Technical data

Manual – Gear Units and Gearmotors
107
7
Brakes (→ GM)
Project Planning for AC Motors
Emergency stop
features
In hoist applications it is mandatory that the limits of the permitted maximum work done
(maximum work done see diagrams on page 105) are not exceeded even in the event
of an emergency stop. In other applications, such as travel drives with reduced braking
torques, much higher values can be permitted based on the type of application. Please
consult SEW-EURODRIVE if you need values for increased brake work for emergency
stops.
Brake control
system
Various brake control systems are available for controlling disc brakes with a DC coil,
depending on the requirements and the operating conditions. All brake control systems
are fitted as standard with varistors to protect against overvoltage. Refer to the "Brakes
and Accessories" manual for detailed information about SEW-EURODRIVE brakes.
The brake control systems are either installed directly in the motor conduit box or in the
control cabinet. In case of motors of thermal class H and explosion-proof motors
(eDT..BC), the control system must be installed in the control cabinet.
Standard version As standard, DT/DV...BM(G) AC brake motors are delivered with integrated brake
control system BG/BGE for AC connection or an installed control unit BS/BSG for
DC 24 V connection. The motors are delivered completely ready for connection.
Brake control
system in the
motor conduit box
The supply voltage for brakes with an AC connection is either supplied separately or
tapped from the supply system to the motor in the conduit box. Only motors with a single
speed can be supplied from the motor supply voltage. With pole-changing motors and
for operation on an inverter, the supply voltage for the brake must be supplied
separately.
It is important to take into consideration the brake reaction is delayed by the residual
voltage of the motor in case the brake is powered by the motor supply voltage. The
brake reaction time t
2
I stated in the technical data for cut-off in the AC circuit applies to
a separate supply only.
Motor type AC connection DC 24 V connection
DT56./BMG02, DR63../BR BG without control unit
1)
1) The overvoltage protection must be implemented by the customer, for example using varistors.
DT71../BMG - DV100../BMG BG BS
DV112../BMG - DV225../BM BGE BSG
DV250../BMG - DV280../BMG BGE -