Distech Controls VA-180GN Series Hardware Installation Manual page 5

Wiring Diagrams for VA-180GNX024F
Figure 16. Connecting Terminals (VA-180GNX024F).
G System potential (SP)
Y1 Positioning signal (actuator's stem extends)
Y2 Positioning signal (actuator's stem retracts)
Accessories
A and/or
1x VA-ASC10.51
Auxiliary Switch
Figure 17. Application.
The wiring diagrams show all possible connections. The application
determines which connections are used.
B
1x VA-ASC10.51
Auxiliary Switch
or 1 x VA-ASZ7.5/..
Potentiometer
Operation for VA-180GNX024F
The actuator accepts a 24 Vac control signal to Y1, which causes the
actuator's stem retainer to move toward the valve (extend). A 24 Vac
control signal to Y2 causes the actuator's stem retainer to move toward
the actuator (retract). The stroke travel is proportional to the length of
time the signal is applied.
When power is turned off or in the event of a power failure, the
actuator maintains its position.
In the 3-position (floating) actuators, deviation occurs (See Figure 18):
-
after several positioning signals Y1 and Y2 in the same direction
since the stroke movement starts with a delay of 300 ms.
-
when positioning signals Y1 and Y2 are active for less than 300
ms since the stroke movement cannot be made in that case.
-
Accurate position feedback is made possible with the help of a
potentiometer.
A B C
Calculated Actual Positioning
position position time [ms]
Figure 18. Three-position (Floating) Actuator Deviation.
Operation for VA-180GNX024P
The actuator accepts a 0 to 10 Vdc or a 4 to 20 mA control signal and
a microprocessor produces a stroke proportional to the input signal.
In the event of a power failure or with no control voltage, the damper
actuator holds its position.
Position Indication
The actuator position indicated by the position output signal "U" is
calculated by a potentiometer that sends a feedback signal via the U
terminal.
Y1 Y2
Positioning signals
(power applied)
Figure 19.
5/10
0
No power
applied