Overcurrent Protection - Siemens SINAMICS G110D Operating Instructions Manual

Functions
6.8 Protection functions
6.8.3

Overcurrent protection

Method of operation
The maximum current controller (I
overload by limiting the output current. The I
If an overload situation occurs, the speed and stator voltage of the motor are reduced until
the current is within the permissible range. If the motor is in regenerative mode, i.e. it is
being driven by the connected machine, the I
voltage of the motor to reduce the current.
Note
The inverter load is only reduced if the frequency is reduced with a lower load and at lower
speeds (e.g. parabolic torque-speed characteristic of the motor load).
In the regenerative mode, the current only decreases if the torque decreases at a higher
frequency.
Settings
Note
The factory setting of the I
appropriately trained personnel.
Table 6- 34
Parameter
P0003 = 3
P0305 = ...
P0640 = ...
P1340 = ...
P1341 = ...
P1345 = ...
P1346 = ...
r0056 bit13
r1343
r1344
For more information about this function, see function diagram 6100 in the List Manual.
126
max
controller only needs to be changed in exceptional cases by
max
I controller parameters
max
Description
User access level
3: Expert
Rated motor current
Maximum permissible motor overload referred to P0305 rated motor current
Proportional gain of controller for frequency reduction
Integral time of controller for frequency reduction
Proportional gain of controller for voltage reduction
Integral time of controller for voltage reduction
Status: I controller active
max
Frequency output of I
max
Shows the amount to which the I-max controller reduces the inverter output frequen-
cy.
Voltage output of I controller
max
Shows the amount by which the I-max controller reduces the inverter output voltage.
controller) protects the motor and inverter against
controller is only active with V/f control.
max
controller increases the speed and stator
max
controller
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
SINAMICS G110D