Mitsubishi A1SD75M3 User Manual page 484

12 CONTROL AUXILIARY FUNCTIONS
Machine zero point
return start
Setting item
Zero point shift
Pr.55
amount
Speed designation
Pr.57 during zero point
shift
* Refer to "5.2 List of parameters" for setting details.
(b) Zero point shift operation at the " Pr.49 Creep speed"
Zero point
Pr.46
return direction
Zero point
Near-point dog
Zero point
Fig. 12.8 Zero point shift operation at the creep speed
(4) Precautions during control
The following data are set after the zero point shift amount is complete.
•
Zero point return request flag ( Md.40 Status: b3)
•
Zero point return complete flag ( Md.40 Status: b4)
•
Md.29 Current feed value
•
Md.30 Machine feed value
•
Md.35 Axis operation status
•
Md.44 Movement amount after near-point dog ON (" Pr.55 Zero point shift
amount" is not added.)
(5) Setting the zero point shift function
To use the "zero point shift function", set the required details in the parameters
shown in the following table, and write them to the AD75.
When the parameters are set, the zero point shift function will be added to the
machine zero point return control. The set details are validated at the rising edge
(OFF ON) of the PLC READY signal (Y1D).
Setting
value
Set the shift amount during the zero point shift.
Select the speed during the zero point shift
REMARK
•
Parameters are set for each axis.
•
It is recommended that the parameters be set whenever possible with the AD75
software package. Execution by sequence program uses many sequence
programs and devices. The execution becomes complicated, and the scan times
will increase.
Pr.49 Creep speed
When the "
shift amount" is negative
Setting details
0: Pr.48 Zero point return speed
1: Pr.49 Creep speed
12 - 12
When the " Pr.55
shift amount" is positive
Zero point
Zero point
Pr.55
MELSEC-A
Zero point
Factory-set
initial value
0
0