Lenze EMB9352−C Manual do Utilizador descarregar pdf (Página 87)

Dimensioning

Dimensioning examples

Complex movement



EDBMB935X DE/EN/FR 13.0

Step 1: Calculate brake resistance

gen,max

(725V)

61.25kW

+ 8.58W

Step 2: Determine the number of brake resistors

Three brake resistors are selected with 22 W each which are connected in

parallel.

ƒ Please observe the rated power when dimensioning the brake resistors. It

results from the average braking power of a machine cycle.

Step 3: Calculate the number of brake choppers per brake resistor

Brm

gen,ave

(3s)

@ P

)

36.875kW

3 @ 10kW

+ 1.23 å 2

Every one of the three brake resistors requires two brake choppers.

Alternative: Four brake resistors with 33 W each:

Brm

gen,ave

(3s)

@ P

)

36.875kW

4 @ 10kW

+ 0.92 å 1

The four brake resistors only require one brake chopper each.

 Note!

Technically, both solutions are possible. Please check the solutions

for cost effectiveness.

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Lenze EMB9352−C Manual do Utilizador Página 87