ABB ACS880 Firmware Manual page 101

The autophasing routine is performed with permanent magnet synchronous motors
and synchronous reluctance motors in the following cases:
1. One-time measurement of the rotor and encoder position difference when an
absolute encoder, a resolver, or an encoder with commutation signals is used
2. At every power-up when an incremental encoder is used
3. With open-loop motor control, repetitive measurement of the rotor position at
every start.
4. When the position of the zero pulse must be measured before the first start after
the power-up.
Note: In closed-loop control, autophasing is performed automatically after the motor
identification run (ID run). Autophasing is also performed automatically before starting
when necessary.
In open-loop control, the zero angle of the rotor is determined before starting. In
closed-loop control, the actual angle of the rotor is determined with autophasing when
the sensor indicates zero angle. The offset of the angle must be determined because
the actual zero angles of the sensor and the rotor do not usually match. The
autophasing mode determines how this operation is done both in open-loop and
closed-loop control.
The rotor position offset used in motor control can also be given by the user – see
parameter 98.15 Position offset
result into this parameter. The results are updated even if user settings are not
enabled by 98.01 User motor model
Note: In open-loop control, the motor always turns when it is started as the shaft is
turned towards the remanence flux.
Autophasing modes
Several autophasing modes are available (see parameter
• The Turning mode is recommended especially with case 1 (see the list above) as
it is the most robust and accurate method. The rotor position is determined by
turning the motor shaft back and forward (±360/pole pair)°. In case 3 (open-loop
control), the shaft is turned only in one direction at smaller angles.
• The Turning with Z-pulse
normal turning mode, for example, in case of significant friction. You must turn the
motor slowly until the encoder detects a zero pulse. When the zero pulse is
detected for the first time, its position is stored into parameter
offset user, which you can edit for fine-tuning. Note that it is not mandatory to use
this mode with a zero pulse encoder. In open-loop control, the two turning modes
are identical.
• The Standstill 1
(for example, when the load is connected). As the characteristics of motors and
loads differ, you must test to know the most suitable standstill mode.
user. Note that the autophasing routine also writes its
mode.
mode can be used when there is a problem using the
and Standstill 2 modes can be used if the motor cannot be turned
Standard program features 101
21.13 Autophasing
98.15 Position
mode).