Siemens SIRIUS 3RW55 - Voltage Ramp

Functions
7.3 Run-down
SIRIUS 3RW55 soft starter
106 Manual, 08/2018, A5E35630887002A/RS-AB/002
7.3.7
Voltage ramp
Operating principle
With the "voltage ramp" stopping function, the motor voltage is decreased along a linear,
negative voltage ramp until the motor stops.
Application
● Drives that stop abruptly when switched off, causing the transported goods to be
damaged, such as bottling plants.
Diagram
t
1
... t
2
Stopping time
U
rated
Line voltage
Parameters
Parameters
Description
Stopping time The length of the stopping time defines the time within which the motor voltage
is reduced from line voltage to 0 V.
It may take longer for the motor to actually coast down to a standstill.
The parameter value "0" causes the motor to be shut down immediately without
a down ramp.
• Factory setting: 10 s
• Setting range: 0 ... 360 s
• Increment: 0.1 s