GE Industrial Solutions 6KBU300 Braking Unit - Manual (Page 23)

6KBU300
—————— DIMENSIONING... AND CORRESPONDING... ——————
4 5
To calculate the value of the costant power (or rated) of the braking resistor using this graphic, it will be possible
to apply the following formula:
continuative power R =
BR
regenerated power
overload factor
f013
Considering having to brake a 30KW motor with overload of 150%, the regenerated power will be at maximum
45KW.
Supposing a braking time of 5 seconds (overload time for the resistor) and 1 break minute, the graphic provides an
overload factor of 3,9, so the rated power of the resistor will be:
= 11.5 kW
45000
3.9
f014
N
OTE
:
The use of the normalized resistors reported at chapter 6 it is strongly reccomended