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6.7
Drive protection
6.7.1
Overcurrent protection
Overview
The U/f control prevents too high a motor current by influencing the output frequency and the
motor voltage (I-max controller).
Precondition
You have selected U/f control.
The application must allow the motor torque to decrease at a lower speed.
Function description
The I-max controller influences the output frequency and the motor voltage.
If the motor current reaches the current limit during acceleration, the I-max controller extends
the acceleration operation.
If the motor load is so high during steady-state operation that the motor current reaches the
current limit, then the I-max controller reduces the speed and the motor voltage until the motor
current returns to the permissible range again.
If the motor current reaches the current limit during deceleration, the I-max controller extends
the deceleration operation.
Parameters
You only have to change the factory settings of the I-max controller if the drive tends to oscillate
when it reaches the current limit or if it is shut down due to overcurrent.
Table 6-66
Number
r0056.0 ... 13
p0305[M]
p0640[D]
p1340[D]
p1341[D]
r1343
You will find more information about this function in function diagram 6300 and in the parameter
list.
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
I-max controller parameters
Name
CO/BO: Status word, closed-loop control
Rated motor current
Current limit
I_max frequency controller proportional gain
I_max frequency controller integral time
CO: I_max controller frequency output
Advanced commissioning
6.7 Drive protection
Factory setting
-
0 Arms
0 Arms
0
0.300 s
- rpm
301
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