Dimensioning Of Braking Resistors - Siemens SIMOTICS S-1FK2 Configuration Manual
Synchronous motors for sinamics s120
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Also See for SIMOTICS S-1FK2:
- Configuration manual (122 pages) ,
- Operating instructions manual (118 pages) ,
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Configuration
5.4 Brake resistances (armature short-circuit braking)
5.4.3
Dimensioning of braking resistors
The correct dimensioning ensures an optimum braking time. The braking torques obtained are
also listed in the tables. The data applies to braking operations from the rated speed and
moment of inertia J
If the motor brakes from another speed, then the braking time cannot be linearly reduced.
In this case, calculate the braking time according to the formula in the section "Dimensioning of
the construction of braking resistors (Page 75)".
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 tables is calculated for rated values according to the data sheet. The
variance during production as well as iron saturation have not been taken into account here.
Higher currents and torques than those calculated can occur as a result of the saturation.
Risk of fire caused by continuous overload
If the external braking resistor is continuously overloaded, for example as the result of a
defective braking chopper, this can cause an explosion or fire - resulting in death or severe
injury and/or could cause the housing to melt.
• Use only braking resistors that are intrinsically safe.
Table 5-2
Dynamic braking for 1FK2
Motor type
Braking re‐
sistor, exter‐
nal
R
opt
1FK2103-2AH
1FK2103-4AH
1FK2104-4AF
1FK2104-4AK
1FK2104-5AF
1FK2104-5AK
1FK2104-6AF
1FK2105-4AF
1FK2105-6AF
1FK2106-3AF
1FK2106-4AF
1FK2106-6AF
1FK2203-2AK
1FK2203-4AK
1FK2204-5AF
78
= J
external
WARNING
Average braking torque
Without exter‐
nal
Braking resis‐
tor
/ Ω
M
/ Nm
br rms
15
0.47
10
0.9
21
0.75
5
0.7
12.5
1.35
2.8
1.35
8.5
1.75
6.5
1.7
5
2.7
5
2.6
3.4
3.2
3.1
4.7
12.5
0.75
7
1.4
6
2.4
.
Mot
Maximum
braking tor‐
With external
que
braking resistor
M
(R
) / Nm
M
br rms
opt
br max
0.6
1.2
1.1
1.1
2.3
2.3
3.1
4
6.5
6.5
9
13.5
1
2
3.3
rms braking current
Without exter‐
nal
Braking resis‐
/ Nm
tor
I
/ A
br rms
0.75
2.1
1.5
3.9
1.35
2.2
1.35
4.6
2.9
4.3
2.8
9
3.8
6
5
8.5
8
12
8.5
15
11
18.5
16.5
26
1.25
3.6
2.5
7
4.1
7
1FK2 Synchronous Motors for SINAMICS S120
Configuration Manual, 02/2022, A5E46927724B AD
With external
Braking resis‐
tor
I
(R
) / A
br rms
opt
1.9
3.5
2
4.1
3.9
8
5.5
7.5
11
13.5
16.5
24
3.3
6.5
6
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