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Calculation of brake power

Valid for AKD, S300, S400, S600, S700

The calculated Power Dissipation can be used for selecting a brake resistor or capacitor module.

A part of the brake energy is stored in the DC link bus capacitors of the servo amplifier. If these capacitors are filled, the brake energy is led to the Brake Resistor. The calculated power dissipation PBrems is the possibly maximum value.

Electrical Energy stored in the DC Link – Capacitors

Amplifier Capacity WC /{Ws}
3 x 480 V Mains
WC /{Ws}
3 x 400 V Mains
WC /{Ws}
3 x 230 V Mains
WC /{Ws}
3 x 110 V Mains
S300 (S3xx61) 860 µF - - 24 6
S300 (S3xx01) 215 µF 26 22 6 -
S403-406 Master 930 µF - - 25 7
S443-446 Master 270 µF - 28 7 -
S4xx Slave 50 µF - 5 1,4 0,4
S601...610 235 µF 29 24 6,5 -
S614/S620 470 µF 57 48 13 -
S640 2000 µF 243 205 55 -
S670 3000 µF 365 308 82 -
S7010-7030 235 µF 29 24 6,5 -
S7060-7120 470 µF 57 48 13 -
S7240 630 µF 77 65 17 -
S7016-7036 500 µF - - 14 7
S7066-7126 1000 µF - - 27 14
S7246 1600 µF - - 43 22
S748/S772 900 µF 110 92 24 -
AKD-x00306 940 µF - - 20 60
AKD-x00606 940 µF - - 20 60
AKD-x01206 2460 µF - - 55 160
AKD-x02406 2720 µF - - 60 180
AKD-x00307 235 µF 20 35 5 -
AKD-x00607 235 µF 20 35 5 -
AKD-x01207 470 µF 40 70 10 -
AKD-x02407 680 µF 60 110 15 -

Reduced Speed without brake resistor

Berechnung_Bremsleistung_n2.gif

Rest of the Mechanical Energy is Brake Power

Berechnung_Bremsleistung_Wbrems.gif

Calculate Power Dissipation

Berechnung_Bremsleistung_Pbrems.gif

Legend

n1 Maximum Speed of the Motor (rpm)
Wc Electrical energy stored in the DC Link  capacitors (Ws),
depends on the mains supply voltage, see table
J Inertia of the Motor (kgm2)
Jext Inertia of the Load (kgm2)
n2 Reduced Speed of the Motor (rpm) (differential energy in the link capacitors)
N Number of Cycles
t Time Period