Device Functions
SIRIUS 3RW44 manual
6-16 GWA 4NEB 535 2195-02 DS 02
Note
To control the motor with the specified slow speed parameters, "Slow speed"
must be assigned to one control input, and "Motor right PS1/2/3" or "Motor left
PS1/2/3" must be assigned to the other. Also refer to the circuit proposal in
Chapter 8.1.7.
Directions of rotation:
Right: rotation in line phase direction
Left: rotation counter-clockwise to the line phase direction
Caution
Due to the reduced motor speed and the accompanying reduced self-cooling of
the motor this operating mode is not recommended for contiuous operation.
Caution
Risk of damage to property.
For optimum motor protection use a combination of electronic motor overload
protection and evaluation of a temperature sensor integrated into the motor.
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 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.
(J
Load
≤ 5xJ
Motor
).
The soft starter has no standstill recognition; if required, this must be
accomplished using external measures.
Fig. 6-10: DC braking
Typical applications for DC braking
Use "DC braking" in lathes (e.g. for tool changeover) or disk saws.
Motor
torque (M)
M
Nominal
DC braking torque
Motor braking
torque
Stop command
at soft starter
Stopping time
Time
s
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