Siemens SINAMICS G120 Operating Instructions Manual page 226

Advanced commissioning
6.5 Motor control
Requirements
● Depending on the rated power of the motor, set the ramp-up time of the ramp-function
generator to a value of 1 s (< 1 kW) ... 10 s (> 10 kW).
● Increase the starting current in steps of ≤ 5 %. Excessively high values in p1310 ... p1312
can cause the motor to overheat and switch off (trip) the inverter due to overcurrent.
When message A07409 is displayed, it is not permissible that you further increase the
value of any of the parameters.
Procedure
Proceed as follows to set the voltage boost:
1. Switch on the motor with a setpoint of a few revolutions per minute.
2. Check whether the motor rotates smoothly.
3. If the motor does not rotate smoothly, or even remains stationary, increase the voltage
boost p1310 until the motor runs smoothly.
4. Accelerate the motor to the maximum speed with maximum load.
5. Check that the motor follows the setpoint.
6. When required, increase the voltage boost p1311 until the motor accelerates without any
problem.
In applications with a high break loose torque, you must also increase parameter p1312 in
order to achieve a satisfactory motor response.
You have set the voltage boost.
Parameter
p1310
p1311
p1312
You can find more information about this function in the parameter list and in function
diagram 6851 of the List Manual.
226
Description
Starting current (voltage boost) permanent (Factory setting 50 %)
Compensates voltage losses as a result of long motor cables and the ohmic losses in
the motor.
After commissioning, depending on the motor power rating and the technological ap-
plication p0501, the inverter sets p1310.
Starting current (voltage boost) when accelerating(Factory setting 0%)
Provides additional torque when the motor accelerates.
After commissioning, depending on the motor power rating and the technological ap-
plication p0501, the inverter sets p1311.
Starting current (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").
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB