Direction Reversal - Siemens SINAMICS G130 Operating Instructions Manual

9.2.15

Direction reversal

Description
The direction of rotation of the motor can be reversed using direction reversal via p1821
without having to change the motor rotating field by interchanging two phases on the motor
and inverting the encoder signals using p0410.
Reversal via p1821 can be detected from the motor direction of rotation. The speed setpoint
and actual value, torque setpoint and actual value remain unchanged, as does the relative
position change.
A pulse inhibit must be set prior to attempting reversal.
Direction reversal can be set differently for each drive data set.
Note
Drive data set changeover with differently set direction reversal
When changing over the drive data set to differently set reversing and with pulse approval,
fault F7434 is issued.
Reversing can be observed by checking parameters r0069 (phase currents) and r0089
(phase voltage). The absolute position reference is lost on reversal.
The output direction of rotation of the converter can be additionally 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.
NOTICE
Material damage when the drive undesirably accelerates 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
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A
its polarity when reversing the direction of rotation (p1821 = 1).
Functions, monitoring, and protective functions
9.2 Drive functions
419