Siemens SIRIUS 3RW55 - External Motor Standstill Detection; External Motor Standstill Detection (Page 162); Sensorless Motor Standstill Detection

8.2.6.4 Sensorless motor standstill detection
Operating principle
The 3RW55 soft starter features integrated sensorless motor standstill detection. With this
function, all stopping modes with braking can be brought to an end in good time as soon as the
motor is at a standstill. The function can also be used independently of the stopping mode.
Application
• Timely detection of motor standstill for terminating braking
Validity
This function is not available for the 3RW55 Failsafe soft starter.
Requirements
• 3RW55 soft starter from 󹪝rmware version V2.0
• Start-up completed
If standstill detection is required before start-up has been completed or in inching mode, use
a standstill monitoring function with an encoder.
Setting via 3RW5 HMI High Feature
• Menu: "Parameters > Soft Starter > Parameter set 1 / 2 / 3 > Stopping mode settings"
• Access protection to the 3RW5 HMI High Feature is not active or has been reset.
Parameters
Parameters Meaning
Sensorless motor standstill detection
• Activated (factory setting)
• Deactivated
8.2.6.5 External motor standstill detection
Operating principle
The 3RW55 soft starter detects standstill of the motor shaft by external motor standstill
detection. With this function, all stopping modes with braking can be brought to an end in good
time as soon as the motor is at a standstill. The function can also be used independently of the
stopping mode.
Application
• Timely detection of motor standstill for terminating braking
Functions
8.2 Run-down
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
162 Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006