Field Orientation - HEIDENHAIN iTNC 530 Technical Manual

6.14.4 Field Orientation

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.
February 2002
If a synchronous spindle is used along with 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, which must be run once during
commissioning, the iTNC 530 automatically determines the assignment
between the encoder and the rotor magnets (field angle) and saves this
information on the hard disk. Of the FIELD ORIENTATION function is not run,
the following error message appears:
n
Encoder with EnDat interface: 8830 EnDat: no field angle <axis>
n
Encoder without Z1 track: 8820 field angle unknown <axis>
7 Switch on the control.
7
Do not acknowledge the Power Interrupted message. In the Programming
and Editing mode of operation, use the MOD key to enter the coder
number 688379. The oscilloscope is started.
7 Press the I CONTROL soft key.
7 In the Manual mode of operation, acknowledge the Power Interrupted
message.
7 Use the CHOOSE AXIS soft key in the oscilloscope to select the
corresponding axis.
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 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.
Note
If the speed encoder is exchanged, the field orientation function must be
rerun.
Commissioning
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.
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