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MELSEC-Q
8 OPR CONTROL
8.4 Selection of the OPR setting condition
8.4.1 Outline of the OPR setting condition
If executing the home position return (OPR), it is necessary to make sure that the
servomotor has been rotated more than one revolution and passed the Z phase (Motor
reference position signal) and that the zeroing pass signal (
Md.108
Servo status : b4)
has turned ON.
However, if selecting "1: It is not necessary to pass through the Z phase after the
power on." with "
Pr.180
Function selection C-4", it is possible to turn the zeroing pass
point signal (
Md.108
Servo status : b4) ON without passing the zero point.
Data setting
To select the "OPR setting condition", set the data shown in the following table to
the QD75MH using the peripheral device.
Servo parameters are set for each axis.
The "OPR setting condition" is stored into the following buffer memory addresses.
Buffer memory address
Setting item
Setting
value
Setting details
Axis 1 Axis 2 Axis 3 Axis 4
Pr.180
Function selection
C-4 (PC17)
0
0 : Need to pass motor Z phase after the
power supply is switched on.
1 : Not need to pass motor Z phase after
the power supply is switched on.
30180 30380 30580 30780
Refer to Section 5.2.9 "Servo parameters (Expansion setting)" for information on the storage details.
Precautions during operation
(1) If setting the above servo parameter to "1: It is not necessary to pass through
the Z phase after the power on.", the restriction, "If executing the home
position return (OPR), it is necessary to execute OPR after rotating the
servomotor more than one revolution and letting it pass through the Z phase
(Motor reference position signal).", will be invalid.
(2) Set the parameter value and switch power off once (The parameter is
transferred to servo amplifier from QD75MH), then switch it on again to make
that parameter setting valid.