Lenze EMB9351-E Instructions De Mise En Service page 80

5 Dimensioning
Dimension brake chopper and brake resistor
Step 3: Calculate the number of brake choppers per brake resistor
+
N
Brm
N
N
P
P
Always round the result up to the next integer!
If you want to use only one brake chopper per brake resistor:
Gradually increase the number of brake resistors in the formula until
ƒ
£ 1 (one brake chopper per brake resistor).
N
Brm
)
Note!
Technically, both solutions are possible. Please check the solutions
for cost effectiveness.
80
P (3s)
gen,ave
@ P
N (U )
R N
ch
Number of brake choppers per brake resistor
Brm
Number of brake resistors
R
(3 s) Highest average regenerative power over 3 s (Fig. 3)
gen,ave
(U ) Rated brake chopper power, based on switching threshold U
rated ch
l
^
( 75)
ch
EDBMB935X DE/EN/FR 12.0