Install Instructions

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions
Document Number 155-315P25
March 6, 2018
Siemens Industry, Inc. Page 11
Control Signal
Adjustment
(Offset and Span)
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.
GMA163
GMA164
Ys Mechanical positioning range (100% = angle of rotation 90°)
Yu Control signal
Uo Offset (start point)
∆U Span
1. Uo = 0V, ∆U = 2V The minimum working range for Ys = 100%
2. Uo = 5V, ∆U = 30V The maximum working range for Ys = 100%
3. Uo = 0V, ∆U ≈ 30V Factory setting
Factory Setting
of 30V span
0 offset
Figure
11
. 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:
V16
50
2)(10 x100
%inrotationofangleWorking
min)Umax(U%][100
U =
−
=
−
=∆
Settings
Uo = 2V; ∆U = 16V
Umin = minimum control signal
Umax = maximum control signal
Figure 12. Example.