Siemens OpenAir GMA 1 Series Installation guide

OpenAir
GMA..1 actuators with spring return
Technical basics
Edition 2.3
CM2Z4614en
2018-01-11
Building Technologies

2/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2017-05-08

3/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies Table of contents 2018-01-11
Table of contents
1Introduction ................................................................................................... 5
1.1 Revision history............................................................................................. 5
1.2 About this document ..................................................................................... 5
1.3 Document contents ....................................................................................... 6
2Spring-return actuators ................................................................................. 7
2.1 Application .................................................................................................... 7
2.2 Type summary .............................................................................................. 7
2.3 Description of functions................................................................................. 8
2.3.1 Function description supplement for GMA16..1............................................ 9
2.3.2 Supplementary information on the description of functions for networked
actuators ....................................................................................................... 9
2.4 Controllers..................................................................................................... 9
2.5 Structure and design................................................................................... 10
2.6 Setting and operator elements.................................................................... 11
3Technical design......................................................................................... 12
3.1 Drive motor and spring return .....................................................................12
3.2 Rotary range and mechanical limitation...................................................... 12
3.3 Auxiliary switches and positioning signals .................................................. 13
3.4 Adjustable characteristic function ............................................................... 14
3.5 Neutral zone................................................................................................ 15
4Engineering notes....................................................................................... 16
4.1 Safety notes ................................................................................................ 16
4.2 Device-specific regulations ......................................................................... 17
4.3 Notes on EMC optimization ........................................................................ 18
4.4 Determining the actuator............................................................................. 18
5Mounting notes ........................................................................................... 20
6Wiring notes ................................................................................................ 21
6.1 Permissible line length and cross-sectional areas...................................... 21
6.2 Actuator wiring (two-position)...................................................................... 23
6.3 Actuator wiring (three-position) ................................................................... 23
6.4 Actuator wiring (modulating) ....................................................................... 24
6.4.1 AC 24 V supply ........................................................................................... 24
6.4.2 DC 24 V supply ........................................................................................... 25
6.5 Actuator wiring (Modbus RTU).................................................................... 26
7Commissioning notes.................................................................................. 27

4/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies Table of contents 2018-01-11
7.1 General checks ...........................................................................................27
7.2 Electrical function check..............................................................................27
7.3 Modbus .......................................................................................................29
7.3.1 HMI – Human-machine interface ................................................................29
7.3.2 Push button addressing ..............................................................................30
7.3.3 Commissioning............................................................................................31
7.3.4 Modbus registers.........................................................................................32
7.3.5 Parameter and function description ............................................................34
8Technical data .............................................................................................35
9Diagrams.....................................................................................................37
9.1 Internal diagrams ........................................................................................37
9.2 Cable labeling .............................................................................................37
9.3 Connection diagrams (two-pos./three-pos.) ................................................38
9.4 Connection diagrams (modulating) .............................................................39
9.4.1 Typical application.......................................................................................39
9.4.2 Special switchings for modulating control ...................................................40
9.5 Connection diagrams (networked) ..............................................................41
9.5.1 Typical application.......................................................................................41
10 Environmental compatibility and disposal ...................................................41
11 Appendix .....................................................................................................42
11.1 Dimensions .................................................................................................42
11.2 Referenced documents ...............................................................................43

