Cam Axis Command Position Value Restoration - Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual

Cam axis command position value restoration

If "[Pr.462] Cam axis position restoration object" is set to "2: Cam axis command position value restoration" when starting
synchronous control, the cam axis command position value is restored based on the cam axis position value per cycle and the
cam reference position.
Select the method for the cam axis position value per cycle and the method for the cam reference position to be restored.
[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
[Pr.463] Setting method of cam reference position
0: Previous value
1: Initial setting value of cam
reference position
2: Command position value
Cam axis position value per cycle
Cam axis command position value
Cam reference position
The cam axis command position value moves to its restored value just after starting synchronous control
when the cam axis command position value to be restored is different from the command position value at
synchronous control start.
If the difference between the restored cam axis command position value and command position value is larger
than "In-position width (PA10)" of servo parameter in pulse command units at the synchronous control start,
"Cam axis command position value restoration disable" (error code: 1E79H) will occur and synchronous
control cannot be started.
Note that, if the setting value of "In-position width" is large, a rapid operation may occur.
With cam axis command position value restoration, calculate the cam axis command position value with the
cam position calculation function (Page 159 Cam Position Calculation Function) or with synchronous
control analysis mode (Page 157 Synchronous Control Analysis Mode) before starting synchronous
control. Then start synchronous control after positioning to the correct cam axis command position value.
5 ADVANCED SYNCHRONOUS CONTROL INITIAL POSITION
154
5.3 Cam Axis Position Restoration Method
[Md.407] Cam axis position
value per cycle
[Md.408] Cam reference
position
The cam axis command position value is restored
based on the cam axis position value per
cycle and the cam reference position.
[Md.409] Cam axis command position value