4. REFERENCE POSITION ESTABLISHMENT
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(1)When the reference position is not established and the axis moved by
turning the feed axis direction signal (+J1,–J1,+J2,–J2,...) to ”1” in
REF mode, the reference position establishment procedure is executed.
(2)When the reference position is already established and the axis is
moved by turning the feed axis direction signal (+J1,–J1,+J2,–J2,...)
to ”1” in REF mode, the axis is moved to the reference point without
executing the reference position establishment procedure.
(3)When the reference position is not established and the reference
position return command (G28) is executed, the reference position
establishment procedure is executed. The next movement the axis
depends on the setting of PRM No.1818#0(RFS).
(4)When the reference position is already established and the reference
position command (G28) is executed, the movement of the axis
depends on the setting of PRM No.1818#1(RF2).
(1)When the Linear scale with distance–coded reference marks (serial) is
used, please don’t forget to set parameter No.1818#3(NSD) to 1. And
distance coded rotary encoder (serial type) is unavailable.
(2)On the Linear scale with distance–coded reference marks (serial), the
axis does not stop until three reference marks are detected. If this
procedure is started at the position near the scale end, CNC can not
detect three reference marks and the axis does not stop until over travel
alarm occurs. Please care to start at the position that has enough
distance from scale end.
And if establishment of reference position is failed, the establishment
is retried. Then axis does not stop until still more three reference marks
are detected. So please set the maximum move amount (detection unit:
Prm. No.14010) not to reach the scale end.
Scale end
Reference mark
Start point (Bad)
Start point (Good)
F
f
d
(3)There are the following limitations when the angular axis control is
used.
(a) It is necessary to use the Linear scale with distance–coded
reference marks (serial) for both the perpendicular axis and the
angular axis. If not, P/S 5328 occurs when reference position
establishment is tried.
(b)When the reference point establishment of angular and
perpendicular axes are tried, please set parameter 8200#2(AZR) to
’0’ and input signal G063#5(NOZAGC) to ’0’. If not, P/S 5328
occurs when reference position establishment is commanded.
(c) When the reference point of the perpendicular axis is established,
it is necessary to establish the reference point of the angular axis
previously. When the reference point of the angular axis is not
previously established, the P/S090 alarm is generated.
Reference position
return
Note