Sub Functions Specifically For Machine Home Position Return; Home Position Return Retry Function - Mitsubishi Electric RD77MS2 User Manual

8.2
Sub Functions Specifically for Machine Home
Position Return
The sub functions specifically for machine home position return include the "home position return retry function" and "home
position shift function". Each function is executed by parameter setting.

Home position return retry function

When the workpiece goes past the home position without stopping during positioning control, it may not move back in the
direction of the home position although a machine home position return is commanded, depending on the workpiece position.
This normally means the workpiece has to be moved to a position before the near-point dog by a JOG operation, etc., to start
the machine home position return again. However, by using the home position return retry function, a machine home position
return can be carried out regardless of the workpiece position.
Control details
The following drawing shows the operation of the home position return retry function.
■Home position return retry point return retry operation when the workpiece is within the range
between the upper and lower limits.
5.
4.
ON
Near-point dog
Zero signal
1.
The movement starts in the "[Pr.44] Home position return direction" by a machine home position return start.
2.
The operation decelerates when the limit signal OFF is detected.
3.
After stopping due to the limit signal OFF detection, the operation moves at the "[Pr.46] Home position return speed" in
the opposite direction of the "[Pr.44] Home position return direction".
4.
The operation decelerates when the near-point dog turns OFF.
5.
After stopping due to the near-point dog OFF, a machine home position return is carried out in the "[Pr.44] Home position
return direction".
6.
Machine home position return completion
2.
1.
6.
Limit signal OFF
Hardware limit switch

8.2 Sub Functions Specifically for Machine Home Position Return

3.
8 CONTROL SUB FUNCTIONS
8
217