Braking operation with three-phase AC brake motor
13
Braking operation
13.3
L
13.3-1
EDS82EV903-1.0-11/2002
13.3 Braking operation with three-phase AC brake motor
Lenze three-phase AC motors and G-motion geared motors can be equipped
with spring-operated brakes. Brake rectifiers are required to supply
spring-operated brakes with DC voltage (180 V DC, 205 V DC).
The selection of brake rectifiers depends on the input voltage U
AC
and the rated
voltage of the brake coil (V
coil
):
Brake rectifier selection
Type/Order
No.
Max. input
voltage V
AC
Output voltage
V
DC
Max. output
current
Example
Bridge rectifier
6-pole
E82ZWBR1 270 V +0 % a
DC
=0.9xV
AC
0.75 A a
coil
= 205 V
DC
≡
a
DC
at U
AC
= 230 V
Half-wave
recitifier 6-pole
E82ZWBR3 460 V +0 % a
DC
=0.45xV
AC
0.75 A a
coil
= 180 V
DC
≡
a
DC
at U
AC
= 400 V
)
))
) Note!
Lenze geared motors with brake motor and Lenze three-phase
AC brake motors are delivered with a four-pole brake rectifier.
This enables the brake to be switched via the AC side without any
additional measures.
The brake can be switched on the DC side and on the AC side. The relay output
of the controller can be used for brake switching. Alternatively, the brake can be
switched via an external control contact (e.g. PLC).
With DC switching the delay times are considerably shorter. Thus it is possible,
for instance, to implement a switch-off positioning with reproduceable brake
path.
(
((
( Stop!
If you control a holding brake at the motor with the relay output a
spark suppressor must be used in case of DC switching to
protect the switch contacts:
l Universal spark suppressor for 24 V DC brake,
l 6-pole Lenze brake rectifier for 180 V/205 V DC brake.
l The service life of the relay depends on the type of load (ohmic,
inductive or capacitive) and the value of the switching capacity.
Operation with spring-operated
brake and brake rectifier
Howtoswitchthebrake
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