Siemens SIMOTICS S-1FK2 Configuration Manual

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
external
= J
Mot
.
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.
WARNING
Risk of 󹪝re 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 󹪝re - 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
/ Ω
Average braking torque Maximum
braking tor‐
que
M
br max
/ Nm
rms braking current
Without exter‐
nal
Braking resis‐
tor
M
br rms
/ Nm
With external
braking resistor
M
br rms
(R
opt
) / Nm
Without exter‐
nal
Braking resis‐
tor
I
br rms
/ A
With external
Braking resis‐
tor
I
br rms
(R
opt
) / A
1FK2103-2AH 15 0.47 0.6 0.75 2.1 1.9
1FK2103-4AH 10 0.9 1.2 1.5 3.9 3.5
1FK2104-4AF 21 0.75 1.1 1.35 2.2 2
1FK2104-4AK 5 0.7 1.1 1.35 4.6 4.1
1FK2104-5AF 12.5 1.35 2.3 2.9 4.3 3.9
1FK2104-5AK 2.8 1.35 2.3 2.8 9 8
1FK2104-6AF 8.5 1.75 3.1 3.8 6 5.5
1FK2105-4AF 6.5 1.7 4 5 8.5 7.5
1FK2105-6AF 5 2.7 6.5 8 12 11
1FK2106-3AF 5 2.6 6.5 8.5 15 13.5
1FK2106-4AF 3.4 3.2 9 11 18.5 16.5
1FK2106-6AF 3.1 4.7 13.5 16.5 26 24
1FK2203-2AK 12.5 0.75 1 1.25 3.6 3.3
1FK2203-4AK 7 1.4 2 2.5 7 6.5
1FK2204-5AF 6 2.4 3.3 4.1 7 6
Con󹪝guration
5.4 Brake resistances (armature short-circuit braking)
1FK2 Synchronous Motors for SINAMICS S120
78 Con󹪝guration Manual, 02/2022, A5E46927724B AD

Siemens SIMOTICS S-1FK2 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FK2
Category	Engine
Language	English