Function extension:
For the i700 servo inverter, the speed controller is processed in a fast task with a cycle time of 250 µs. The lower-level current controller is even processed 4 times more (cycle time: 62.5 µs). The torque setpoint as input value for the fast current controller is evened out via an interpolation function.
On the one hand, this minimises a possible noise generation on the machine.
On the other hand, however, the interpolation function leads to a dead time in the closed speed control loop, due to which the stability limit may already be reached in the case of a lower control loop gain.
For an optimum adaptation to the application requirements, the interpolation function for the torque setpoint can now be activated or deactivated:
Contained in which products?
- i700 servo inverter from V01.07.05.10577
Application:
Deactivated interpolation function:
- Applications with high requirements on dynamic drive behaviour, e.g. positioning applications with high path quality requirements (low following error).
- Maximum control loop gain can be set.
Interpolation function active (as before):
Torque mode: Operation as torque follower without higher-level speed control loop.
Lowest possible noise generation.
With superimposed speed control loop: Achievable control loop gain is slightly lower than without interpolation function.
