Efficient Networks S120 manual Direction reversal without changing the setpoint, Restrictions

Basic functions 6.6 Direction reversal without changing the setpoint

Restrictions

The following restrictions must be taken into account when a dv/dt filter is used:

●The output frequency is limited to a maximum of 150 Hz.

●Maximum permissible motor cable lengths:

–Shielded cables: max. 300 m

–Unshielded cables: max. 450 m

●Other restrictions: see the Equipment Manual.

Commissioning

The dv/dt filter must be activated when commissioning the system (p0230 = 2).

6.6Direction reversal without changing the setpoint

Features

●Not change to the speed setpoint and actual value, the torque setpoint and actual value and the relative position change.

●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.

Drive Functions	187
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4