Remedied from:
8400 StateLine SW V4.01 onwards
Behaviour of the new version?
The above-named software version rectifies this functional restriction.
Which products are affected?
8400 StateLine SW ≤ V4.00
What happens?
The drive connects with a speed setpoint of 0 rpm to a coasting machine and accelerates afterwards to the speed setpoint pending at the drive controller.
It may happen that Imax, possibly with clamp operation (OC11, OC17), or an overcurrent interruption of the drive controller (OC10) appears.
If the drive is decelerated and accelerated again afterwards a load impulse in the machine may be the result.
When does the problem occur?
Drives operated in V/f control mode with encoder (C0006/0 = 7 or 9) are affected. The behaviour described appears when the drive has to connect to a coasting machine after pulse inhibit. The pulse inhibit may for example be caused by mains failure, controller inhibit, overvoltage in the DC bus due to operation in generator mode, etc. .
Drives with a large moment of inertia are typical applications.
Possible diagnostics?
Fast deceleration and subsequent acceleration of the drive; if necessary disconnection with OCx or corresponding entries into the history buffer.
Short-term measures/recommendations?
Update of the StateLine firmware to SW >4.00
Evaluation:
When new machines are set up, this behaviour is usually detected during commissioning.
In case of series machines or machines which are already in operation the behaviour may appear when the firmware version has been changed from < V04.00 to V04.00.
If this behaviour appears it may happen that the material to be produced is influenced in a negative way. It is improbable that the machine is damaged. Injury to persons can be excluded.
Published with service message No. 2009/40
