Changing The Direction Of Rotation Without Changing The Setpoint - Siemens Sinamics S110 Function Manual

Drive functions
7.2 Basic functions
7.2.10

Changing the direction of rotation without changing the setpoint

Features
● Not change to the speed setpoint and actual value, the torque setpoint and actual value
● Only possible when the pulses are inhibited
Note
If one of the p1959.14/15 options (positive/negative direction of rotation permitted) is
selected in parameter p1959, this will affect the direction of rotation when p1821 (sense of
rotation) is set as follows:
If p1821 = 0 or 1, positive direction of rotation (p1959.14 =1) means: clockwise or counter-
clockwise direction respectively.
If p1821 = 1 or 0, negative direction of rotation (p1959.15 =1) means: counter-clockwise or
clockwise direction respectively.
Description
The direction of rotation of the motor can be reversed using the rotational direction change
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 rotational direction change via p1821 can be detected as a result of the direction of
rotation of the motor. The speed setpoint and actual value, torque setpoint and actual value
and also the relative position change remain unchanged.
The rotational direction change can be identified as a result of the phase voltage. Similarly,
when the rotational direction changes, the absolute position reference is also lost.
Overview of important parameters (see SINAMICS S110 List Manual)
● r0069 Phase current, actual value
● p1821 Rotational direction
● p1959[0...n] Rotating measurement configuration
● p2507 LR absolute encoder adjustment status
192
and the relative position change.
CAUTION
If a change of rotational direction 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 must be reset each time the
system boots or when the rotational direction changes (p2507), as the position
reference is lost when the rotational direction changes.
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions