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Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
2 Spring-return actuators
This chapter provides information on application, functions, and device combinations.
Furthermore, it contains a type overview and explains the actuator design including
setting and operator elements for this family of actuators.
2.1 Application
Spring-return actuators are used in ventilating and air conditioning plants to operate air
dampers and air throttles:
∂ For damper areas up to 1.5 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).
2.2 Type summary
The following table shows the options for the actuator types.
GMA...
121.1E 126.1E 321.1E 326.1E 131.1E 132.1E 136.1E 161.1E 163.1E 164.1E 166.1E 161.1E/MO
Control type
Two-position control Three-position control
Modulating control
Modbus RTU
Standard version
Operating voltage
AC 24 V
DC 24…48 V
X X X X X X X X X
AC 24 V
DC 24 V
X
Operating voltage
AC 230 V
X X
Positioning signal Y
X X
DC 0...10 V
DC 0...35 V with characteristic
function Uo, ΧU
X X
Modbus RTU X
Position feedback
U = DC 0...10 V
X X X X
Modbus RTU X
Feedback potentiometer 1kς X
Self-adaptation of
rotary angle range
X
Auxiliary switches (two) X X X X X
Powerpack (two actuators,
tandem-mounted)
X X X X X X X
For functional extensions of the actuators, the following accessories are available:
Universal lever ASK71.9
Rotary/linear set for duct and wall mounting ASK71.11
Rotary/linear set with lever ASK71.13
Rotary/linear set with lever and mounting plate ASK71.14
Weather protection cover ASK75.3
Mounting bracket for tandem-mounted actuators or Powerpack ASK73.3
External auxiliary switches ASC77..E
Data sheet for accessories and spare parts N4697
Introduction
Accessories, spare parts
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