ABB DSTD108 Connection Unit brand

When the off-line mode is used with a drive(s) connection, the user can

• connect the selected drive to DriveSPC.

• upload an application program from the connected drive (an empty template

which includes only the firmware blocks is available by default.)

• download the configured application program to the drive and start the program

execution. The downloaded program contains the function block program and the

parameter values set in DriveSPC.

• remove the program from the connected drive.

On-line

In the on-line mode, the user can

• modify firmware parameters (changes are stored directly to the drive memory)

• modify application program parameters (ie, parameters created in DriveSPC)

• monitor the actual values of all function blocks in real time.

Autophasing

Autophasing is an automatic measurement routine to determine the angular position

of the magnetic flux of a permanent magnet synchronous motor or the magnetic axis

of a synchronous reluctance motor. The motor control requires the absolute position

of the rotor flux to control the motor torque accurately.

Sensors like absolute encoders and resolvers indicate the rotor position at all times

after the offset between the zero angle of rotor and that of the sensor has been

established. On the other hand, a standard pulse encoder determines the rotor

position when it rotates but the initial position is not known. However, a pulse

encoder can be used as an absolute encoder if it is equipped with Hall sensors,

albeit with coarse initial position accuracy. The Hall sensors generate so-called

commutation pulses that change their state six times during one revolution, so it is

only known within which 60° sector of a complete revolution the initial position is.