Power failure control: A power failure is incorrectly detected during a dynamic load change (corrected from V01.04.01)
Corrected from:
Servo inverter i950 FW: from V01.04.01.1471
Response of the new version:
The power failure control function has now been extended by an additional condition to avoid incorrect response.
As an additional condition for the detection of a power failure, the current DC voltage in the DC link must now be below 90% of the nominal DC voltage
What happens?
Power failure control function: In extreme operating conditions, a power failure can be falsely detected.
When does the behaviour occur? Function for mains failure control active (0x2D66:1 = 1) and
very quick and dynamic load changes between motor and generator operation happen.
Which products are affected:
Servo inverter i950 FW
Short-term measures, Evaluation/recommendations: Parameter 0x2D66:2 threshold for the detection of a power failure should be decreased. In result the detection will act less sensitive. However, if the threshold value is set too low, an actual power failure may be detected too late.
