Commissioning
13.2 Commissioning the 3RW40
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005
113
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 clockwise stop, the starting current is limited to
the maximum possible current (refer to chapter Setting the current limiting value (Page 114)).
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