5/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
1 Introduction
1.1 Revision history
Changes Date Chapter Pages
Type summary
22.01.2004
2.2 6
Description of functions 2.3.1 7
Electrical parallel connection of actuators 4.2 16
Technical data (without type GMA19... 8 27/28
Referenced documents (related to GMA) 11.2 35
Self-adaptation (diagram /example) 07.05.2004 3.4 12
Self-adaptation (position indicator GMA16..1) 7.2 26
Operating voltage DC 24…48 V 07.06.2004 whole document
Accessorie ASC77.. 2.2 6
Permissible line length and cross-sectional areas
14.02.2005
6.1 19/20
Environmental compatibility and disposal 10 33
Referenced documents 11.2 34
Auxiliary switch 19.10.2006 828
Internal diagrams 9.1 29
EU and RCM Conformity
26.02.2016 828
European Directive 2012/19/EU 10 33
Added type GMA161.1E/MO 08.05.2017 whole document
1.2 About this document
This document targets engineering, product management, and commissioning staff in
the market areas.
This document provides basic knowledge. In addition to background information, it
contains general technical fundamentals on the GMA..1 actuator series.
It offers all information on engineering, correct mounting and wiring, commissioning,
and service.
Chapter 11.2 "Referenced documents" contains a list of documents on rotary and linear
actuators with accessories.
Main audience
Purpose
Referenced documents

6/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
1.3 Document contents
This document contains technical fundamentals on the actuators with spring return of
type series GMA..1 for:
∂Two-position control
∂Three-position control
∂Modulating control, and
∂Modbus communication
The following topics are discussed:
∂Type overview and description of the available options
∂Applications and functions
∂Actuator design including setting and operator elements
∂Adjustable auxiliary switches and characteristic function
∂Notes on engineering and safety-specific guidelines and regulations
∂Notes on mounting, wiring, and commissioning
∂Technical data
∂Connection diagrams
∂Notes on environmental compatibility and disposal

7/44
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 m2, 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, ΧUX X
Modbus RTU X
Position feedback
U = DC 0...10 V XXXX
Modbus RTU X
Feedback potentiometer 1kςX
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

8/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
2.3 Description of functions
The functions are listed in a table and are assigned to the respective control types.
Type GMA12..1 / GMA32..1 GMA13..1 GMA16..1 GMA161.1E/MO
Control type Two-position control Three-position control Modulating control Modbus RTU
Positioning signal with adjustable
characteristic function - -
Y = DC 0...35 V with
offset Uo = 0...5 V
and
span ΧU = 2...30 V
-
Rotary movement,
rotary direction
Clockwise or counter-clockwise movement depends on the mounting position of the damper shaft.
When operating voltage
is supplied, the actuator
goes from 0° ⇑90°.
When operating voltage
is supplied and
depending on the
control, the actuator
goes
∂from 0°⇑90° (open)
∂from 90°⇑0° (close)
When control is
interrupted, the actuator
remains in the
respective position.
-
On the setting of the
respective parameter
Spring return On power failure or when the operating voltage is switched off, the spring return moves the actuator to
its mechanical zero position.
Position indication: Mechanical Rotary angle position given by the position indicator.
Position indication: Electronic -
Connecting the
feedback potentiometer
to an external voltage
source results in voltage
supply proportional to
the rotary angle.
Position indicator:
Output voltage U =
DC 0...10 V is
generated
proportional to the
rotary angle.
By Modbus register
value
Self-adaptation of rotary angle
range -
When self-adaption is
active, the actuator
automatically detects
mechanical end of the
rotary angle range.
Auxiliary switch
The switching points for auxiliary switches
A and B can be set independent of
each other
in increments of 5° within 5° to 90°.
-
Powerpack (two actuators, tandem-
mounted)
Mounting two actuators of the same type on the
same damper shaft doubles the torque. Not permissible
Response on damper blocking The actuator is equipped with an automatic switch-off mechanism.
Manual adjustment
∂
When no voltage is applied, you can turn the actuator to any rotary angle position (using a hex
wrench) and lock by using a screwdriver, or the adjustment tool.
∂The actuator returns to the zero position on mechanical unlocking by means of a hex wrench (turn in
"90°" – open" direction) or by shortly supplying operating voltage.
Rotary angle limitation The rotary angle range can be limited mechanically
by inserting the shaft adapter in 5° increments.

