12. ABSOLUTE POSITION DETECTION SYSTEM
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12.6.5 How to process the absolute position data at detection of stroke end
The servo amplifier stops the acceptance of the command pulse when off of LSP or LSN are detected,
clears the droop pulses to 0 at the same time, and stops the servo motor. At this time, the programmable
controller keeps outputting the command pulse. Since this causes a discrepancy between the absolute
position data of the servo amplifier and the programmable controller, position mismatch will occur if the
operation is continued. To prevent this difference in position data from occurring, do as described below.
When the servo amplifier has detected the stroke end, perform JOG operation or the like to clear the stroke
end.
After that, switch SON off once, then on again, or switch the power off once, then on again. This causes the
absolute position data of the servo amplifier to be transferred to the programmable controller, restoring the
normal data.
12.7 Absolute position data transfer errors
POINT
When the following alarm or warning occurs, refer to "MELSERVO-J4 Servo
Amplifier Instruction Manual (Troubleshooting)" to remove the failure.
[AL. 25 Absolute position erased]
[AL. 96 Home position setting warning]
[AL. E3 Absolute position counter warning]
[AL. E5 ABS time-out warning]
[AL. EA ABS servo-on warning]
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