18 – 306 HEIDENHAIN Service Manual iTNC 530
18.2.9 Resetting the machine datum
If an axis motor was replaced whose motor encoder is used for position capture (indirect path
measurement), the machine datum (machine reference) may have to be reset.
The procedure for restoring the machine datum when using indirect encoders is the same as
with direct encoders. --> See “Resetting the machine datum” on page 18 – 288.
Special case: Double reference run
(If you have exchanged a motor with an EnDat encoder which is used for the first rough
reference run. No changes have been made to the position encoder!)
General procedure:
8 Reset MP 1355.x for the respective axis to 1 (= double reference run) and MP 1356.x (distance
between speed and position encoder for double reference run) to 0.
8 Reboot the control.
8 Confirm the position report of the EnDat motor encoder.
8 You may have to expand the traverse range.
8 Move slowly and carefully over the reference mark of the position encoder.
8 Now the message Set MP 1356.x to <value> appears.
8 Note down this value.
8 Enter this value in MP 1356.x.
8 Reset the traverse range to the original value.
8 Test the entire reference run of the machine again!
Further information --> See “Reference Run” on page 19 – 317.
18.2.10 Restoring the spindle orientation
If you have replaced a motor encoder used for oriented spindle stop (e.g. for tool change), you
must now readjust the spindle preset.
The procedure for restoring the spindle orientation when using motor encoders is the same as
with angle encoders. --> See “Restoring the spindle orientation” on page 18 – 292.
Ask the machine manufacturer for the reason why a double reference run of the machine
axis was configured! It is possible that the double reference run is used for avoiding a
collision. Follow the instructions of the machine manufacturer for readjusting the double
reference run!
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