Operation; Auxiliary Switches - Siemens OpenAir GDE Series Technical Instructions

OpenAir ™ Non-Spring Return Rotary Electric Damper Actuator
24 Vac 3-position Control

Operation

Life expectancy

Auxiliary switches

GDE/GLB136.1P
Sizing
Siemens Building Technologies, Inc.
A floating control signal controls the damper actuator. The actuator's angle of rotation is
proportional to the length of time the signal is applied. A 24 Vac control signal to wires 1
and 6 (G-Y1) causes the actuator coupling to rotate clockwise. A 24 Vac control signal
to wires 1 and 7 (G-Y2) causes the actuator coupling to rotate counterclockwise.
To reverse the direction of rotation, the wires 6 and 7 (Y1 and Y2) can be interchanged.
In the event of a power failure or with no control voltage, the damper actuator holds its
position.
An improperly tuned loop will cause excessive repositioning that will shorten the life of
the actuator.
Figure 3 shows the adjustable switching values for the auxiliary switches A and B.
Actuator Scale:
clockwise
Adjustment range for
Switches A and B
Setting interval: 5°
Switching hysteresis:
2°
Actuator Scale:
counterclockwise
NOTE: The auxiliary switch setting shafts rotate with the actuator. The scale is valid
only when the actuator is in the "0" position on clockwise motion.
Use the long arm of the X to point to the position of switch A. Use the narrower tab on
the red ring to point to the position of switch B.
The type of actuator required depends on several factors.
1. Obtain damper torque ratings (ft-lb/ft
manufacturer.
2. Determine the area of the damper.
3. Calculate the total torque required to move the damper:
Total Torque =
1
Safety Factor: When determining the torque of an actuator required, a safety
factor should be included for unaccountable variables such as slight
misalignments, aging of the damper, etc. A suggested safety factor is 0.80 (or
80% of the rated torque).
4. Select the actuator type from Table 2.
-2,5 0 10 20 30
A
0 10 20 30
60
92,5 90 80 70
Figure 3. Adjustable Switching Values for
the dual auxiliary Switches.
2
or Nm/m
Torque Rat ing
SF
Technical Instructions
Document No. 155-188P25
Rev. 3, August, 2001
70 80 90 92,5
B
70 80 90
-2,5
20 10 0
2
) from the damper
×
Damper Ar ea
1
A ˚ B
10 20
80 70 60 50
AUX SWITCH
ADJUSTMENT
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