Siemens 3RW51 Series, Руководство пользователя, Страница: 87 / 192

Functions
7.2 Current limiting function
3RW51 Soft Starter
Manual, 06/2019, A5E37108631002A/RS-AB/002
87
Parameters
Parameter Description
Current limiting value In order to ensure that the drive can reach its rated speed, the minimum
current limiting value that you select must be high enough to generate
sufficient torque in the motor.
A typical value is three to four times the rated operational current (I
e
).
As soon as the current limiting value is reached, the motor is started
with this value until it has reached its rated operating speed. In this
case, the motor starting times may be longer than the maximum
parameterizable ramp-up time.
The maximum possible current limiting value for the 3RW51 soft starter
("max." position) is 7x the value of the maximum rated operational
current for the 3RW51 soft starter, where this value is identical to 7x the
value of the maximum rated operational current I
e
which can be set.This
value is independent of the actual rated operational current I
e
of the
motor set at the 3RW51 soft starter
Example
①
Rated operational current I
e
of the motor
•
I
e
motor = 29 A
②
Maximum current limiting which can be set at this soft starter: Imax = 7 x 47 A = 329 A