Corrected from:
- Inverter Drives 8400 HighLine V14.00.00
- Inverter Drives 8400 TopLine V14.00.00
Response of the new version:
More stable current controller feedforward control operation even if the magnetising inductance is not set correctly.
Which products are affected?
8400HighLine and TopLine: 11.00.00.00 ≤ FW version ≤ 13.00.00.00
What happens?
When a certain speed is exceeded, the drive accelerates in an uncontrolled fashion. The actual speed abruptly disassociates from the setpoint speed and no longer responds to setpoint changes.
When does the problem occur?
Depending on a magnetising inductance that is parameterised too high (> 4 % deviation) and an activated current controller feedforward control C0079, the response described occurs. The response occurs with servo control (SC), irrespective of the feedback system.
Diagnostics options?
If drive constellations are affected, according to current knowledge the response is 100 % repeatable. However, not all ASM are affected.
Short-term measures/recommendations?
The most reliable protection against this maloperation is not to activate code C0079.
As an alternative, the motor parameters are to be identified using the extended identification mode.
Evaluation:
The activation of the current controller feedforward control only offers a small benefit compared to the given risk; therefore it should not be used until the correction.
For present applications, a balanced appreciation is advisable, taking the following criteria into consideration:
- Has the current controller feedforward control for the application been activated?
- Is the application run at high speeds?
- Has no motor parameter identification been carried out with the extended procedure?
If all questions have been answered with 'Yes', there is an increased risk that the response occurs.
