Basic Documentation

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Siemens Rotary actuators with spring return GCA…1 CE1Z4613en
Building Technologies Engineering notes 2017-05-26
The following chart (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
1
9
9
5
1
6
6
5
3
4 5
20
1600
1200
800
15
400
15105
105
2010
10
2
0
0
0
1
0
0
0
0
1
0
0
5
1
3
3
5
6
7
5
D
a m
p
e
r
h e
i
g
h t
H
[ m
m
]
Friction torque (without air influence) [Nm]
Damper width B [mm]
Total torque [Nm]
Damper width B [mm]
4614D02en
T
o
t
a
l
p
r
e
s
s
u
r
e
[
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)
2
or
′ 18 Nm GCA...1 (18 Nm)
3
′ 36 Nm 2 x GCA...1 (2 x 18 Nm)
4
1
Safety Factor SF:
When calculating the number of actuators, remember to include nondefinable
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:
2
Two actuators (tandem-mounted "powerpack") of type series GMA12..1, GMA32..1,
GMA13..1
3
one actuator of type series GCA...1.
4
If 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.
(refer to chapter 5 “Mounting notes“, powerpack mounting)
Sizing chart
Example
Determining the
actuator type
Notes