Lenze EMB9351-E Instructions De Mise En Service page 87

Step 1: Calculate brake resistance
U
+
R
B
P
gen,max
Step 2: Determine the number of brake resistors
Three brake resistors are selected with 22 W each which are connected in
parallel.
Please observe the rated power when dimensioning the brake resistors. It
ƒ
results from the average braking power of a machine cycle.
Step 3: Calculate the number of brake choppers per brake resistor
+
N
Brm
Every one of the three brake resistors requires two brake choppers.
Alternative: Four brake resistors with 33 W each:
+
N
Brm
The four brake resistors only require one brake chopper each.
)
Note!
Technically, both solutions are possible. Please check the solutions
for cost effectiveness.
EDBMB935X DE/EN/FR 12.0
2
2
(725 V)
DC + + 8.58 W
61.25 kW
P (3s)
+ 36.875 kW
gen,ave
3 @ 10 kW
@ P
N (U )
R N DC
P (3s)
+ 36.875 kW
gen,ave
4 @ 10 kW
@ P
N (U )
R N
ch
l
Dimensioning
Dimensioning examples
Complex movement
+ 1.23 å 2
+ 0.92 å 1
5
87