GE Industrial Solutions AF-650 GP General Purpose Drive - Manual (Page 20)

6.1.6 Braking of Inertia
In the case of braking of high inertia values on the motor shaft, the brake resistor values can be based on the inertia, Δω, Δt. See the illustration below.
Δt is determined by the decel time.
NB!
The decel time goes from the rated motor frequency to 0 Hz.
P
peak
can be calculated as:
Ppeak = ηmotor × wstart × j ×
Δ w
Δ t
Ppeak = ηmotor × ηdrive × ηstart × j Ч
(
2 Ч π
60
)
2 × Δn
Δ t
j is the inertia of the motor shaft.
Calculate the value on the brake resistor as described under the preceding paragraphs.
AF-650 GP Brake Resistor Design Guide
19
6