946 HEIDENHAIN Technical Manual iTNC 530 HSCI
If MP3143 = 2, then a signal at X9 pin 14b is used to enable the reference
pulse for the spindle position encoder. This ensures that the same reference
mark of the encoder is always evaluated. As soon as a reference mark of the
encoder is traversed, the pulses are counted and immediately after the switch
is scanned the "correct" reference mark is calculated. This might mean that the
spindle is no longer moved after the switch is scanned.
The signal must be available for at least as long as the position controller cycle
time + 2 ms. This means that the maximum speed for detecting the signal is:
s: Trigger window of the switch (10° in the example)
t
Pos.
: Position controller cycle time
The example results in a maximum speed of:
n
max
s 60000⋅
360 t
Pos.
2 ms+()⋅
-----------------------------------------
=
n
max
10° 60000 ms/min⋅
360° 3 ms 2 ms+()⋅
---------------------------------------------
333 min
–1
==
20°
40°
60°
0°
Motor Spindle
20 : 17
Ref 0
0°
10°
20°
Switch
Trigger signal
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