Siemens CU240B-2 - Page 245

Advanced commissioning
6.5 Motor control
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
245
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
Description
p1310
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.
p1311
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.
p1312
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").
You can find more information about this function in the parameter list and in function
diagram 6851 of the List Manual.