Dimension Brake Chopper And Brake Resistor - Lenze EMB9351-E Instructions De Mise En Service

5.3

Dimension brake chopper and brake resistor

Brake chopper and brake resistor are dimensioned in three steps.
Step 1: Calculate brake resistance
U
+
R
B
P
gen,max
RB
U
P
Step 2: Determine the number of brake resistors
The value must not fall below the brake resistance R
U
ch
375 V
725/765 V
In step 1, R
ƒ
–
Connect two or more brake choppers in parallel to achieve the required
resistance value. (¶ 105)
In step 1, R
ƒ
–
You can use a brake resistor.
I
Tip!
Connect brake resistors of the same value in parallel. That way, the
calculation of the resulting resistance is easier.
EDBMB935X DE/EN/FR 12.0
Dimension brake chopper and brake resistor
2
DC
Brake resistance in W
DC−bus voltage in V
DC
Max. regenerative power in W
gen,max
R
B,min
9 W
18 W
< R results in:
B B,min
³ R
results in:
B B,min
l
Dimensioning
:
B,min
5
79