Lenze EMB9352−C - Manual (Page 83)

Dimensioning
Dimensioning examples
Translatory movement
5
l
83 EDBMB935X DE/EN/FR 13.0
Step 1: Calculate brake resistance
R
B
+
U
DC
2
P
gen,max
+
(725 V) 2
55 kW
+ 9.55 W
Step 2: Determine the number of brake resistors
Two brake resistors are selected with 18
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
N
Brm
+
P
gen,ave
(3s)
N
R
@ P
N
(U
ch
)
+ 34.375 kW
2 @ 10 kW +
1.72 å 2
Every one of the two brake resistors requires two brake choppers each.