Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual page 81

■Auto-generation data format
A cam pattern is created based on the specified parameter (data for auto-generation). Control cam data is created in the
stroke ratio data format in the cam open area. Therefore, the operation specification during the control conforms to the cam
operation in the stroke ratio data format.
The types of cam patterns for auto-generation data format are as follows.
Auto-generation type
Cam for rotary cutter
CAUTION
• If the cam data is set incorrectly, similarly to the incorrect setting of a target value and command speed in the positioning control, the position and speed
command to the servo amplifier increases, and may cause machine interface and servo alarms such as "Overspeed" and "Command frequency error". When
creating and changing cam data, execute a trial operation and provide the appropriate adjustments. Refer to the following for precautions on test operations
and adjustments. (SAFETY PRECAUTIONS)
Command position value of cam axis
The command position value is calculated as shown below.
■Stroke ratio data format
Command position value = Cam reference position + (Cam stroke amount  Stroke ratio corresponding to cam axis position
value per cycle)
■Coordinate data format
Command position value = Cam reference position + Output value corresponding to cam axis position value per cycle
When the cam axis position value per cycle is in the middle of the defined cam data (Stroke ratio data/Coordinate data), the
value is calculated from the nearest cam data.
Cam axis position
value per cycle
Cam data
1 resolution or between 2 coordinates
Features
The cam pattern for a rotary cutter can be created easily.
Calculate the middle value
from the nearest cam data.
3 CAM FUNCTION
3.1 Control Details for Cam Function
3
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