Siemens Sirius 3RW44 System Manual page 86

Device functions
Stopping time
Stopping mode: DC braking
DC braking torque
6-14
The stopping time determines how long braking torque is applied to the motor.
The braking time should be long enough to bring the load to a complete
standstill.
To achieve a sufficient brake effect until standstill, the centrifugal mass (J) of the
load should not exceed that of the motor. The stopping time should be selected
such that the motor comes to a standstill. The soft starter has no standstill
recognition; if required, this must be accomplished using external measures.
Motor
torque (M)
M
Nominal operation
DC braking to rque
Dynamic
braking to rque
Motor
braking to rque
Fig. 6-8: Combined braking
If the DC braking function is selected, the stopping time and DC braking torque
parameters can be configured on the starter. With this braking type, one output
of the soft starter must be switched over to DC braking to control an external
brake contactor. Please refer to Chapter 8 for wiring suggestions.
The optimum parameters must be adjusted on the machine under appropriate
load conditions.
The height of the DC braking torque determines the brake force of the motor.
Stop command
at
soft starter
Stopping time
Time
s
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01