Eliminated from:
9400 HighLine SW V07.00.30.00
Behaviour of the new version?
From software version V7.0, selection '3: Active position controller' is also available in code C02570. In contrast to selection '2: Active position controller (<= FW V5.xx)', this selection also considers the gearbox factor.
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Which products are affected?
9400 HighLine SW ≤ V05.01.01.00
What happens?
The drive is rotating at an unexpected motor speed which exceeds the expected speed by the factor of the position encoder/gearbox ratio.
When does the problem occur?
The behaviour occurs if the speed follower (LS_SpeedFollower) is used in conjunction with a load encoder at the output end of the gearbox.
Possible diagnostics?
Using the speed follower (LS_SpeedFollower) in conjunction with a gearbox and a load encoder at the output end of the gearbox results in a motor speed which exceeds the desired motor speed by the gearbox factor.
Short-term measures/recommendations?
The user must specify a speed setpoint which is reduced by the gearbox ratio.
Speed setpoint = Desired speed setpoint / i
Evaluation
The described behaviour only occurs if an encoder is used on the load side and if a gearbox is used between the load and the motor that has a ratio unequal to 1. This combination is not used very often in speed-controlled applications. The described behaviour can be avoided if the speed setpoint is adjusted as explained in
Short-term measures/recommendations.
Published with Service Message No. 05/2009
