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Siemens
Actuators SAX.., SAY.., SAV.., SAL.. for valves
CE1P4040en
Building Technologies
Functions and control
2018-12-05
4.14.5 Electrical accessories
The auxiliary switch ASC10.51 switches on or off when a certain position is
reached. The switching point can be set between 0…100%.
Switching point for S1–S2 and
S1–S3 cannot be set separately.
If S1–S2 is open then S1–S3 is
closed.
Adjustable switching
point
When using an auxiliary switch, position feedback can trigger an automatic stop of
the circulating pump in the end position "Fully closed".
Potentiometer ASZ7.5 delivers an ohmic
value to the controller giving the exact
position of the actuator (continuous position
feedback). A slip clutch prevents damage to
the potentiometer in the mechanical end
positions. This is also used for accurate
balancing of the potentiometer in the fully
closed position.
Ohmic value between P2-P1 increases
with stroke H or rotation, ohmic value
between P2-P3 decreases.
The end values of the potentiometers refer to the maximum stroke / maximum
angular rotation of the actuators. For this reason, the resulting values in operation
deviate, depending on the type of valve used in combination with the actuator. The
potentiometer's starting point can be very accurately adjusted during installation
(refer page 37).
ASZ7.5
770 Ohm at nominal stroke/nominal
angular rotation
R = 0 + 7.7 Ohm x nominal
stroke/nominal angular rotation (%)
SAX..
R = 0 + 38.5 Ohm x stroke (mm)
SAV..
R = 0 + 19.3 Ohm x stroke (mm)
SAL..
R = 0 + 8.55 Ohm x rotary angle (°)
Pote
ntio
meter
mea
su
ri
ng
va
lue
[oh
m]
Actuator position in relation to nominal stroke/nominal angular rotation [%]
AC 24 V...230 V / 6 (2) A
S3 S2
S1
Auxiliary switch
ASC10.51
Application example:
Potentiometer
ASZ7.5/..
Flow characteristic
770
154
104
770
154
104