9/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
2.3.1 Function description supplement for GMA16..1
The following information applies to the standard and enhanced versions of the
modulating actuators.
Offset Uo and span ΧU can be adjusted using two potentiometers (see 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 0…35 V.
2.3.2 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 Control type Controller output
GMA12..1 Two-position AC 24 V or DC 24…48 V
GMA32..1 Two-position AC 230 V
GMA13..1 Three-position AC 24 V or DC 24…48 V
GMA16..1 Modulating DC 0...10 V / DC 0...35 V
GMA161.1E/MO Modbus RTU Modbus RTU
Characteristic function
GMA163.1, GMA164.1
Application
Process values and
parameters
GMA161.1E/MO
Self-adaption of the
rotary angle range
GMA161.1E/MO

10/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
2.5 Structure and design
The GMA...1 electronic actuators are available for two-position, three-position,
modulating and networked control with spring return. The nominal torque is 7 Nm. The
actuator's connection cables are prewired.
Robust, light-weight full metal housing from aluminum diecast. The housing guarantees
a long actuator life even under harsh environmental conditions.
Maintenance-free and noise-free gear train with stall and overload protection for the life
of the actuator.
The spring preload of 5° ensures safe closure of the air dampers following correct
mounting.
You can manually adjust the actuator using a hex wrench and lock it using a
screwdriver.
This mounting type allows for fastening the actuator to shafts with various diameters
and in various shapes (square, round) using just one screw.
Insert the shaft adapter from either side into the opening for the shaft adapter.
For short shafts, the shaft adapter is on the duct side.
The shaft adapter coupling and the adapter holding are coupled by means of double-
sided gearing.
A bolted metal strip is used for attaching the actuator.
All actuators have pre-wired, 0.9 m long (standard length) connection cables.
The actuators can be delivered as a type-specific variant having the following elements:
For supplementary functions, the auxiliary switches A and B can be adjusted on either
side.
Both potentiometers for the operating functions Uo and ΧU are accessible on either
side.
The potentiometer is integrated and can be connected by means of a cable.
The HMI of networked types consists of a push button and an LED to allow certain
interactions with the actuator or to provide visible feedback from the actuator.
Description
Housing
Gear train
Spring preload
Manual adjustment
Self-centering shaft
adapter
Mounting bracket
Electrical connection
Type-specific elements
Auxiliary switch
Potentiometer for offset
and span
Feedback potentiomet
er to
position indication
Push button and LED
at external Interface

11/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
2.6 Setting and operator elements
-5°
90°
15
6
5
4
3
2
112
11
8
7
16
4614Z01
9
10
Legend
1 Housing
2 Rotary angle scale
3 Potentiometer to adjust the span ΧU
4 Potentiometer to set the offset Uo
5 Mounting bracket
6 Connecting cable for power and
positioning signal
7 Connecting c able for auxiliary
switches or feedback potentiometer
8 Locking shaft for gear train
9 Keyhole for manual adjustment
10 Setting shafts for auxiliary switches
A and B
11 Position indicator
12 Self-centering shaft adapter
13 Locking ring for shaft adapter
14 Adapter for position indicator
15 Turnkey for manual adjustment (9)
16 Adjustment tool for auxiliary
switches (10), potentiometer (3, 4),
and locking shaft (8)
Rotary direction, dependent on mounting
position
For long damper shafts For short damper shafts
12
4614Z12
13
4614Z13
11
90°
45°
5°
14
12
13
4614Z14
4614Z15
11
90°
4
5°
Actuator
Arrangement of shaft
adapter

12/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
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.
Gear train rotary 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 rotary range
(without rotary angle limitation)
①Gear train presetting
(factory setting)
Pointer
Rotary angle scale
Rotary angle limitation
Adapter setting
Example: x = 7
x = number of steps (5°)
②incl. gear train presetting
Introduction
Motor technology
Spring return
Mechanical functions

