Siemens SIRIUS 3RW50 - 7.2 Current limiting function

Functions
7.2 Current limiting function
SIRIUS 3RW50 soft starter
Manual, 09/2019, A5E35628455002A/RS-AA/001
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7.2 Current limiting function
Operating principle
Activate the current limiting function if you want to ensure that a specific current value is not
exceeded during motor starting. The motor is always started up with the voltage ramp. If the
current exceeds the parameterized current limit x I
e
, the voltage ramp function is aborted and
the current limitation function starts. The current limitation function remains active until the
3RW50 soft starter has detected the motor ramp up and the motor is in a normal operating
state.
Application
● Avoiding current surges
● Reducing energy costs
Current path
①
Current characteristic with direct-on-line starting without 3RW50 soft starter
②
Adjustable current limiting value
③
Voltage ramp
I
e
Rated operational current during rated operation