Mitsubishi A1SD75M1, User Manual

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12 - 14
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
(2) Precautions during control
(a) The position/speed commands of the backlash compensation amount are
not added to the " Md.29 Current feed value" or " Md.30 Machine feed
value".
(b) Always carry out a machine zero point return before starting the control
when using the backlash compensation function (when " Pr.12 Backlash
compensation amount" is set). The backlash in the mechanical system
cannot be correctly compensated if a machine zero point return is not
carried out.
(c) Set one backlash compensation (value in which the " Pr.12 Backlash
compensation amount" is divided by the "movement amount per pulse") to a
value of 255 or less. A "setting error" will occur if 255 is exceeded.
(Depending on the connected servo, tracking may not be possible if the
backlash compensation is large.)
Backlash compensation amount
0
≤
Movement amount per pulse
≤
255
(Omit values after the decimal point.)
(3) Setting the backlash compensation function
To use the "backlash compensation function", set the "backlash compensation
amount" in the parameter shown in the following table, and write it to the AD75.
The set details are validated at the rising edge (OFF ON) of the PLC READY
signal (Y1D).
Setting item
Setting
value
Setting details
Factory-set
initial value
Pr.12
Backlash
compensation
amount
Set the backlash compensation amount. 0
* Refer to section "5.2 List of parameters" for setting details.
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.