Basic functions
7.10 Direction reversal without changing the setpoint
Drive functions
334 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Uncontrollable acceleration of the drive with an external speed actual value
When using an external speed actual value for the speed controller via p1440, positive
feedback can occur in the speed control loop. As a consequence, the drive accelerates up
to its speed limit and can be damaged.
• When using external speed actual values for the speed controller, additionally change
its polarity when reversing the direction of rotation (p1821 = 1).
Note
Position reference is lost at direction reversal
If direction reversal is configured in the da
ta set configurations (e.g. p1821[0] = 0 and
p1821[1] = 1), when the function module "Basic positioner" or "Position control" is activated,
the absolute adjustment is reset after each data set changeover (p2507), as the position
reference is lost when the
direction of rotation is switched over.
Overview of the important parameters (see SINAMICS S120/S150 List Manual)
r0069[0...8]
CO: Phase current actual value
r0089[0...2]
Phase voltage, actual value
p1820[0...n]
Reverse output phase sequence
p1821[0...n]
p1959[0...n]
Rotating measurement configuration
p2507[0...n]
Position control absolute encoder adjustment status
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