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1.6
Armature short-circuit braking
Definition as described in the Configuration Manual "General Section".
Dimensioning the braking resistors for optimum short-circuit braking
The correct dimensioning ensures an optimum braking time. The braking torques which are
obtained are also listed in the tables. Data apply for braking from the rated speed and
moment of inertia J
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
Configuration Manual "General Section for Synchronous Motors".
Non-ventilated
Table 1-3
Resistor braking for the 1FT6 series, shaft heights 28 to 48, non-ventilated
Motor type
Braking
resistor
external
R
opt
SH 28, SH 36, SH 48, non-ventilated
1FT6021-6AK7⃞
1FT6024-6AK7⃞
1FT6031-4AK7⃞
1FT6034-4AK7⃞
1FT6041-4AF7⃞
1FT6041-4AK7⃞
1FT6044-4AF7⃞
1FT6044-4AK7⃞
1FT6 synchronous motors
Configuration Manual, (PFT6), Edition 12.2004, 6SN1197-0AD12-0BP0
= J
. If the motor brakes from another speed, then the braking
external
mot
Average braking torque
M
[Nm]
br rms
without
[Ω]
external
braking resistor
braking resistor
–
1.1
–
2.7
4.4
2.1
3.7
3.6
0.31
6.7
2.6
5.8
2.0
13
1.8
10
t load capability, refer to the
2
Max.
braking torque
M
[Nm]
br max
with
external
–
1.6
–
3.7
2.3
2.8
4.4
5.5
6.8
8.4
6.8
8.4
14
17
14
17
Motor Description
1.6 Armature short-circuit braking
rms braking current
I
[A]
br rms
without
with
external
external
braking resistor
braking resistor
6.8
8.3
6.9
13
10
18
18
37
–
–
6.4
12
10
17
17
33
1-15
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