Field Orientation - HEIDENHAIN iTNC 530 HSCI Technical Manual

6.14.2 Field orientation

Field orientation
with absolute
encoder (EnDat)
Field orientation via
encoder with Z1
track
Field orientation via
the PLC
July 2013
As soon as the absolute position of the encoder has been read, the absolute
position and determined field angle are assigned to each other.
The field angle is assigned to the zero position of the encoder.
After switching on the control, the motor orients itself (rough orientation) via
the Z1 track of the encoder. The drive is ready for operation after this
procedure. The field angle is determined and assigned as soon as the
reference mark is traversed during the first motor motion.
If a synchronous drive is used along with an encoder, and the field angle
cannot be determined directly via the encoder, there is no assignment
between the encoder and rotor magnets.
The Field Orientation function, which must be carried out once per switch-on
procedure, is used by the iTNC 530 to determine the association between the
encoder and rotor magnets (field angle), and stores this information internally.
Note
Please pay attention to the following notes for determining the field angle:
HEIDENHAIN generally recommends using either encoders with

absolute values or encoders with Z1 tracks. With these encoders the field
angles are available immediately after switch-on, so no additional efforts
are necessary to determine them.
The field angle can be determined only if the current controller is already

adjusted!
Regarding the motor.mot motor table, the field orientation must be performed
for the following drives:
Linear motor with absolute encoder with EnDat interface (SYS = 3)

Synchronous or torque motor with non-aligned rotary encoder with EnDat

interface (SYS = 5)
Synchronous or torque motor with incremental rotary encoder without Z1

track (SYS = 6); one reference mark per revolution
Synchronous or torque motor with incremental rotary encoder with

distance-coded reference marks (SYS = 7)
Linear motor with incremental linear encoder with distance-coded reference

marks (SYS = 8)
Methods of the iTNC for determining the field angle
The description of the field angles by the iTNC 530 HSCI, see "Field
orientation" on page 1108.
6.14 Commissioning
1019