OpenAir™ GCA Series Spring Return 160 lb-in Electronic Damper Actuator
Technical Instructions
Document No. 155-173P25
May 19, 2014
Siemens Industry, Inc.
Page 9
In the event of a power failure or when the operating voltage is shut off, all actuator
models will return to the 0 position.
In the event of a blockage in a damper, actuators are overload protected over the
full range to prevent damage to the actuators.
Life expectancy
An improperly tuned loop will cause excessive repositioning that will shorten the life
of the actuator.
Control Signal
Adjustment
GCA 163 and GCA164
The offset (start point) and span of the control signal can be adjusted. The offset,
Uo, can be adjusted between 0 to 5 Vdc. The span,
∆
U, can be adjusted between
2 to 30 Vdc.
Ys
Mechanical positioning range
(100% = angle of rotation 90°)
Yu
Control signal
Uo
Offset (start point)
∆
U
Span
Uo = 0V,
∆
U = 2V
The minimum working range for Ys = 100%
1. Uo = 5V,
∆
U = 30V The maximum
working range for Ys = 100%
2. Uo = 0V,
∆
U
≈
10V Factory setting
Setting for
10V span
0V offset
Figure 14. The Minimum and Maximum Control Signal Adjustment.
Example:
Open the actuator from 0% to 50% (45°) using a control signal of
Umin = 2V to Umax = 10V.
Calculating the value of
∆
U:
V
16
50
2)
(10
x
100
%
in
rotation
of
angle
Working
min)
U
max
(U
%]
[
100
U
=
−
=
−
=
∆
