paths
(positioning signal "Y", forced control input "Z", manual adjuster). The signal paths
are assigned the following priorities:
Priority
The manual adjuster always has priority 1, thus overriding all signals active at
1
(highest)
"Z" or "Y", independent of whether or not power is applied.
Only SA..61..: As soon as a valid positioning signal is active at input "Z", the
2 position is determined via positioning signal "Z" (forced control). Prerequisite:
The manual adjuster is not used.
The position is determined via positioning signal "Y". The manual adjuster is
3
(lowest)
not used and on Z there is no active signal.
Manual Forced
adjuster control (Z)
Automatic Not
mode connected
Automatic
G
mode
Automatic
G0
mode
Operated
(30%) and G
engaged
Bold printing = positioning signal currently active
Actuators SAX.., SAY.., SAV.., SAL.. for valves
Functions and control
(1), valve closes. Detection
(2), valve opens.
Description
Positioning
Stroke actuator
signal (Y)
Actuator's stem travels to
5 V
position (50%)
3 V Actuator's stem extends
3 V Actuator's stem retracts
Actuator's stem retracts
8 V
manual (to 30%)
Z
Y
Rotary actuator
Actuator's spindle travels to
position (50%)
Actuator's spindle turns in
clockwise direction
Actuator's spindle turns in
counter-clockwise direction
Actuator's spindle turns
manual in counterclock-
wise direction (to 30%)
CE1P4040en
2018-12-05