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Configuration
5.4 Brake resistances (armature short-circuit braking)
5.4.2
Dimensioning of braking resistors
Correct dimensioning of the braking resistors determines the optimum braking time.
The braking torques that are obtained are listed in the tables. The data applies for braking
from the rated speed and moment of inertia J
If you brake the drive from another speed, the braking time cannot simply be reduced
proportionally.
In this case, calculate the braking time using the formula provided in Chapter "Description of
function braking resistor (Page 120)".
If the speed at the start of braking is less than the rated speed, the braking times will be
shorter or remain the same.
The data in the following table is calculated for rated values according to the data sheet. The
variance during production as well as iron saturation have not been considered. Due to
saturation, currents and torques can be higher than calculated.
1FT7 Compact, natural cooling
Table 5- 3
Armature short-circuit braking with/without external braking resistors
Motor type
External brak-
ing resistor
1FT7034-☐AK7
1FT7036-☐AF7
1FT7042-☐AF7
1FT7042-☐AK7
1FT7044-☐AF7
1FT7044-☐AK7
1FT7046-☐AF7
1FT7046-☐AH7
1FT7062-☐AF7
1FT7062-☐AK7
1FT7064-☐AF7
1FT7064-☐AK7
1FT7066-☐AF7
1FT7066-☐AH7
1FT7068-☐AF7
1FT7082-☐AC7
1FT7082-☐AF7
1FT7082-☐AH7
1FT7084-☐AC7
1FT7084-☐AF7
124
Average braking torque
R
/ Ω
opt
Without external
braking resistor
6.7
2
4.2
3
6.6
3
5.0
2
4.8
7
3.3
5
3.6
10
1.6
8
10.4
2
5.0
1
7.0
3
6.1
2
3.8
4
2.5
3
4.5
6
9.6
4
6.7
3
3.9
2
3.9
7
4.4
5
= J
external
M
/
Max. braking
Br rms
Nm
torque
With external
braking resis-
tor
3
5
4
4
10
10
14
14
4
4
7
7
11
10
15
9
9
9
16
16
Configuration Manual, 09/2018, A5E45099423B AA
.
Mot
rms braking current I
M
/
Br max
Nm
Without exter-
nal braking
resistor
4
9
6
15
5
7
6
14
12
13
12
25
17
18
17
36
5
7
5
15
9
11
9
17
13
18
13
27
18
20
11
8
11
13
11
21
20
18
20
21
S-1FT7 synchronous motors
[A]
br rms
With external
braking resis-
tor
8
14
7
12
12
22
17
32
6
13
10
15
16
24
18
8
11
19
16
19
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