Lenze EMB9352−C - Manual (Page 80)

Dimensioning
Dimension brake chopper and brake resistor
5
l
80 EDBMB935X DE/EN/FR 13.0
Step 3: Calculate the number of brake choppers per brake resistor
N
Brm
+
P
gen,ave
(3s)
N
R
@ P
N
(U
ch
)
N Brm Number of brake choppers per brake resistor
N
R
Number of brake resistors
P
gen,ave
(3 s) Highest average regenerative power over 3 s (Fig. 3)
P
rated
(U
ch
) Rated brake chopper power, based on switching threshold U
ch
( ^ 75)
Always round the result up to the next integer!
If you want to use only one brake chopper per brake resistor:
ƒ Gradually increase the number of brake resistors in the formula until
N
Brm
£ 1 (one brake chopper per brake resistor).
)
Note!
Technically, both solutions are possible. Please check the solutions
for cost effectiveness.