Mitsubishi A1SD75M1, User Manual

Page: 483 / 746

12 - 11
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
(2) Setting range for the zero point shift amount
Set the zero point shift amount within the range from the detected zero point to
the upper/lower limit switches.
Setting range of the
negative zero point
shift amount
Setting range of the positive zero point shift amount
Address decrease
direction
Upper limit Lower limit
Near-point dog
Pr. 46 Zero point return direction
Zero point
Address increase
direction
Fig. 12.6 Setting range for the zero point shift amount
(3) Movement speed during zero point shift
When using the zero point shift function, the movement speed during the zero
point shift is set in " Pr.57 Speed designation during zero point shift". The
movement speed during the zero point shift is selected from either the " Pr.48
Zero point return speed" or the " Pr.49 Creep speed".
The following drawings show the movement speed during the zero point shift
when a machine zero point return is carried out by the near-point dog method.
(a) Zero point shift operation at the " Pr.48 Zero point return speed"
Zero point
return speed
Near-point dog
Zero point
Machine zero point
return start
Zero point
return direction
Zero point
When the " Zero opoint
shift amount" is negative
Pr.46
Pr.48
Pr.55
When the " Zero point
shift amount" is positive Pr.55
Fig. 12.7 Zero point shift operation at the zero point return speed