Advanced commissioning
6.16 Setpoint processing
SINAMICS G115D distributed drive
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Operating Instructions, 12/2020, FW V4.7 SP13, A5E48681219B-002
Setting the extended ramp-function generator
Procedure
1.
Enter the highest possible speed setpoint.
2.
Switch on the motor.
3.
Evaluate your drive response.
–
If the motor accelerates too slowly, then reduce the ramp-up time.
An excessively short ramp-up time means that the motor will reach its current limiting
when accelerating, and will temporarily not be able to follow the speed setpoint. In
this case, the drive exceeds the set time.
–
If the motor accelerates too fast, then extend the ramp-up time.
–
Increase the initial rounding if the acceleration is jerky.
–
In most applications, it is sufficient when the final rounding is set to the same value as
the initial rounding.
4.
Switch off the motor.
5.
Evaluate your drive response.
–
If the motor decelerates too slowly, then reduce the ramp-down time.
The minimum ramp-down time that makes sense depends on your particular
application. For an excessively short ramp-down time, the converter either reaches the
motor current, or the DC link voltage in the converter becomes too high.
–
Extend the ramp-down time if the motor is braked too quickly or the converter goes
into a fault condition when braking.
6.
Repeat steps 1 … 5 until the drive behavior meets the requirements of the machine or plant.
You have set the extended ramp-function generator.
❒
Basic ramp-function generator
When compared to the extended ramp-function generator, the basic ramp-function
generator has no rounding times.
