Configuration
5.4 Braking resistor (armature short-circuit braking)
1FT2 synchronous motors for SINAMICS S120
Configuration Manual, 03/2021, A5E50645584B AA
69
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 67)".
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 fire 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 fire - resulting in death or severe
injury and/or could cause the housing to melt.
•
Use only braking resistors that are intrinsically safe.
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