13/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
3.3 Auxiliary switches and positioning signals
The illustration below shows the relationship between the rotary angle, the adjustable
switching points for auxiliary switches A and B, and the positioning signal.
Gear train rotary range
Inner mechanical limits
S1 S1 S4 S4
S2 S3 S2 S3 S5 S6 S5 S6
(Q12) (Q14) (Q14) (Q12) (Q22) (Q24) (Q22) (Q24)
(Q11) (Q11) (Q21) (Q21)
0°
0°
0°
A B
85°
5° ⇑1 x click
95°
95°
0° 95°
5°
4614D11
1
2
3
4
5
6
7
8
9
10
95°
50
40
30
20
10
50
60
70
80
90
A
B
4614Z03en
Aux Switch
Adjustment
[ ° ]
Auxiliary switches
Factory setting:
A = 5°; B = 85°
Setting range 5°…90°
Switching states
Rotary movement as a function
of the positioning signal
Modulating signal, DC 0…10 V
AC 24 V/DC 24…48 V
•no movement (G,G0,Y=U)
‚opening (G,G0,Y>U)
ƒclosing (G,G0,Y<U or G,G0)
„Spring return function
(no voltage)
Tree-position signal
AC 24 V/DC 24…48 V
…no movement (G,G0)
†opening (G,G0,Y1)
‡closing (G,G0,Y2
or G,G0,Y1,Y2)
ˆSpring return function
(no voltage)
Two-position signal
AC 24 V/DC 24…48 V;
AC 230 V
‰opening (G,G0 or L,N)
ŠSpring return function
(no voltage)
The setting shafts for the auxiliary switches turn together with the adapter. The scales
thus only refer to the inner mechanical 0° limit.
The adjustment tool is used to set the auxiliary switches; it is part of the delivery (type-
specific).
Electrical functions
Note
Adjustment tool

14/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
3.4 Adjustable characteristic function
A modulating positioning signal DC 0..35 V from a controller controls the actuator.
The rotary angle is proportional to the positioning signal. Using potentiometer "Uo", you
can set the offset for DC 0...5 V, and with potentiometer "ΧU", you can set the span for
DC 2...30 V.
100
0
UO
Ys [%]
4637D04
2 5 10 35
2)
1)
ΧU (max. 30 V)
4)
30 Y [V]
3)
Ys Positioning range: 100 % = Rotary angle 95°
YPositioning signal
Uo Offset
ΧU Span (for Ys = 100 %)
2
4
01
3
5Uo
30
2
16
10
24
U
Uo U
Ys
U
4614Z02
Example Positioning
signal Y Positioning range Ys Settings
Uo ΧU
1) DC 0...2 V 0...100 % DC 0 V DC 2 V
2) DC 5...10 V
DC 5...35 V
0...17 %
0...100 % DC 5 V DC 30 V
3) DC 0...10 V
DC 0...30 V
0...33 %
0...100 % DC 0 V DC 30 V
4)* DC 0...10 V 0...100 % DC 0 V DC 10 V
* Characteristic curve for factory setting
∂The Y input is limited to max. DC 35 V.
∂The adjustable span ΧU is max. 30 V.
Define the adjustable span ΧU if the actuator is to open from 0...50 % at a positioning
signal of Y = DC 2…10 V. The offset Uo thus amounts to 2 V. The rotary angle is 90°.
Calculating the setting value for ΧU:
Ζ
∴
Ζ∴ Ζ∴ Ζ∴
∋ ( ∋ ( V16V2V10
%50
%100
VUoV10
%YsSpan
%maxYsrangepos.max.
UΔ<,√<,√<
Uo = 2 V, ΧU = 16 V
Actuators
GMA163.1, GMA164.1,
Examples as per the
diagram
Note
Example
Formula
Potentiometer settings

