Detection Of Foreign Bodies; Forced Control Z - Siemens Acvatix SAS31.03 Manual

30 / 50
Siemens
Building Technologies
4.2.6

Detection of foreign bodies

The actuator detects when the valve is clogged and adjusts its operational behavior
accordingly to prevent damage to itself or the valve.
If the actuator hits an obstacle within the calibrated stroke and is not able to
overcome it with its nominal positioning force, it stores the position at which the
obstacle was hit. Depending on the direction of travel, as ...
"Upper limit of valve clogging", if the clogging was detected when
traveling in the direction of "Actuator's stem extending".
Now, the status LED blinks red and the actuator only follows the positioning signal
between the positions "Actuator's stem retracted" and "Lower limit of valve
clogging".
After detection of clogging, 3 attempts are made to overcome clogging by traveling
about 15% in the opposite direction and then trying again to overcome the position
of clogging. If the attempts made are unsuccessful, the actuator continues to follow
the positioning signal within the restricted range only and the LED continues to
blink red (see "Status indication " page 34).
4.2.7

Forced control Z

Forced control uses the following operating modes:
No function
Equal-percentage or
linear characteristic
Contact "Z" not
connected,
valve follows
positioning signal "Y"
Actuators SAS.., SAT.. for valves
Functions and control
Z mode
Fully open
Contact "Z" is Contact "Z" is
connected directly to connected directly to
"G",
positiong signal "Y" positiong signal "Y" has
has no impact
Overriding
Fully closed positioning signal "Y"
by 0...1000 Ω
Equal-percentage or
linear characteristic
Contact "Z" is
connected to "M" via
resistor "R",
starting point at 50 Ω,
"G0",
end point at 900 Ω,
no impact positioning signal "Y"
has no impact
CE1P4041en
2015-05-19