Which products are affected?
8200vector 0.25 - 90 kW (≤ SW 3.1) with standard I/O or application I/O (≤ SW 3.1)
8200motec 0.25 - 7.5 kW (≤ SW 3.1) with standard I/O or application I/O (≤ SW 3.1)
What happens?
When using the PID controller with feedback via frequency input DFIN, changing the acceleration time (C0012) or the deceleration time (C0013) leads to a short-time overshoot of the output frequency, when the drive is running. This results in a jerk in the motor. When the PID controller is deactivated and the acceleration or deceleration time is changed, the malfunction does not occur when the drive is running.
When does the problem occur?
The problem occurs when the acceleration time (C0012) or the deceleration time (C0013) is changed when the frequency inverter is released and the PID controller is activated with a feedback via frequency input DFIN.
Possible diagnostics?
Observing the drive behaviour of the motor when changing the acceleration or deceleration time, possibly observing code C0051.
Short-term measures/recommendations?
Only change the acceleration and deceleration times when the controller is inhibited. Reduce the dynamic of the PID controller (decrease the 'P' part, increase the 'I' part).
Evaluation
The speed overshoots occur when changing C0012 or C0013. In general, these values are set during set-up.
