Mitsubishi Electric LD77MH, User Manual

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Chapter 5 Synchronous Control Initial Position
Example) When "[Cd.617] Cam position calculation: Cam axis current value per cycle" is
corresponding to the 3rd point of cam data
0
(Cam reference position)
1
Cam axis length per cycle [Cam axis cycle units]
At the 1st point
At the 4th point
(1) (2) (3)
2
3
Search starting point
At the 0th point
Search order
At the 3rd point
At the 2nd point
At the 5th point [Cd.617] Cam position calculation:
Cam axis current value
per cycle
• Searches in order of the cam data between the 3rd point and the 4th point and between
the 4th point and the 5th point (last point).
• If the corresponding position is not found until the last point of the cam data, searches
from the 1st point of the cam data.
• If the corresponding position is not found in the cam data between the 1st point and the
2nd point and between the 2nd point and the 3rd point, searches from the range of (3).
(3) The range from the last point of cam data to the cam axis length per
cycle
When "the last point of cam data

[Cd.617] Cam position calculation: Cam axis
current value per cycle < cam axis length per cycle", the position corresponding to
"[Cd.618] Cam position calculation: Cam axis feed current value" is searched from
the last point of the cam data or later.
If the corresponding position is not found even though the range of (3) has been
searched, the warning "Cam position calculation cam axis 1 cycle current value
calculation disable" (warning code: 834) will occur in reciprocated cam pattern.
For the feed cam, calculates "[Cd.618] Cam position calculation: Cam axis feed
current value" by the stroke difference and searches again from the 0th point to the
whole range. If the corresponding position is not found even though the search
process starts again, the warning "Cam position calculation cam axis 1 cycle
current value calculation disable" (warning code: 834) will occur.