
4. REFERENCE POSITION ESTABLISHMENT
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By reversing the formula above, the following formula gives the feedrate
F needed to set the servo position error to 128 when the servo loop gain
G is 30 s
–1
and the detection unit U is 1 mm:
F=
128 60
1000
30
= 230 [mm/min]
Therefore, when the servo loop gain is 30 s
–1
, the detection unit is 1 mm,
and parameter No. 1836 is set to 128, the tool must be fed in the reference
position return direction at a speed of at least 230 mm/min before manual
reference position return.
The grid can be shifted by the distance set in parameter 1850, thus shifting
the reference position. The grid shift to be set in the parameter must not
exceed the reference counter capacity (parameter No. 1821) (grid
interval).
[Classification] Input signal
[Function] This signal selects manual reference position return. Manual reference
position return is a kind of jog feed. Therefor, to select manual reference
position return, it is required that the jog mode be selected and that the
manual reference position return selection signal be set to “1”.
[Operation] When the manual reference position return selection signal is set to “1”,
the control unit becomes as described below.
D If jog feed mode is not selected, the control unit ignores the manual
reference position return selection signal.
D If jog mode is selected, manual reference position return is enabled.
In this case, manual reference position return selection check signal
MZRN turns to “1”.
NOTE
If the ZRN status changes from “0” to “1” or “1” to “0” during
jog feed, the feedrate is decelerated to 0. Then, to make
reference position return or jog feed, turn feed axis and
direction selection signal to “0” then set it to “1”.
Grid shift
Signal
Manual reference
position return selection
signal ZRN <G043#7>