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TM
OpenAir
NSR Rotary Electric Damper Actuator
24 Vac 3-position Control
Operation
Life expectancy
Dual auxiliary switch
Siemens Building Technologies, Inc.
GBB/GIB13x
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.
If you want to reverse the direction of rotation, wires 6 and 7 (Y1 and Y2) may be
interchanged. Reverse the position indicator so that the counterclockwise 0 to 90 scale
is visible. See Figure 16.
In the event of a power failure or with no control voltage, the damper actuator holds its
position.
In the event of a blockage in the damper, the actuator is overload protected over the full
range to prevent damage to the actuator.
An improperly tuned loop will cause excessive repositioning that will shorten the life of
the actuator.
GBB/GIB136
-2,5
0
10
20
30
A
0
10
20
30
92,5 90
80
70
60
NOTE:
The auxiliary switch setting shafts turn together with the actuator. The scales
are valid only when the actuator is in the "0" position on clockwise motion.
To change the settings of A and B, use a
flat-blade screwdriver to turn the switch
adjustment dials to the desired setting at
which a signal is to be given.
Factory setting
Switch A
Switch B
Actuator Scale:
70
80
90 92,5
clockwise
Adjustment range for Switches A and B
B
Setting interval: 5°
70
80
90
Switching hysteresis: 2°
Actuator Scale:
20
10
0
-2,5
Counterclockwise
5°
85°
Figure 12. Dual Auxiliary Switch Dials.
Technical Instructions
155-177P25
December 15, 2004
10
20
A
AUX
40
70
SWITCH
20
90
ADJ
30
B
80
40
70
50
60
Page 7
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