Siemens Sirius 3RW44 System Manual page 87

Stopping time
Typical applications for DC braking
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01
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 braking effect until standstill, the load's mass moment of
inertia should not be higher than 5 times the motor's mass moment of inertia.
≤5 x J
(J ).
load motor
The soft starter has no standstill recognition; if required, this must be
accomplished using external measures.
Motor
Motordreh=
torque(M)
moment (M)
Nominal M
Nennbetrieb
operation
DC braking
DC-Bremsmoment
torque
Motor braking
Motorbrems=
torque moment
Fig. 6-9: DC braking
Lathes (e.g. for tool changeovers) or disk saws.
Stopping time
Auslaufzeit
Stop
Stoppbefehl
am
command at
Sanftstarter
soft starter
Device functions
Time
s
Zeit
s
6-15