Machine Zero Point Return Method - Mitsubishi Electric A1SD75P1-S3 User Manual

8 ZERO POINT RETURN CONTROL

8.2.2 Machine zero point return method

The method by which the machine zero point is established (method for judging the
zero point position and machine zero point return completion) is designated in the
machine zero point return according to the configuration and application of the
positioning method.
The following table shows the six methods that can be used for this zero point return
method.
(The zero point return method is one of the items set in the zero point return
parameters. It is set in " Pr.45 Zero point return method" of the basic parameters for
zero point returns.)
Pr.43
OPR method
Near-point dog method
Stopper method 1)
Stopper method 2)
Stopper method 3)
Count method 1)
Count method 2)
*: The zero point input signals of the AD75 in each zero point return method are described below.
Near-point dog method and count method (1): One-pulse signal output per each motor revolution
Stopper stopping method (2), (3):
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Deceleration starts by the OFF
Creep speed".)
The operation stops at the first zero point signal
OFF. When a "deviation counter clear output" is completed, the machine zero point
return is completed.
The stopper position is regarded as the zero point.
After the deceleration starts by the OFF
against the stopper at the "
The machine zero point return is regarded as completed on completion of the deviation
counter clear output provided after "
stoppage.
The stopper position is regarded as the zero point.
After the deceleration starts by the OFF
against the stopper at the "
The machine zero point return is regarded as completed on completion of the deviation
counter clear output provided after the zero point signal
The stopper position is regarded as the zero point.
The machine starts at the "
the stopper at the "
The machine zero point return is regarded as completed on completion of the deviation
counter clear output provided after the zero point signal
The deceleration starts by the OFF
at the " Creep speed".
Pr.49
The machine stops at the zero point signal
Setting for the movement amount after near-point dog ON" from the near point dog OFF
ON position. When a "deviation counter clear signal output" is completed, the machine
zero point return is regarded as completed.
The deceleration starts by the OFF
at the " Creep speed".
Pr.49
The machine moves the distance set in the "
near-point dog ON" from the near point dog OFF
position. The machine zero point return is then regarded as completed.
REMARK
Creep speed
The stopping accuracy is poor when the machine suddenly stops from high
speeds. To improve the machine's stopping accuracy, its must change over to a
low speed before stopping. This speed is set in the " Pr.49 Creep speed".
Operation details
ON of the near-point dog. (Speed is reduced to "
after the near-point dog turns from ON
ON of the near-point dog, the machine presses
Creep speed" and stops.
Pr.49
Zero point return dwell time" passed after
Pr.51
ON of the near-point dog, the machine presses
Creep speed" and stops.
Pr.49
Creep speed" from the beginning, then presses against
Pr.49
Creep speed" and stops.
Pr.49
ON of the near-point dog, and the machine moves
after moving the distance set in the "
ON of the near-point dog, and the machine moves
Pr.52
(Z-phase signal output from drive unit, etc.)
Signal output upon detection of contact with stopper
(Supplied from an external device)
8 - 5
MELSEC-A
is detected after stoppage.
is detected after stoppage.
Setting for the movement amount after
ON position, and stops at that
Pr.49
Pr.52