Dimensioning Of Braking Resistors - Siemens SIMOTICS T-1FW3 Configuration Manual

Configuration
5.3 Braking resistors (armature short-circuit braking)
5.3.2

Dimensioning of braking resistors

The correct dimensioning ensures an optimum braking time. The braking torques which are
obtained are also listed in the tables. The data applies for braking from the rated speed. If
the motor brakes from another speed, then the braking time cannot be linearly reduced.
However, longer braking times cannot occur if the speed at the start of braking is less than
the rated speed.
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 taken into account here.
Higher currents and torques can occur than those calculated as a result of the saturation.
The ratings of the resistors must match the particular I
Dynamic braking
Table 5- 2 Dynamic braking 1FW3, SH 150 Standard
Motor type External
braking
resistor
R
Standard
1FW3150-1☐H
1FW3150-1☐L
1FW3150-1☐P
1FW3152-1☐H
1FW3152-1☐L
1FW3152-1☐P
1FW3154-1☐H
1FW3154-1☐L
1FW3154-1☐P
1FW3155-1☐H
1FW3155-1☐L
1FW3155-1☐P
1FW3156-1☐H
1FW3156-1☐L
1FW3156-1☐P
106
Average braking torque
M
br av
without external
[Ω]
braking resistor
opt
11 21.5
8.3 17.8
5.5 14.8
5.0 46.5
3.7 37.5
2.4 32.0
3.3 73
2.4 60
1.6 50
2.3 97
1.7 77
1.1 66
2.0 119
1.4 96
0.97 84
Max.
[Nm] braking torque
M
br max
with external
braking resistor
32.5 40.5
34.5 42.5
35.5 44.0
75 93
80 99
85 105
122 151
130 161
137 170
164 205
173 215
188 235
205 255
215 270
240 295
Configuration Manual, 08/2020, A5E46027705B AA
t load capability.
2
rms braking current
I
br rms
[Nm]
without external
braking resistor
5.3
8.6
13.5
12.2
20.0
32.0
19.3
32.0
51.0
27.0
43.5
71
32.5
54
85
1FW3 complete torque motors
[A]
with external
braking resistor
4.75
7.7
12.1
11.0
17.9
28.5
17.3
28.5
45.0
24.0
39.0
64.0
29.5
48.0
76.0