Mitsubishi Electric LD77MH, User Manual

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Chapter 3 Cam Function
Cam data starting point
This setting is only valid for cam data using the stroke ratio data format.
The cam data point corresponding to "Cam axis current value per cycle = 0" can be set as
the cam data starting point.
The default value of the cam data starting point is 0. (The cam axis is controlled with cam
data starting from the 0th point (stroke ratio 0%).)
When a value other than 0 is set for the cam data starting point, cam control is started from
the point where the stroke ratio is not 0%.
The cam data starting point is set for each cam data. The setting range is from 0 to (cam
resolution - 1).
t
t
Cam axis current
value per cycle
Feed current value
Cam reference
position
(At 1st cycle)
At last point At 0th point
Cam data
starting point
Cam reference
position
(At 3rd cycle) Cam reference
position
(At 2nd cycle)
Timing of applying cam control data
(1) Stroke ratio data format
If "[Pr.440] Cam No." or "[Pr.441] Cam stroke amount" is changed during synchronous
control, the new value is accepted and applied when the cam axis current value per
cycle passes through the 0th point of cam data, or is on the 0th point.
The cam reference position is updated when the cam axis current value per cycle
passes through the 0th point of cam data.
(2) Coordinate data format
If "[Pr.440] Cam No." is changed during synchronous control, the new value is
accepted and applied when the cam axis current value per cycle passes through 0, or
is on 0.
The cam reference position is updated when the cam axis current value per cycle
passes through 0.