Basic Documentation

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Siemens Rotary actuators with spring return GCA…1 CE1Z4613en
Building Technologies Technical design 2017-05-26
3 Technical design
This chapter discusses the following topics:
∂ Drive motor and spring return
∂ Adjustable auxiliary switches
∂ Adjustable characteristic function (setpoint signal, DC 0...35 V)
∂ Control characteristics by including the neutral zone
3.1 Drive motor and spring return
The brushless DC motor allows for accurate speed control, torque supervision to
protect the actuator and dampers, and provides a reliable spring return function.
The spring return force is stored in a spring which returns the actuator to the zero
position in the case of power failure.
3.2 Angular range and mechanical limitation
The illustration below shows the relationship between the inner and outer mechanical
limitation of the angular range.
Gear train angular range
Inner mechanical limits
5°0° 20° 40° 60° 80°
5°
95°
0° 95°
97.5°
-2.5°
40° 95°
Χ
= 62.5°
x 5°= 7 5°· ·
x >1
x = 0
Χ = 95°-x 5° +2.5°
Χ = 95°
·
0°
4614D10
2
0°-5° 90°
1
Outer mechanical limits
Adapter setting range
Actuator angular range
(without rotary angle limitation)
• Gear train presetting
(factory setting)
Pointer
Angular scale
Angular limitation
Adapter setting
Example: x = 7
x = number of steps (5°)
‚ incl. gear train presetting
Introduction
Drive motor
Spring return
Mechanical functions