Eliminated from:
Inverter Drives 8400 StateLine, HighLine and TopLine from firmware version 12.00.00.00
Behaviour of the new version?
Restart on the fly in the SLVC control mode works correctly even if a change-over from the ASM servo control to SLVC has been carried out before.
Which products are affected?
Inverter Drives 8400 StateLine, HighLine and TopLine with a firmware version lower than 12.00.00.00
What is the response?
The flying restart process is apparently executed; however, the rotor speed is not determined correctly. There is no error message indicating that the flying restart process has not been successful. Finally a zero start frequency is applied. This brings about a compensation process; a clicking noise can be heard. When a high motor speed and/or high load torque is applied, an overcurrent or short circuit error (OC7 or OC1) in the inverter may occur.
When does the problem occur?
If an asynchronous motor is actuated in servo control (C0006 = 2) first and then the control mode is switched over to SLVC (C0006 = 4). Then the motor can no longer be restarted on the fly correctly after controller inhibit has taken place.
Diagnostics options?
The flying restart process apparently only works correctly if the mains has been switched before and motor control type C006 has not been changed.
Short-term measures/recommendations?
If the mains on the inverter has been switched (incl. control card supply) after the control mode has been switched from ASM servo control to SLVC, the behaviour does not occur.
Evaluation:
If the behaviour causes the monitoring function to respond with an error, the motor is not controlled in the speed as expected, but coasts down. Usually the motor control type is not switched over online. In practice, the response will hardly ever occur, or if it does, it will occur during commissioning.
