Lenze 931E/K Small Drives Control - Manual (Page 31)

Commissioning
Speed control
Setpoint selection via setpoint selectors
5
l
31 SW−HB 13.0002−EN 4.1
Speed
931e_218
You can separately select ramps for CW and CCW rotation and for rising and falling speeds.
If the ramp accelerations are sometimes identical, you can use the [r3 = r1], [r4 = r2] or
[r2 = r3 = r4 = r1] checkboxes to facilitate the entry.
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Note!
The ramp generator should be used when the controller operates in speed
control and no position control – nor in an external control – is available. The
ramps should be selected in a way that ensures that the drive will not exceed
the current limitation when accelerating under realistic load conditions.
When the setpoint ramp is selected correctly, the overshooting of the speed
controller on reaching the setpoint speed can be considerably reduced
compared to operation without setpoint ramp.
In applications with position control (internal or via the external control), the
setpoint ramp must not be activated, because activation will have the same
control effect as a PT
1
filter and reduce the stability of the control circuit.