Siemens SINAMICS G120 Operating Instructions Manual page 191

Table 9- 29
Parameter
p1310
p1311
p1312
Procedure
Only increase the voltage boost in small steps. Excessively high values in p1310 ... p1312
can cause the motor to overheat and switch off (trip) the inverter due to overcurrent .
● Power-up the motor with an average speed.
● Reduce the speed to just a few revolutions per minute.
● Check whether the motor rotates smoothly.
● If the motor does not rotate smoothly, or even remains stationary, increase the voltage
● Accelerate the motor to the maximum speed with maximum load and check whether the
● If, when accelerating, the motor stalls, increase the voltage boost p1311 until the motor
In most cases, your motor will now behave satisfactorily. You will only have to increase
parameter p1312 for applications with a noticeable break loose torque.
You will find more information about this function in the parameter list and in function
diagram 6300 of the List Manual.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
Parameters for the voltage boost
Description
Permanent voltage boost (factory setting 50 %)
Compensates voltage drops as a result of long motor cables and the ohmic losses in
the motor.
Voltage boost when accelerating (Factory setting 0 %)
Provides additional torque when the motor accelerates.
Voltage boost when starting (Factory setting 0 %)
Provides additional torque, however, only when the motor accelerates for the first time
after it has been switched on ("break loose torque").
boost p1310 until you are satisfied with the motor behavior.
motor follows the setpoint.
accelerates to the maximum speed without any problems.
Functions
9.6 Motor control
189