Lenze EMB9352−C - Manual (Page 76)

Dimensioning
Important notes
5
l
76 EDBMB935X DE/EN/FR 13.0
5 Dimensioning
5.1 Important notes
(
Stop!
Thermal overload of brake chopper EMB9352 or of the brake
resistor.
If the value falls below the brake resistance R
B,min
or if the
maximum running time of the brake chopper / brake resistor is
exceeded, the components will be overloaded.
Possible consequences:
ƒ The components fail.
Protective measures:
ƒ Always implement the temperature monitoring of the brake
resistor into the emergency stop chain.
ƒ Please observe the running time t
on
and dead time t
off
of the
brake resistor and the brake chopper.
ƒ Calculate the generated braking energy of the application for
brake resistances <R
B,lim
. ( ¶ 79)
– Connect the brake chopper in parallel if the maximum values
of the brake chopper are exceeded.
EMB9352 Dimensioning steps
U
ch
= 375 V U
ch
= 725 V
U
ch
= 765 V
R
B,lim
= 27 W R
B,lim
= 54 W
Brake
resistance R
B
<27 W <54 W
1. Calculate running time and dead time. ( ^ 77)
– Condition "t on + t off = 3 s" must be observed.
2. Dimension brake chopper and brake resistor .
( ^ 79)
³27 W ³54 W
1. Calculate running time and dead time. ( ^ 77)
– The technical data of the brake resistor must be
observed.