Basic Documentation

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Siemens Rotary actuators with spring return GCA…1 CE1Z4613en
Building Technologies Spring return actuators 2017-05-26
2.3.2 Function description supplement for GCA16..1
The following information applies to modulating actuators.
Offset Uo and span ΧU can be adjusted using two potentiometers
(see section 3.4 "Adjustable characteristic function"). The maximum permissible input
voltage (Uo + ΧU) is DC 35 V.
Actuators featuring this function can be used for the following applications:
∂ Dampers with a rotary angle limitation, for instance in the 0...45° range, can be
controlled using the full positioning signal range DC 0...10 V.
∂ As a sequencing actuator in control loops that can only apply a DC 0...10 V
positioning signal to control more than one sequence.
∂ In control systems with a positioning signal deviating from DC 0...10 V such as
DC 2...10 V or DC 0…35 V.
2.3.3 Supplementary information on the description of functions
for networked actuators
All process values (setpoints and actual values) and all parameters are implemented as
Modbus RTU registers.
The actuator automatically determines the effective rotary angle range when the
respective parameter is set to “on”. In that case the actuator performs a calibration run
at first startup to determine its actual opening range and adjusts the 0..100% feedback
signal to this opening range.
The table shows the different effects of the characteristic function’s mapping to the
rotary angle range for “inactive self-adaptation” and “active self-adaption”:
Inactive self-adaption Active self-adaption
∂ The actuator calibrates the position
indication with Actual Position =
0..100% for rotary angle = 90°
∂ The actuator calibrates the position
indication with Actual Position = 0..100%
for rotary angle < 90°
2.4 Controllers
The actuators can be connected to all controllers having the following outputs. All
safety-related requirements must be fulfilled (see chapter 4 "Engineering notes").
Actuator type Mode of control Controller output
GCA12..1
Two-position AC 24 V or DC 24…48 V
GCA32..1
Two-position AC 230 V
GCA13..1
Three-position AC 24 V or DC 24…48 V
GCA16..1
Modulating
DC 0...10 V / DC 0...35 V
GCA161.1E/MO Modbus RTU Modbus RTU
Characteristic function
(GCA163.1, GCA164.1
Application
Process values and
parameters
GCA161.1E/MO
Self-adaption of the
rotary angle range
GCA161.1E/MO