Mitsubishi Electric MELSEC iQ-R RD78G4 - Cam Reference Position Restoration

152
5 ADVANCED SYNCHRONOUS CONTROL INITIAL POSITION
5.3 Cam Axis Position Restoration Method
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.
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.
• Operation before starting advanced synchronous control
Setting item Setting value
[Pr.439] Cam axis length per cycle 1000[pulse]
[Pr.441] Cam stroke amount 200[pulse]
[Pr.462] Cam axis position restoration object 1: Cam reference position restoration
[Pr.463] Setting method of cam reference position None
[Pr.464] Setting method of cam axis position value per cycle 1: Initial setting value of cam axis position value per cycle
[Pr.467] Cam reference position (Initial setting) None
[Pr.468] Cam axis position value per cycle (Initial setting) 0[pulse]
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.407] Cam axis position
value per cycle
[Pr.464] Setting method of cam axis position value per cycle
[Md.409] Cam axis
command position value
The cam reference position is restored
based on the cam axis position value per
cycle and the cam axis command position value.
[Md.20] Command position value
(At synchronous control start)
[Md.408] Cam reference position
Cam axis command position value
Cam axis
position value per cycle
Cam reference position
Restored by the equation of "
Command position value - Cam axis position value per cycle"
0 1000
Stroke ratio[%]
Cam axis length per cycle[pulse]
100
(200 [pulse])
Cam pattern for "cam data
starting point setting = 200[pulse]"
"Command position value = 0"
due to home position return, etc.
0
Command position value[pulse]
Time[ms]