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Current characteristic
①
②
③
I
e
Parameters
In addition to the parameter below, the parameters of the starting mode "voltage ramp"
(Page 134) also apply.
Parameters
Current limiting value
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
Current characteristic with direct-on-line starting without 3RW55 or 3RW55 Failsafe soft starter
Adjustable current limiting value
Voltage ramp
Rated operational current during rated operation
Description
Set the current limiting value, as a factor of the rated motor current, to the maximum current
required during startup. If the set current limiting value has been reached, the motor voltage
is reduced or controlled by the 3RW55 or 3RW55 Failsafe soft starter to prevent the current
from exceeding the set current limiting value.
Select a minimum current limiting value that is high enough to ensure that the torque gener‐
ated in the motor is sufficient to accelerate the motor to nominal speed. 3 to 4 times the value
of the motor's rated operational current I
(Identical to the parameters in chapters Automatic parameterization (Page 132) and Soft
starting with torque control and current limiting (Page 142))
•
Factory setting: 400%
•
Setting range: 125 ... 800%
•
In steps of: 1%
can be assumed as typical here.
e
Functions
8.1 Start-up
141
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