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Notes On Emc Optimization; Determining The Actuator - Siemens OpenAir GMA 1 Series Technical Basics

Actuators with spring return
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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
18/44
Siemens
Building Technologies
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:
∂ Cables susceptible to interference: Control cables, extra-low voltage 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/m
determining the damper area, calculate the total torque required to move the damper as
follows:
Nm
= Torque rating [Nm/m
[
]
Total torque
Instead of the torque rating, the total torque can also be determined from the
manufacturer's sizing diagrams.
GMA..1 actuators with spring return
Motor cables, particularly motors supplied by
variable speed drives, energy cable
interface cables, LAN cables, digital and
analogue signal cables
2
] from the manufacturer and
2
2
× damper area [m
]
].
CM2Z4614en
2018-01-11

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