3-Position Output (3-Point) - Siemens Synco 200 Basic Documentation

Purpose of 3-POINT
Activation
Connection diagram
Note
Calculation of
positioning signal
Synchronization
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Building Technologies
8.7

3-position output (3-POINT)

8.7.1 Purpose and activation
The 3-POINT (3-position output) function block controls a modulating controlling
element (valve) with a 3-position actuator (open / standstill / close). This requires 2
switching outputs (open / close).
You can only activate the 3-position output in the RLU202 and RLU222 universal
controllers. To do so, make setting "3P" on the configuration menu.
Relays Q1 and Q2 must not be occupied by other functions.
L
G
G
G0 Q12
N1
Y1
G0
N
For 3-position control of a controlling element operating on AC 230 V, you must
activate the interference suppression element in the controller. To do so, connect
terminal N1 to the neutral conductor, and install a wire link between N1 and N2.
8.7.2 Operating principle
The controller uses the duration of the open and close commands and the entered
actuator running time (ACTTIME) to calculate the actuator's present position
(stroke model). This is compared with the present positioning setpoint. If the result
is a deviation, the controller issues an open or close command.
When the actuator reaches the end positions (fully closed or fully open), the
controller synchronizes the actuator with the stroke model (end position
synchronization). To do so, the controller issues the appropriate positioning
command for a period 1.5 times the entered actuator running time (ACTTIME).
If the actuator shall maintain the end position, end position synchronization (see
above) is repeased at 10-minute intervals.
Universal Controllers RLU2...
Aggregates
Q11 Q23
Q14 N2 Q24
N1
Y2
N
Y
CE1P3101en
29.08.2008