HEIDENHAIN iTNC 530 Service Manual page 312

With axes with 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 with master-slave torque control" on page 18
– 314.
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
axis can also be operated with only one drive ("service function", e.g., a portal is only moved with
one drive).
Preliminary
action
For traverse with indirect position measurement the line count of the encoder must be known.
Line count of the
motor encoder
The motor table contains this information:
18 – 312
Note
Please clarify with the machine tool builder, whether the axis concerned is operated as
individual axis, with master-slave torque control, as gantry axis or gantry axis with master-
slave torque control!
A defective scale or scanning head or a defective encoder cable could influence the low
voltages of the control. This could affect the overall function!
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 (not in the original MP list)!
You may have to expand the traverse range limits.
This is done in the machine parameters MP 910.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.
Call the machine parameter list.
Place the cursor on MP 2200.x for the motor concerned.
Switch to the next soft-key row.
Press the soft key with the motor symbol.
Now press the SHOW ACTIVE VALUE soft key.
Press the right arrow key until the cursor is in the STR column.
Read the line count of the encoder (e.g. 2048).
HEIDENHAIN Service Manual iTNC 530