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12 CONTROL AUXILIARY FUNCTIONS
(b) Zero point shift operation at the "
Pr.49 Creep speed"
(When "
Pr.57 Speed designation during zero point shift" is 1)
When the " Pr. 55 Zero point
shift amount" is negative
When the " Pr. 55 Zero point
shift amount" is positive
Pr. 46 Zero point
return direction
Zero point
Machine zero point
return start
Near-point dog
Zero point signal
Zero point
Pr. 49 Creep speed
Fig. 12.7 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 complete flag (RX(n+2)0, RX(n+5)0)
Current feed value (RWrn+0 to 1, RWrn+8 to 9)
Md.30 Machine feed value
Axis operation status (RWrn+7, RWrn+15)
Md.44 Movement amount after near-point dog ON (" Pr.55 Zero point shift
amount" is not added.)
The zero point return request flag (RX(n+1)F, RX(n+4)F) is reset after zero point
shift completion.
(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 D75P2.
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 remote station READY signal [RX(n+7)B].
Setting item
Setting
value
Setting details
Factory-set
initial value
Pr.55
Zero point shift
amount
Set the shift amount during the zero point shift. 0
Pr.57
Speed
designation
during zero point
shift
Select the speed during the zero point shift
0:
Pr.48 Zero point return speed
1:
Pr.49 Creep speed
0
* Refer to section "5.2 List of parameters" for setting details.
REMARK
Parameters are set for each axis.