Autophasing - ABB ACS280 Firmware Manual

46 Program features
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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.
06.21 Drive status word 3
Bit 4 of
determined.
Autophasing modes
Several autophasing modes are available in the drive (see parameter
Autophasing mode
The turning mode (
mode, the motor shaft is turned back and forward(±360/polepairs)° in order to
determine the rotor position. In turning 2 mode (
only in one direction and the angle is smaller.
The standstill mode (
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
effect.
An autophasing fault (
following:
• The motor is already turning before the autophasing routine is started
• The motor shaft is locked
Turning
• mode is selected in
locked
• The wrong motor type is selected in
• Motor ID run has failed.
Settings and diagnostics
06.21 Drive status word 3
Parameters
Events: -
indicates if the rotor position has already been
).
Turning
) is the most robust and accurate method. In turning
Standstill
) can be used if the motor cannot be turned (for
3385 Autophasing
21.13 Autophasing mode
Turning 2
21.13 Autophasing mode
) could be caused by, for example, the
99.03 Motor type
99.13 ID run requested
and
21.13
), the shaft is turned
has no
but the motor shaft is
.