15/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
100
0
ΧU (16 V)
Y [V]
YS[%]
4637D02
21810
Umin Umax
50
Uo
Max. positioning range Ysmax = 100 % (95°)
Span Ys = 50 % (47.5°)
Offset Uo = 2 V
Span ΧU = 16 V
Effective span
ΧUw = Umax – Umin
= 10 V - 2 V = 8 V
3.5 Neutral zone
For modulating control actuators, note the control characteristic for the selected switch-
on point of the setpoint.
The diagram shows the setting characteristics by including the neutral zone. The values
for the neutral zone listed in the diagram apply to DC 0...10 V (without characteristic
function).
-E
E
+E
Rotary direction
Hysteresis
H = 70 mV
Neutral zone NZ = 200 mV
Hysteresis
H = 70 mV
Counter- clockwise
Clockwise
90° ⇓0°
0° ⇓90°
4614D03en
The diagram shows the relationship between the differential voltage E = Y – U
(difference between setpoint Y and actual value U) and the rotary direction, including
hysteresis and neutral zone.
For DC 0...35 V (with characteristic function) the following values apply:
Neutral zone NZ = 2 % of span ΧU.
Hysteresis H = 0.7 % of span ΧU.
Characteristic function for
the above example
Actuators
GMA161.1, 166.1
(DC 0...10 V)
Actuators
GMA163.1, 164.1
(DC 0...35 V)

16/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
4 Engineering notes
Carefully study the basics of the control systems used before proceeding to the
sections below, and pay special attention to all safety-related information.
Use these actuators in a system only for applications as described in the basic system
documentation of the control systems used. Additionally, note the actuator-specific
properties and conditions as described in this chapter and in chapter 8 "Technical data"
in this document.
4.1 Safety notes
This chapter explains general and system-specific regulations for mains and operating
voltages. It also contains important information regarding your own safety and that of
your plant.
The warning triangle to the left means that you must observe all respectively listed
regulations and notes. If ignored, injuries and equipment damages may result.
Observe the following general regulations during engineering and project execution:
∂Electric and high-power regulations of the respective country.
∂Other mandatory country regulations.
∂House installation regulations of the respective country.
∂Regulations by the energy supplier.
∂Diagrams, cable lists, dispositions, specifications and instructions as per the
customer or the engineering business.
∂Third-party regulations from, e.g., the general contractors or building contractors.
Electrical safety in Landis & Staefa building automation and control systems primarily
depends on extra-low voltage with safe isolation from mains voltage.
Depending on the earthing of extra-low voltage, SELV or PELV applications as per
HD384 "Electrical plants in buildings" result:
Unearthed = Safety Extra-Low Voltage SELV
Grounded = Protection by Extra-Low Voltage PELV
Observe the following for grounding G0:
∂As a rule, earthing as well as non-earthing of G0 is permissible for AC 24 V/
DC 24…48 V operating voltage. However, observe all local regulations and
customary procedures.
∂For functional reasons, earthing may be required or not permissible.
∂Earth all AC 24 V and DC 24…48 V systems unless otherwise specified by the
respective manufacturers.
∂To avoid earth loops, connect systems with PELV to the earth at only one end in
the system, normally at the transformer, unless otherwise specified.
Introduction
Intended use
Please observe the
following notes
Safety note
General regulations
Safety
SELV, PELV
Earthing of
G0 (system neutral)
Recommendation on
earthing G0

