Which products are affected?
8200vector (SW 3.5), 8200motec (SW 3.5)
What happens?
If the flying restart circuit function is used in 'vector control' mode, when trying to 'catch' the coasting down motor, the motor may be decelerated to an output frequency of 0 Hz and then accelerated using the acceleration ramp (C0012) instead of being 'restarted correctly on the fly'.
When does the problem occur?
The problem occurs if the flying restart circuit function is used during vector control mode.
Possible diagnostics?
Observe the performance of the drive controller and code C0050. When the drive controller tries to catch the coasting motor, the motor is slowed down to standstill (C0050 indicates 0 Hz) and accelerated back up to the setpoint using the acceleration ramp (C0012) afterwards.
Short-term measures/recommendations?
Use V/f characteristic control mode if possible.
Evaluation:
The flying restart circuit function should not be used in combination with 'vector control' mode. At present, the flying restart circuit function can only be used without problems in 'V/f characteristic control' mode and 'V/f² characteristic control' mode with frequency inverters equipped with software version 3.5.
