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12 CONTROL AUXILIARY FUNCTIONS
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.
(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
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 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
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.
Execution status of zero point return retry function
: Execution possible
: Execution not possible
: Execution not possible
: Execution not possible
: Execution possible
: Execution possible
Setting details
12 - 7
MELSEC-A
Factory-set
initial value
0
0
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