17/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
The following regulations apply to these operating voltages:
Regulation
Operating voltage
∂AC 24 V
∂DC 24…48 V
The operating voltage must comply with the
requirements for SELV or PELV:
∂Permissible deviation of AC 24 V nominal
voltage at the actuators: +/– 20 %.
∂Permissible deviation of DC 24…48 V nominal
voltage at the actuators: +/– 20 %
Operating voltage
AC 230 V
Permissible deviation of AC 230 V nominal voltage
at the actuators: +/-10 %.
Specification on AC 24 V
transformers
Safety transformers as per EN 61558, with double
isolation, designed for 100 % runtime to supply
SELV or PELV circuits.
Determine the transformer’s power consumption by
adding up the power consumption in VA for all
actuators used.
The capacity used from the transformer should
amount to at least 50 % of the nominal load for
efficiency reasons (power efficiency).
The nominal capacity of the transformer must be at
least 25 VA. For smaller transformers, the ratio
between voltage at idle time to voltage at full load is
unsatisfactory (> + 20 %).
Specifications for
DC 24…48 V supply
Determine the supply by adding up the power
consumption in W for all actuators used.
Fuse of AC 24 V/DC 24…48 V
operating voltage
Transformers, secondary side or DC supply:
∂According to the effective load of all connected
devices.
∂Line G (system potential) must always be fused.
∂Where required, additional line G0 (system
neutral).
Fuse of AC 230 V mains voltage Transformers, primary side as per the applicable
installation regulations of the respective country.
4.2 Device-specific regulations
Safety for the devices is ensured by (among other aspects):
∂Supply of AC 24 V/DC 24…48 V extra-low voltage as per SELV or PELV.
∂Double isolation between AC 230 V mains voltage and SELV/PELV circuits.
∂Two-position and three-position actuators GMA32..1, GMA12..1, and GMA13..1:
Mount max. two actuators on the same damper shaft.
∂Use the mounting bracket to secure the second actuator also (see accessories in
chapter 2.2).
∂Do not mechanically connect modulating GMA16..1 actuators.
Operating voltage
AC 24 V,
DC 24…48 V,
AC 230 V
Device safety
Mechanical parallel
connection of actuators

18/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
Apply only mains voltage or only safety extra-low voltage to the switching outputs of
auxiliary switches A and B. Mixed operation is not permissible. However, operation
using various phases is not permissible.
Include the potentiometer's electric data to indicate the damper position via external
switching.
Up to 10 actuators of the same device type can be electrical parallel wired. Cable
length and cable cross section have to be respected.
See chapter 6 “wiring notes” for more information.
Do not open the actuator!
The device is maintenance-free. Only the manufacturer may conduct any repair work.
4.3 Notes on EMC optimization
Make sure to separate high-interference cables from equipment susceptible to
interference.
∂Cables emitting interference: Motor cables, particularly motors supplied by
variable speed drives, energy cable
∂Cables susceptible to interference: Control cables, extra-low voltage cables,
interface cables, LAN cables, digital and
analogue signal cables
∂Both cable types can be routed in the same cable ducting, but in different
compartments.
∂If ducting with three closed sides and a partition is not available, separate the
interference-emitting cables from other cables by a minimum of 150 mm or route in
separate ducting.
∂Cross high-interference cables with equipment susceptible to interference only at
right angles.
∂When, as an exception, signal and interference-emitting supply cables are run in
parallel, the risk of interference is very high. In this case, limit the cable length of the
positioning signal line DC 0...10 V for modulating actuators.
We recommend to use unscreened cables. When selecting unscreened cables, follow
the manufacturer's installation recommendations. In general, unshielded twisted-pair
cables have sufficient EMC characteristics for building services (incl. data applications)
as well as the advantage that no provision is required for coupling to the surrounding
earth.
4.4 Determining the actuator
After obtaining the damper torque rating [Nm/m2] from the manufacturer and
determining the damper area, calculate the total torque required to move the damper as
follows:
Total torque [Nm]= Torque rating [Nm/m2]× damper area [m2].
Instead of the torque rating, the total torque can also be determined from the
manufacturer's sizing diagrams.
Auxiliary switches A, B
Feedback
potentiometer for
position indication
Electrical parallel
connection of actuators
Caution
Maintenance
Running cables in a duct
Cable types
Cable segregation
Unshielded cables
Required actuator
torque

