3 – 670 HEIDENHAIN Service Manual iTNC 530
3.3.5 Positioning window
The positioning window defines the limits within which the control considers a position to have
been reached. After the position has been reached, the control begins running the next block.
The position controller can correct a disturbance inside this window without activating the
“Return to the Contour” function.
8 The size of the positioning window is defined in MP1030.x.
MP1030.x Positioning window
Input: 0.0001 to 2.0000 [mm]
Possible
error
The NC program gets caught up in an NC block.
Possible
causes of error
The list does not claim to be complete; ask your machine tool builder!
You may add your own experiences!
Excessive static and sliding friction ("slip & stick")
Chip in the thread during tapping, thread milling or forming (The spindle "vibrates" to the left
and right without leaving the hole.)
Analog axes: Excessive drift
Digital axes: Insufficient controller adjustment (The axis "oscillates" and "jitters" around the
positioning window.)
Missing acknowledgment of M, S, T, G, Q strobe signals (strobe acknowledgments, PLC)
Defective motor coil: No exact positioning can be performed at this place.
Test for
troubleshooting
Slightly increase the value for the positioning window and observe the machine behavior.
Restore the original value afterwards.
Axes in position Once the axes have moved into the positioning window, the corresponding bits are set in
W1026. This also applies to the status after the machine control voltage is switched on. Axes
that are not used are considered to be in position.
The NC resets the bits as soon as you start a positioning movement or traverse the reference
marks.
In the Electronic Handwheel mode of operation the bit for the current handwheel axis is reset.
W1026 is not set for contours that can be machined with constant surface speed.
Set Reset
W1026 Axes in position
Bits 0 to 8 represent axes 1 to 9
0: Axis not in positioning window
1: Axis in positioning window
NC NC
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