If speed setpoint = 0, the motor does not start when the nMin / nMax speed limits are used (eliminated from V5.0 onwards)

Eliminated from:
StateLine / HighLine with firmware version V05.01 or higher

Behaviour of the new version?
If speed setpoint = 0, the positive nMin limit is always approached because it has become the preferred speed.
From FW V4.0 the positive or negative minimum speed is directly approached, depending on the speed setpoint. A speed setpoint of 0 % counts as a positive value.

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Which products are affected?
8400 StateLine / HighLine with FW < 05.01

What happens?
In the speed setpoint path, speed limits for the positive and negative direction of rotation can be selected directly before the motor control. If a value of > 0 % has been set as minimum speed limit, the speed setpoint (e.g. from the analog input) needs to exceed the minimum speed first so that the drive is able to rotate.

When does the problem occur?
If the nMin / nMax limits are used in the MCK.

Possible diagnostics?
Speed does not correspond to the selected limit

Short-term measures / recommendations?
If the setpoint is selected via the analog input, the function of a minimum speed can be realised by using an offset and a gain.

Evaluation:
The definition of the function has been changed and is no longer compatible with previous firmware versions. However, the function was not used very often or not at all because it could not be used for minimum speeds.


Information taken from chapter 1.1.17 of Service Message No. 16/2010.