19/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
The following diagram (example EMCO) allows for determining the total torque for this
air damper type.
10
9
8
7
6
5
4
3
2
1
0
200 400 600 800 1000 1200 1400 1600 1800 2000
1995
1665
345
20 1600
1200
800
15
400
15105
105
2010
10
2
000
1
0
00
0
1005
1335
675
Damperhe
i
ghtH
[ mm]
Friction torque (without air influence) [Nm]
Damper width B [mm]
Total torque [Nm]
Damper width B [mm]
4614D02en
Totalpressure[P]
Damper for blinds:
Width = 800 mm
Height = 1005 mm
Total pressure = 1000 Pa
The total torque of about 5 Nm results from the diagram.
Determine your type of actuator from the table below:
If
Ζ
∴
1
SF
NmtorqueTotal then use type
(with spring return)
′7 Nm GMA..1 (7Nm)
′14 Nm 2 x GMA..1 (2 x 7 Nm) 2or
′18 Nm GCA..1 (18 Nm) 3
′36 Nm 2 x GCA..1 (2 x 18 Nm) 4
1Safety Factor SF:
When calculating the number of actuators, remember to include non-definable
variables such as slight misalignment, damper age, etc. as a safety factor.
We recommend a total safety factor of 0.8.
Apply the same factor when calculating the actuator torque by the torque rating.
If the required actuator torque is greater than 7 Nm, the following can be used:
2Two actuators (tandem-mounted "powerpack") of type series GMA12..1, GMA32..1,
GMA13..1
3one actuator of type series GCA...1.
4If the actuator torque is greater than 18 Nm, two actuators of type series GCA...1 can
mechanically be connected and mounted on the damper shaft.
Sizing diagram
Example
Determining the actuator
type
Notes

20/44
Siem ens GMA..1 actuators with spring return CM2Z4614en
Building Technologies 2018-01-11
5 Mounting notes
All information and steps to properly prepare and mount the actuator are available in
the mounting instructions 4 319 0108 0 (M4614) delivered with the actuator. The shaft
adapter as well as all other individual parts are not pre-mounted, as the actuator
components are put together differently depending on either clockwise or counter-
clockwise rotation of the damper shaft and damper shaft length. Refer to 2.5 "Structure
and design" in this chapter.
Choose the actuator's mounting position so that you can easily access the cables as
well as the setting dials on the front of the actuator. Refer to 11.1 "Dimensions".
∂GMA12..1, 32..1, 13..1, 16..1: For mounting, turn the actuator by 180° depending on
the necessary rotary direction. All setting and operator elements are available on
both sides of the actuator, depending on clockwise or counter-clockwise rotation.
To satisfy the IP54 protection class requirements, the following conditions must be
fulfilled:
∂The actuators are equipped only for vertical mounting (cable entries at bottom) with
air dampers having a horizontal shaft.
∂The actuator mounted on the damper shaft may be mounted by max. +/- 45° to the
vertical line:
∂Use the weather protection cover ASK75.3 for any mounting position.
The mounting bracket (see dimensions) is required for mounting on the damper shaft.
The insertion depth for the bolt into the housing must be sufficient and guaranteed.
The actuator comes with a factory-set spring preload of 5° which ensures a tight close-
off for the air dampers.
Manual adjustment of the shaft adapter via hex wrench and gear train locking as per
the mounting instructions.
To ensure a tight close-off function for the dampers and the exact switching position for
switches A and B, the actuator can only be adjusted with a mounted shaft adapter
and position indicator in accordance with the mounting instructions.
If necessary, you can limit the rotary angle at increments of 5° for the entire span by
positioning the shaft adapter in the respective position.
Refer to chapter 8 "Technical data" for information on minimum length and diameter of
the damper shafts.
Mount the mounting sets for converting a rotary movement to linear movement (chapter
2.2 "Type summary") as per the separate mounting instructions.
When mounting two actuators on the same damper shaft (for GMA12..1, 32..1, 13..1,)
use the ASK73.3 mounting bracket.
Mounting instructions
Mounting position
Mounting position in
dependence of rotary
direction
Device protection
Mounting bracket
Spring preload
Manual adjustment
Mechanical limitation of
rotary angle
Damper shafts
Use of rotary/linear sets
Tandem (Powerpack)
mounting