Siemens SINAMICS G220 - Overcurrent Protection; Speed Control

14.10.4.7 Overcurrent protection
Overview
To limit the motor current, when reaching the current limit, the I_max controller reduces the
output frequency and the motor voltage.
Requirement
The U/f control is active.
Description of function
When reaching the current limit, the I_max controller has the following e󹪜ect on motor
operation:
• When accelerating, the I_max controller extends the acceleration phase.
• When braking, the I_max controller extends the braking phase.
• Steady-state operation:
– For characteristic "U/f control for a drive that requires precise frequency", the I_max
controller reduces the motor voltage until the motor current returns to the permissible
range.
– For all other U/f characteristics, the I_max controller reduces the speed and the motor
voltage until the motor current returns to the permissible range.
Parameters
The following list contains the parameters of the "Overcurrent protection" function.
Number Name Unit
r0056.0...15 Status word, closed-loop control 
p0305[0...n] Rated motor current [Arms]
p0640[0...n] Motor current limit [Arms]
p1340[0...n] I_max frequency controller proportional gain 
p1341[0...n] I_max frequency controller integral time [s]
r1343 I_max controller frequency output [rpm]
14.10.5 Speed control
14.10.5.1 Speed control
Overview
Speed control comprises current regulation and higher-level speed control.
Functions
14.10Closed-loop drive control
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 507