Mitsubishi Electric A1SD75P1-S3 User Manual page 413

12 CONTROL AUXILIARY FUNCTIONS
(2) Precaution during control
(3) Setting the zero point return retry function
Setting item
Zero point return
Pr.50
retry
Dwell time during
Pr.58
zero point return
retry
* Refer to section "5.2 List of parameters" for setting details.
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(a) The following table shows whether the zero point return retry function may
be executed by the " Pr.45 Zero point return method".
Pr.45 Zero point return method
Near-point dog method
Stopper stop method 1)
Stopper stop method 2)
Stopper stop method 3)
Count method 1)
Count method 2)
(b) Always establish upper/lower limit switches at the upper/lower limit positions
of the machine, and connect an AD75 module. If the zero point return retry
function is used without hardware stroke limit switches, the motor will
continue rotation until a hardware stroke limit signal is detected.
(c) Always wire AD75 upper/lower limit switches even when the zero point
return function is invalidated. Control cannot be carried out with the AD75
unless the wiring is carried out.
(d) Do not carry out settings so that the drive unit power turns OFF by the
upper/lower limit switches connected to the AD75. If the drive unit power is
turned OFF, the zero point return retry cannot be carried out.
To use the "zero point return retry function", set the required details in the
parameters shown in the following table, and write them to the AD75.
When the parameters are set, the zero point return retry function will be added to
the machine zero point return control. The set details are validated at the rising
edge (OFF ON) of the PLC READY signal (Y1D). Set " Pr.58 Dwell time
during zero point return retry" according to the user's requirements.
Setting
value
Set "1: Carry out zero point return retry by limit
1
switch".
Set the deceleration stop time during zero point
return retry.
(Random value between 0 and 65535 (ms))
REMARK
•
Parameters are set for each axis.
•
It is recommended that the parameters be set whenever possible with the AD75
software package. Execution by sequence program uses many sequence
programs and devices. The execution becomes complicated, and the scan times
will increase.
Execution status of zero point return retry function
: Execution possible
: Execution may not be possible due to the stopper
: Execution may not be possible due to the stopper
: Execution not possible
: Execution possible
: Execution possible
Setting details
12 - 7
MELSEC-A
Factory-set
initial value
0
0