Current Limiting In Conjunction With A Starting Voltage Ramp And Ramp-Up Detection; Setting The Motor Current - Siemens SIRIUS 3RW30 Manual

12.4.6 Current limiting in conjunction with a starting voltage ramp and ramp-up
detection
Current limiting
The SIRIUS 3RW40 soft starter measures the phase current (motor current) continuously with
the help of integrated current transformers.
The motor current that flows during the startup process can be actively limited by means of
the soft starter. The current limiting function takes priority over the voltage ramp function.
As soon as a parameterizable current limit is reached, in other words, the voltage ramp is
interrupted and the motor is started with the current limiting value until it has started up
successfully. The current limiting function is always active with SIRIUS 3RW40 soft starters. If
the current limiting potentiometer is set to the clockwise stop (maximum), the starting current
is limited to five times the set rated motor current.
12.4.7

Setting the motor current

I potentiometer
e
The rated operational current of the motor must be set with the I
the mains voltage and the motor connection (wye-delta). The electronic motor overload
SIRIUS 3RW30 / 3RW40
Manual, 01/2010, 535 1995-02 DS01
Commissioning
12.4 Commissioning the 3RW40
potentiometer according to
e
103