Autophasing For Permanent Magnet Synchronous Motors - ABB ACL30 User Manual

Autophasing for permanent magnet synchronous motors

Note: Autophasing must be performed before the lift is in operation. Otherwise
uncontrolled movement of the lift can occur.
Autophasing is an automatic measurement routine to determine the angular position
of the magnetic flux of a permanent magnet synchronous motor. The angular position
of the magnetic flux is required to control the motor torque accurately.
Sensors like absolute encoders and resolvers indicate the position of the magnetic
flux at all times after autophasing is performed. A standard pulse encoder determines
the rotor position only when it rotates. This requires a new autophasing at every
power-up.
Rotor
Note: Autophasing is not required if the angle of magnetic flux is known and/or stored
in the encoder memory (EnDat or Hiperface).
• If the angle is known, example, marked to motor name plate, it can be set
manually with parameter
parameters 97.01
SRC = Drive mem.
• If the angle offset is stored in the encoder memory, it can be read by setting
parameter 99.12
must be triggered by selecting the parameter
Autophasing is performed with permanent magnet synchronous motors in the
following cases:
• One-time measurement when an absolute encoder or resolver is used
• At every power-up when an incremental encoder is used
N
S
97.17 POS OFFSET USER. It is also needed to set
USE GIVEN PARAMS = UserPosOffs and
POS OFFSET SRC = Encoder mem. The reading from encoder
Program features 167
Absolute encoder/resolver
99.12
90.06 ENC PAR REFRESH.
POS OFFSET