Dimensioning – Lenze EMB9352−C User Manual
Page 80
Dimensioning
Dimension brake chopper and brake resistor
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
(
^
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.