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Functions
7.2 Start-up
Parameters
Parameters
Current limiting value
In addition, the parameters of the torque control startup function apply.
7.2.7
Direct-on-line starting
Operating principle
The motor is switched on immediately without closed-loop control in the direction of rotation
(right/CW = line phase direction). This takes place without being influenced by current
limiting by the soft starter, for example.
If the "direct" starting mode is set, the motor voltage is increased immediately to the level of
the supply voltage once the start command has been issued. This is equivalent to the start
behavior with a contactor, i.e. no limitation of the starting current and the starting torque.
92
Description
Set the current limiting value, as a factor of the rated motor current, to the
maximum current required during startup. Once the set current limiting
value has been reached, the motor voltage is reduced or controlled by the
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 generated in the motor is sufficient to accelerate the motor to
nominal speed. Three to four times the value of the motor's rated
operational current (I
) can be assumed as typical here.
e
(Identical with the parameter of the Soft starting with voltage ramp and
current limiting (Page 89) / Automatic parameterization (Page 81))
Factory setting: 400 %
•
Setting range: 125 ... 800 %
•
Increment: 1%
•
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
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