Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual page 151

• The search fails. (Pattern 2)
When the cam axis position value per cycle restoration is executed in a cam stroke range that straddles 0[degree]
Cam axis position value per cycle
360degree
180degree
Cam reference position
Cam axis command position value
(Command position value)
-180degree
Restore the position value within the cam stroke range of 0 to less than 360[degree].
Cam axis position value per cycle
360degree
180degree
Cam axis command position value
(Command position value)
Cam reference position
■With a feed operation cam pattern
• Search from "Cam axis position value per cycle = 0". (Cam data starting point = 0)
Cam axis position value per cycle
Cam axis command position value
(Command position value)
Cam reference position
• Search from a value in the middle of the cam axis position value per cycle. (Cam data starting point = 0)
Cam axis position value per cycle
Cam axis command position value
(Command position value)
New cam reference position
current value
Cam reference position
at the start of restoration
0
Cam stroke range
Cam stroke range
0
[Pr.468] Cam axis position value per cycle (Initial setting)
Update the cam reference position
in the next cycle automatically.
When the cam stroke range straddles 0
degrees and the unit is degree,
"Cam axis position value per cycle restoration
disable" (error code: 1E78H) occurs since
the command position value is within the
range of 0 to 359.99999 and the cam axis
position value per cycle is restored as the
dotted line position.
Search from "Cam axis position value per cycle=0".
Restored to the first command position value that matches.
(Other values are not restored.)
Search from the value in the middle
and restore to the first command position
value that matches in the next cycle.
5 ADVANCED SYNCHRONOUS CONTROL INITIAL POSITION
5.3 Cam Axis Position Restoration Method
5
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