Technical Design; Drive Motor And Spring Return; Rotary Range And Mechanical Limitation - Siemens OpenAir GMA 1 Series Technical Basics

Introduction
Motor technology
Spring return
Mechanical functions
Gear train rotary range
Inner mechanical limits
Outer mechanical limits
Adapter setting range
Actuator rotary range
(without rotary angle limitation)
①
Gear train presetting
(factory setting)
Pointer
Rotary angle scale
Rotary angle limitation
Adapter setting
Example: x = 7
x = number of steps (5°)
②
incl. gear train presetting
12/44
Siemens
Building Technologies
3

Technical design

This chapter discusses the following topics:

∂ Drive motor and spring return

∂ Adjustable auxiliary switches
∂ Adjustable characteristic function (positioning 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

Rotary range and mechanical limitation

The illustration below shows the relationship between the inner and outer mechanical
limitation of the rotary range.
0°
-2.5°
0°
-5°
0°
GMA..1 actuators with spring return
5° 20° 40°
1
0°
5°
40°
x 5°= 7 5°
· ·
x >1
x = 0
60° 80°
Χ = 62.5° 2
Χ = 95°-x 5° +2.5°
·
Χ = 95°
95°
97.5°
95°
90°
95°
CM2Z4614en
2018-01-11