Basic Documentation

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Siemens Rotary actuators with spring return GCA…1 CE1Z4613en
Building Technologies Spring return actuators 2017-05-26
1.3 Document contents
This document contains technical fundamentals on the rotary actuators with spring
return of type series GCA...1 for:
∂ Two-position control
∂ Three-position control
∂ Modulating control, and
∂ Modbus communication
The following topics are discussed:
∂ Type summary and description of the available options
∂ Applications and functions
∂ Actuator design including setting and operating elements
∂ Adjustable auxiliary switches and characteristic function
∂ Notes on engineering and safety-specific guidelines and regulations
∂ Notes on mounting, wiring, and commissioning
∂ Technical data
∂ Diagrams
∂ Notes on environmental compatibility and disposal
2 Spring return actuators
This chapter provides information on application, functions, and equipment
combinations. Furthermore, it contains a type summary and explains the actuator
design including setting and operating elements for this family of actuators.
2.1 Application
Spring-return actuators are used in ventilation and air conditioning plants to operate air
dampers and air throttles:
∂ For damper areas up to 3 m
2
, friction-dependent
∂ In ventilation sections where the actuator must move to the zero position (emergency
position) during power failure
∂ For connection to two-position, three-position, or modulating controllers
∂ For dampers having two actuators on the same damper shaft (tandem-mounted
actuators or powerpack)
Introduction