Device Functions
SIRIUS 3RW44 System Manual
6-14 GWA 4NEB 535 2195-02 DS 04
Stopping time 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.
Note
The real stopping time can vary during braking processes when the combined
braking function is applied.
Figure 6-8:Combined braking
Stopping mode: DC 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 9 for wiring suggestions.
The optimum parameters must be adjusted on the machine under appropriate
load conditions.
DC braking torque The DC braking torque determines the brake force of the motor.
4_10_Menue_AuslaufartKombiniertes_Bremsen (2).wmf
Motor
torque
M
M
Nominal operation
Stop command
at soft starter
Stopping time
DC braking torque
Dynamic
braking torque
Motor
braking torque
Time (t)
s
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