Siemens SIMOTICS S 1FK2104-4AF User Manual

Configuration
5.4 Braking resistor (armature short-circuit braking)
1FK2 synchronous motors for SINAMICS S120
Configuration Manual, 06/2019, A5E46927724B AB
61
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
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
Ext
= 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 60)".
If the speed at the start of braking is less than the rated speed, the braking times will be
shorter or remain the same.

Siemens SIMOTICS S 1FK2104-4AF Specifications

General

Brand	Siemens
Model	SIMOTICS S 1FK2104-4AF
Category	Servo Drives
Language	English