HEIDENHAIN iTNC 530 HSCI - Position measurement via motor encoder (indirect position measurement)

19 – 318 HEIDENHAIN Service Manual iTNC 530 HSCI
With axes in master-slave torque control, two motors (master and slave) are mechanically coupled.
Because of the coupling, only one position encoder is required for the master. The motor to which the
position encoder is assigned is the master.
If the position encoder is defective or shall be examined, in principle the proceeding is the same as
with a single axis. --> See ”Flowchart for axes in master-slave torque control” on page 19 – 320.
With gantry axes (synchronized axes) normally two position encoders are used. If a position
encoder is defective or is to be inspected, ask the machine manufacturer whether the gantry axes can
also be operated with one drive ("service function", e.g., the portal is moved by one drive only).
Preparations  A defective scale or scanning head or a defective encoder cable could influence the low voltages
of the control. This could impair the overall function.
Therefore, switch off the machine and separate the position encoder from the control!
 The changes to the machine parameter list are quite extensive.
Proposal:
Copy the original MP list and name the copy, e.g., Motor encoder X.MP.
Activate this list and make your changes there (not in the original MP list)!
 You may have to expand the traverse range limits.
This is done in the machine parameters MP910.x and following.
The traverse range limits set by the machine operator can be called and expanded via the MOD key
and the TRAVERSE RANGE soft key.
Line count of the
motor encoder
For traverse with indirect position measurement the line count of the encoder must be known.
The motor table contains this information:
8 Call the machine parameter list.
8 Place the cursor on MP2200.x for the motor concerned.
8 Switch to the next soft-key row.
8 Press the soft key with the motor symbol.
8 Press the SHOW ACTUAL VALUE soft key.
8 Press the right arrow key until the cursor is in the STR column.
8 Read the line count of the encoder (e.g. 2048).
Note
Please clarify with the machine tool builder, whether the axis concerned is operated as individual
axis, with master-slave torque control, with gantry axes or gantry axes with master-slave torque
control.