Configuration
5.4 Braking resistor (armature short-circuit braking)
1FT2 synchronous motors for SINAMICS S120
68
Configuration Manual, 03/2021, A5E50645584B AA
Calculating the braking time
The values for calculation are provided in Chapter "Data sheets and characteristics (Page 78)".
Braking time
t
B
=
J
Tot
• n
/ 9.55 •
M
Br
t
B
/ s = braking time
n
/ r/min = operating speed
M
Br
/ Nm = average braking torque
Moment of inertia
J
Tot
=
J
Mot
+
J
Ext
J
Tot
/ kgm
2
= moment of inertia
J
Mot
/ kgm
2
= motor moment of inertia
J
Ext
/ kgm
2
= external moment of inertia
Note
In determining the run-on distance, consider the friction of the mechanical transmission
elements (included in the calculation as an allowance in M
B
) and the switching delay times of
the contactors.
To avoid mechanical damage to the drive, mount mechanical stops at the end of the absolute
traversing range of the machine axes.
Armature short-circuit braking
with external braking resistor
without external braking resistor
M
Br
= braking torque
I
Br rms
= rms braking current
M
Br rms
= average braking torque
t
R
= run-out time
M
Br opt
= optimum braking torque
n = speed
I
Br
= braking current
n
N
= rated speed
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