Braking Operation With External Brake Resistor; Operation At Rated Mains Voltage 230 V - Lenze 8400 Hardware Manual

8 Braking operation

Braking operation with external brake resistor

Operation at rated mains voltage 230 V

8.2 Braking operation with external brake resistor
To decelerate greater moments of inertia or with a longer operation in generator mode an
external brake resistor is required. It converts braking energy into heat.
The brake resistor is connected if the DC-bus voltage exceeds the switching threshold. This
prevents the controller from setting pulse inhibit through the "Overvoltage" fault and the
drive from coasting. The external brake resistor serves to control the braking process at any
time.
The brake chopper integrated in the controller connects the external brake resistor.
Adapt the switching threshold to the mains voltage (C00173/C00714, see software
ƒ
manual).

Note!
DC-bus system without the use of a regenerative module:
ƒ
ƒ
8.2.1 Operation at rated mains voltage 230 V
Switching threshold V
Type
E84AVxxx2512
E84AVxxx3712
E84AVxxx5512
E84AVxxx7512
E84AVxxx1122
E84AVxxx1522
E84AVxxx2222
252
Up to and including software version V02.xx.xx, only an internal brake
chopper can be used in the DC-bus system to dissipate the regenerative
energy.
Starting from software version V12.00.00, all internal brake choppers can be
used in the DC-bus system to dissipate regenerative energy ("master-slave
operation").
More information can be found in the "Braking operation/brake energy
management" chapter of the reference manual.
: 380 V, adjustable
BRmax
R I
Bmin BRmax
[] [A]
180 2.1
180 2.1
100 3.8
100 3.8
33 11.5
33 11.5
33 11.5
R Minimum brake resistance, nominal value ±10 %
Bmin
I Peak current
BRmax
P Peak braking power
BRmax
I Continuous current RMS - important for the dimensioning of the cables
BRd
P Continuous braking power
Bd
t Cycle time, periodic load change with running time and recovery time
Z
t Running time
on
t - t Recovery time
Z on
t Maximum running time without initial load and compliance with the recovery
fp
time

P I P
BRmax BRd Bd
[kW] [A] [kW]
0.8 1.6 0.6
0.8 1.6 0.6
1.4 2.8 1.1
1.4 2.8 1.1
4.4 8.6 3.3
4.4 8.6 3.3
4.4 8.6 3.3
t t t
Z on fp
[s] [s] [s]
-  -

- -
-  -

- -
-  -
-  -
-  -
EDS84ASC552 EN 10.0