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12 CONTROL AUXILIARY FUNCTIONS
12.2.2 Zero point shift function
Pr. 48 Zero point return speed
Machine zero point return start
When a machine zero point return is carried out, the zero point is normally established
using the near-point dog, stopper, and zero point signal. However, by using the zero
point shift function, the machine can be moved a designated movement amount from
the position where the zero point signal was detected. A mechanically established zero
point can then be interpreted at that point.
The zero point shift function can be used without relation to " Pr.45 Zero point return
method".
The details shown below explain about the "zero point shift function".
(1) Control details
(2) Setting range for the zero point shift amount
(3) Movement speed during zero point shift
(4) Precautions during control
(5) Setting the zero point shift function
(1) Control details
The following drawing shows the operation of the zero point shift function.
Pr. 46 Zero point return direction
Near-point dog
Zero point signal
Fig. 12.4 Zero point shift operation
Shift operation carried out after
the deviation counter clear and reset.
12 - 8
MELSEC-A
Speed selected by the " Pr. 57
Speed designation during
zero point shift"
Pr.49 Creep speed
Pr.55 Zero point shift amount
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