5 How the ASSA ABLOY SW300 and ASSA ABLOY SW150 work
The swing door operators ASSA ABLOY SW300 and ASSA ABLOY SW150 use a DC motor which is
connected to the output shaft by a combination of a worm gear and spur gears. The push- or pull
arm system that is connected to the output shaft opens the door in a surface mounted application.
There are two versions of the operator:
• ASSA ABLOY SW300 for fire door installations which will have an adjustable mechanical spring.
• ASSA ABLOY SW150 without the mechanical spring that is possible to use for non-fire door in-
stallations. No extension units are installed in this version.
In ASSA ABLOY SW300, there is an adjustable spring mechanism, consisting of a helical compression
spring combined with a linkage system including a pressure roller that acts on a cam curve that is
attached to the output shaft. During opening of the door, the compression spring is tensioned by
the rotation of the output shaft. During the closing cycle, the accumulated spring force is transferred
to the output shaft by means of the cam curve and the pressure roller. The transferred spring force
is acting in the closing direction.
The spring force can be adjusted so that there is appropriate force to close the door when it is
manually operated or if there is a power failure.
It is possible to increase the closing force by using the motor in combination with the spring and
thereby increase the door closing force (powered close).
The mechanism consist of:
ASSA ABLOY SW300ASSA ABLOY SW150
Motor1
Worm gear2
Two spur gears3
Output shaft4
Helical compression spring (only fire rated version)5
Spring mechanism that transfer the spring force to the output shaft (only fire rated version)6
Cam to optimise the torque on the output shaft (only fire rated version)7
Mechanical door stop on the output shaft (adjustable)8
Shaft for a mechanical coordinator (only fire rated version)9
Encoder10
Micro switch11
1007913-en-20.0Issue 2021-02-0414
5 How the ASSA ABLOY SW300 and ASSA ABLOY SW150 work
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