ABB ACS280, Руководство по прошивке, Страница: 46 / 430

46 Program features

Autophasing
Autophasing is an automatic measurement routine to determine the angular
position of the magnetic flux of a permanent magnet synchronous motor. The
motor control requires the absolute position of the rotor flux in order to control
motor torque accurately.
The autophasing routine is performed at every start.
Note: The motor may turns when it is started as the shaft is turned towards the
remanence flux.
Bit 4 of
06.21 Drive status word 3 indicates if the rotor position has already been
determined.
Autophasing modes
Several autophasing modes are available in the drive (see parameter 21.13
Autophasing mode
).
The turning mode ( Turning ) is the most robust and accurate method. In turning
mode, the motor shaft is turned back and forward(±360/polepairs)° in order to
determine the rotor position. In turning 2 mode ( Turning 2 ), the shaft is turned
only in one direction and the angle is smaller.
The standstill mode (
Standstill ) can be used if the motor cannot be turned (for
example when load is connected). For SynRM, PMaSynRM, and IPM motors the
standstill autophasing time is usually less than 1 second. For surface mounted
PM motors, autophasing time is longer (1-2 seconds). Also, for this kind of
motor, pulsating torque up to nominal torque is produced, which may cause
some noise.
The drive is capable of determining the rotor position when started into a
running motor.In this situation, the setting of
21.13 Autophasing mode
has no
effect.
An autophasing fault (
3385 Autophasing
) could be caused by, for example, the
following:
• The motor is already turning before the autophasing routine is started
• The motor shaft is locked
•
Turning mode is selected in 21.13 Autophasing mode but the motor shaft is
locked
• The wrong motor type is selected in
99.03 Motor type
• Motor ID run has failed.
Settings and diagnostics
Parameters
06.21 Drive status word 3
and
99.13 ID run requested
.
Events: -