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MELSEC-
A
12 CONTROL AUXILIARY FUNCTIONS
(2) Precaution during control
(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
Execution status of zero point return retry function
Near-point dog method : Execution possible
Stopper stop method 1) : Execution not possible
Stopper stop method 2) : Execution not possible
Stopper stop method 3) : Execution not possible
Count method 1) : Execution possible
Count method 2) : Execution possible
(b) Always establish upper/lower limit switches at the upper/lower limit positions
of the machine, and connect an D75P2 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 D75P2 upper/lower limit switches even when the zero point
return function is invalidated. Control cannot be carried out with the D75P2
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 D75P2. If the drive unit power is
turned OFF, the zero point return retry cannot be carried out.
(3) Setting the zero point return retry function
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 D75P2.
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 remote station READY signal [RY(n+7)B]. Set " Pr.58
Dwell time during zero point return retry" according to the user's requirements.
Setting item
Setting
value
Setting details
Factory-set
initial value
Pr.50
Zero point return
retry
1
Set "1: Carry out zero point return retry by limit
switch".
0
Pr.58
Dwell time during
zero point return
retry
Set the deceleration stop time during zero point
return retry.
(Random value between 0 and 65535 (ms))
0
* Refer to section "5.2 List of parameters" for setting details.
REMARK
Parameters are set for each axis.