Current Limiting Function - Siemens SIRIUS 3RW50 Manual

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
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
②
③
I
e
SIRIUS 3RW50 soft starter
Manual, 09/2019, A5E35628455002A/RS-AA/001
Current characteristic with direct-on-line starting without 3RW50 soft starter
Adjustable current limiting value
Voltage ramp
Rated operational current during rated operation
7.2 Current limiting function
, the voltage ramp function is aborted and
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Functions
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