L_SdSpeedSet: S-smoothening at ramp changeover (corrected from V2.17.0)
Corrected from: LenzeServoDrive.lib version V02.14.02.00
included in the Engineer catalogue from V02.17.00.00
Response of the new version?
The new ramp times are accepted immediately when a change-over of the ramp times is carried out.
Which products are affected? The L_SdSpeedSet function block from the LenzeServoDrive.lib library with a lower version than V02.14.02.00.
What happens? In the case of a change-over of the ramp parameters via the inputs bTi1…bTi4, the output dnSpeedSetpointOut_n does not follow the new ramp parameters immediately. Apparently the change-over to the new ramp steepness is effected with an S-smoothening in spite of the jerk time=0ms that is set.
When does the problem occur? In the case of a change-over of the ramp parameters via the inputs bTi1…bTi4 without a change-over from acceleration to deceleration.
Diagnostics options?
The response can be analysed by means of the Engineer oscilloscope by recording the output of the ramp generator during the time of change-over. The apparent smoothening between two different deceleration ramps can be influenced unexpectedly by variation of the acceleration time. It would only be expected that the jerk time has an impact.
Short-term measures/recommendations? None.
Evaluation: A change-over of the ramps is explicitly intended for the L_SdSpeedSet block via the inputs bTI1, bTI2, bTI4, bTI8. During this change-over with a jerk time=0ms, operation is not, as expected, run with the new acceleration or deceleration immediately, but the acceleration/deceleration is reduced depending on the active acceleration time. Therefore the acceleration/deceleration is not as expected, and the acceleration or deceleration time is longer or shorter than expected. In typical applications with this ramp generator this does not have a negative effect.
