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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
signal 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 signal
Address increase
direction
Fig. 12.5 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"
(When "
Pr.57 Speed designation during zero point shift" is 0)
Zero point
When the " Pr. 55 Zero poin
t
shift amount" is positive
When the " Pr. 55 Zero point
shift amount" is negative
Pr. 46 Zero point
return direction
Machine zero point
return start
Pr. 48 Zero point
return speed
Near-point dog
Zero point signal
Fig. 12.6 Zero point shift operation at the zero point return speed