SIMATIC – ET 200pro motor starter
GWA 4NEB 950 5661-02 DS 04
8-23
Soft run-down function
The drive coming to an abrupt standstill on switching off the motor is prevented
by the integrated soft run-down function.
Warning
In the case of a switch-off function with motor brake, the soft run-down with its
delay time works against the braked motor.
Direct start function
Direct start for three-phase induction motors without torque reduction with the
aim of high switching frequency.
Time ramp
The following graphic shows the time ramp of the sDSSte / sDSte, sRSSte /
sRSte with parameterized ramp operation (DI 1.7 = 1):
Figure 8-12: Time ramp / time diagram, sDSSte / sDSte, sRSSte / sRSte
Start voltage
The start voltage should be parameterized in such a way that the motor starts
up rapidly.
Ramp time (start time)
The ramp time should be parameterized in such a way that the motor can power
up within this time.
If the star time of a star-delta start-up is known, the ramp time can be parame-
terized to this value.
Run-down time (stop time)
The parameter "run-down time" sets the duration of the voltage ramp for run-
down. This can achieve an extension of the run-down compared to free run-
down.
If the value 0 is parameterized, free run-down takes place.
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R on
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R off
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