Absolute Position Restoration Function - Mitsubishi Electric MELSEC-L02SCPU User Manual

7.11

Absolute Position Restoration Function

The absolute position restoration function restores the absolute position of the specified axis using the absolute
position detection system. The Absolute position restoration function (IPABRST1) ( Page 152, Section 7.12.1 (6))
is used to adjust the Axis 1 current feed value (SD1840, SD1841) to the actual motor position. This way, machine OPR
is no longer necessary after the power was cut off due to a momentary power failure or emergency stop, and the on-
site recovery work can be performed easily.
(1) Configuration of Absolute position detection system
No. Component
*1
1)
Servo amplifier
2) Servo motor
3) Encoder cable
Programmable
4)
controller system
*1 Any Mitsubishi general-purpose AC servomotor (pulse-train type) supporting absolute position detection systems
*2 The orders of three input points and three output points are determined, and the device numbers must be consecutive.
Battery for storing absolute position data
1)
Power
supply
Servo
amplifier
3)
Encoder cable
2)
Servomotor with absolute encoder
• Install the battery in the servo amplifier.
• Enable the absolute position detection function of the servo amplifier.
For details, refer to the manual for the servo amplifier used.
• Use a servomotor with absolute position detector.
For details, refer to the manual for the servo motor used.
• Wire the battery power connection lines (BAT/LG signals) to the incremental encoder cable.
For details, refer to the manual for the cable used.
• Absolute position detection data is sent/received using general-purpose I/Os or the I/O module (three
input points, three output points
Connector for control signals
Input Output
LCPU
module module
4) Programmable controller system
Description
*2
).
CHAPTER 7 POSITIONING FUNCTION
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