
OPERATION
B–63444EN/01
6. SAFETY FUNCTIONS
261
Area which the tool cannot enter can be specified with stored stroke limit
1.
(I,K)
:Forbidden area for the tool
(X,Z)
Fig.6.3 Stroke check
When the tool exceeds a stored stroke limit, an alarm is displayed and the
tool is decelerated and stopped.
When the tool enters a forbidden area and an alarm is generated, the tool
can be moved in the reverse direction from which the tool came.
Parameters (Nos. 1320, 1321) set boundary. Outside the area of the set
limits is a forbidden area. The machine tool builder usually sets this area
as the maximum stroke.
Unnecessary limits should be set beyond the machine stroke.
The LZR parameter (No. 1300#6) can be used for each limit to specify
whether to enable the stroke limit immediately after power is turned on
or after a return to the reference point is made manually or with G28.
After the power is turned on, if the reference position is in the forbidden
area of each limit, an alarm is generated immediately.
If the tool has already entered a forbidden area when reference position
return is performed, an alarm is issued, preventing the tool from being
moved out of that area. In such a case, check the set value and, if
erroneous, correct it. Then, retry from reference position return.
NOTE
In setting a forbidden area, if the two points to be set are
the same, the area is as follows:
· All areas are forbidden areas.
Parameter BFA (bit 7 of No. 1300) selects whether an alarm is displayed
immediately before the tool enters the forbidden area or immediately after
the tool has entered the forbidden area.
Number Message Contents
500 OVER TRAVEL:
+n
The n–th axis (1–2) exceeded + side stored
stroke limit.
501 OVER TRAVEL:
–n
The n–th axis (1–2) exceeded*side stored
stroke limit.
6.3
STROKE CHECK
Explanation
D Stored stroke limit
D Effective time for a
forbidden area
D Releasing the alarms
D Timing for displaying
an alarm
Alarms