Siemens SIDOOR AT40 System Manual page 87

Geared motors
5.2 Installation
3. Pass the toothed belt over the deflector pulley and drive pinion. Place both open ends of
the toothed belt in the door clutch holder. Screw the door clutch holder together.
4. Tension the toothed belt with the aid of the tensioning device.
Check the belt tension by pressing the toothed belt inwards in the center.
You will recognize the correct belt tension by how far the belt is pressed in (B). The depth
(B) the belt is pressed in depends on the distance between the drive pinion and deflector
pulley (A).
The following depths of the pressed-in belt (B) apply as a function of the distance
between the drive pinion and deflector pulley (A).
86
A (cm) 50
B (cm) 1.5
100 150
3 4.5
Door control units SIDOOR AT40 and ATD400V for elevators
System Manual, 06/2018, A5E42192709-AC
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