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Field orientation
6 – 470
If a synchronous spindle is used and an encoder without Z1 track or a
nonaligned encoder with EnDat interface, there is no assignment between the
encoder and rotor magnets.
With the FIELD ORIENTATION function, the LE 426 M/30 000 rpm or the
LE 430 M automatically determine the assignment between the encoder and
the rotor magnets (field angle) during commissioning and save this information
on the hard disk.
Encoder with EnDat interface
As soon as the absolute position of
the encoder has been read, the
assignment between absolute
position and field angle is determined
from the file.
7 7 7 7
Switch on the control.
7 7 7 7
Do not acknowledge the Power Interrupted message. In the Programming
and Editing mode of operation, use the MOD key to enter the code number
688379.
7 7 7 7
Press the I CONTROL soft key.
7 7 7 7
Acknowledge the Power Interrupted message.
7 7 7 7
Press the SELECT AXES soft key.
7 7 7 7
Press the SPINDLE soft key.
7 7 7 7
Press the FIELD ORIENT. soft key.
The PLC must
• switch the drive on/off.
• release and lock the brakes
The spindle rotates with rated speed for the duration of approx. 2 s. During this
period the field angle at the reference mark or datum is determined and
automatically saved in a file on the hard disk.
7 7 7 7
Press the END soft key.
The control carries out a reset. Then the assignment of the field angle is
available.
If an encoder with EnDat interface is used, the field angle is assigned to the
zero position of the encoder.
If an encoder without Z1 track is used, the spindle is first roughly oriented after
it has been started. Then the field angle can be assigned to the reference mark
and the spindle starts, taking the field angle into account.
Encoder without Z1 track
After the drive has been switched on,
the spindle is oriented automatically.
Following that, the drive is ready for
operation. As soon as the reference
mark is traversed during the first
movement of the spindle, the
assignment of the field angle is
determined from the file.
HEIDENHAIN Technical Manual TNC 426, TNC 430
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