Cam Reference Position Restoration - Mitsubishi Electric MELSEC iQ-R Series User Manual

Cam reference position restoration

If "[Pr.462] Cam axis position restoration object" is set to "1: cam reference position restoration" when starting synchronous
control, the cam reference position is restored based on the cam axis position value per cycle and the cam axis command
position value.
Select the method for the cam axis position value per cycle to be restored. The command position value when starting
synchronous control is used as the cam axis command position value.
[Pr.464] Setting method of cam axis
position value per cycle
0: Previous value
1: Initial setting value of cam axis
position value per cycle
2: Position value per cycle after
main shaft gear
3: Position value per cycle after
auxiliary shaft gear
[Md.20] Command position value
(At synchronous control start)
Cam axis position value per cycle
Cam axis command position value
Cam reference position
Example
The following shows an example of starting operation from a position of "cam axis position value per cycle=0" by restoring the
cam reference position when starting from "command position value=0 [pulse]", in the cam when the cam data starting point is
not 0.
Setting item
[Pr.439] Cam axis length per cycle
[Pr.441] Cam stroke amount
[Pr.462] Cam axis position restoration object
[Pr.463] Setting method of cam reference position
[Pr.464] Setting method of cam axis position value per cycle
[Pr.467] Cam reference position (Initial setting)
[Pr.468] Cam axis position value per cycle (Initial setting)
• Operation before starting advanced synchronous control
Command position value [pulse]
"Command position value = 0"
due to home position return, etc.
0
5 ADVANCED SYNCHRONOUS CONTROL INITIAL POSITION
156
5.3 Cam Axis Position Restoration Method
[Md.407] Cam axis command
[Md.409] Cam axis command
Restored by the equation of "Command position value - Cam axis position value per cycle"
(200 [pulse])
Time [ms]
value per cycle
position value
Stroke ratio [%]
Cam pattern for "cam data
starting point setting = 200 [pulse]"
100
0 1000
The cam reference position is restored
based on the cam axis position value per
cycle and the cam axis command position value.
[Md.408] Cam reference position
Setting value
1000 [pulse]
200 [pulse]
1: Cam reference position restoration
None
1: Initial setting value of cam axis position value per cycle
None
0 [pulse]
Cam axis length per cycle [pulse]