Pole position identification (PPI) works incorrect after limitation to maximum frequency of 599 Hz was active (corrected from V02.10.12)
Corrected from: i700 servo inverter V2: from V02.10.12.11906
i700 servo inverter V1: from V01.10.12.11905
Response of the new version:
The pole position identification (PPI) works correctly, independently of the limitation function to the maximum frequency of 599 Hz.
What happens?
The pole position identification (PPI) identifies an incorrect pole position information if the limitation to the maximum frequency of 599 Hz was active before.
When does this behaviour occur?
The pole position identification (PPI) is executed after the limitation to the maximum frequency of 599 Hz was active.
All three PPI modes are concerned.
Which products are affected? i700 servo inverter V2
i700 servo inverter V1
Short-term measures:
Only execute the pole position identification (PPI) if the limitation to the maximum frequency of 599 Hz was not active before.
Evaluation/recommendations:
Synchronous motor operation without correct pole position identification may lead to an uncontrolled motor rotation.
In practical operation, the probability of occurrence of the above-described behaviour is considered to be very low because the PPI is usually carried out during commissioning or, at least, before selecting a setpoint.
