Question:
How can overload messages (OCx) be avoided for short acceleration times (often occurs in case of positioning drives)?
Answer:
Acceleration time settings < 1 may cause fault indications OC3, OC4, OC5 and even OC1in extreme situations.
This behaviour results from the fact that the DC-speed controller (Imax controller/M controller) cannot follow the dynamic process; thus the peak current initiates too late.
The modification of the Imax controller's integral action time (C0078) enables an adjustment.
Measures:
- Reduce value in C0078 => Imax controller accelerates (with more dynamic)
- Reduce value in C0077 => Imax controller influence decreases
