Siemens SIDOOR AT40 System Manual page 105

Span tension
The span tension T of the belt is calculated as follows:
T: Span tension [N]
k: Meter weight [kg/m]
L: Belt length [m]
f: Frequency [Hz]
The following table shows the natural frequency (f) of the belt for the recommended span
tension (T) at different belt lengths (L).
Belt system
Article number
Recommended span ten‐
sion (T)
Meter weight (k)
Belt length (L)
0.3 m
0.5 m
1.0 m
1.5 m
2.0 m
2.5 m
3.0 m
3.5 m
4.0 m
4.5 m
5.0 m
In some applications it may be sufficient to set the belt tension as follows:
AT40 and ATD400V for elevators
System Manual, 06/2022, A5E42192709-AH
Conti SYNCHROLINE STS-S8M,
12 mm
6FB1104-0AT01-0AB0
6FB1104-0AT02-0AB0
160 N ±10 N
0.062 kg/m
Frequency (f)
84.7 Hz
50.8 Hz
25.4 Hz
16.9 Hz
12.7 Hz
10.2 Hz
8.5 Hz
7.2 Hz
6.3 Hz
5.6 Hz
5.0 Hz
Conti SYNCHROLINE STS-S8M,
14 mm
6FB1104-0AT03-0AB0
6FB1104-0AT04-0AB0
160 N ±10 N
0.072 kg/m
Frequency (f)
78.6 Hz
47.1 Hz
23.5 Hz
15.7 Hz
11.8 Hz
9.4 Hz
7.9 Hz
6.7 Hz
5.9 Hz
5.2 Hz
4.7 Hz
A
B
Geared motors
6.2 Installation
103