Direction Reversal Without Changing The Setpoint - Siemens SINAMICS S120 Function Manual

4.17

Direction reversal without changing the setpoint

Features
S Not change to the speed setpoint and actual value, the torque setpoint and
actual value and the relative position change.
S Only possible when the pulses are inhibited
Caution
If direction reversal is configured in the data set configurations (e.g. p1821[0] = 0
and p1821[1] = 1), then when the function module basic positioner or position
control is activated, the absolute adjustment is reset each time the system boots
or when the direction changes (p2507), as the position reference is lost when the
direction reverses.
Description
The direction of rotation of the motor can be reversed using the direction reversal
via p1821 without having to change the motor rotating field by interchanging two
phases at the motor and having to invert the encoder signals using p0410.
The direction reversal via p1821 can be detected as a result of the motor direction
of rotation. The speed setpoint and actual value, torque setpoint and actual value
and also the relative position change remain unchanged.
The direction change can be identified as a result of the phase voltage (r0089).
When the direction reverses, then the absolute position reference is also lost.
In the vector control mode, in addition, the output direction of rotation of the drive
converter can be reversed using p1820. This means that the rotating field can be
changed without having to interchange the power connections. If an encoder is
being used, the direction of rotation must, when required, be adapted using p0410.
Overview: key parameters
S r0069
S r0089
S p1820
S p1821
S p2507
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Direction reversal without changing the setpoint
Phase current, actual value
Actual phase voltage
Direction of rotation reversal of the output phases (vector)
Reversal of direction
LR absolute encoder adjustment status
Extended Functions
4-225