Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 12 CONTROL SUB FUNCTIONS
12
12.
6 Abs
olut
e Pos
ition
Res
tora
tion
F
unc
tion
12.6
Absolute Position Restoration Function
The "absolute position restoration function" is a function to restore the absolute position of the designated axis by the
absolute position detection system. By this function, the OPR after power OFF such as instantaneous power
interruption and emergency stop is not required, and the restoration operation at site can be carried out easily.
The details of the "absolute position restoration function" are described below.
• Configuration and preparation of absolute position detection system
• Outline of absolute position detection data communication
• Absolute position signal transmission procedure
• Control precautions
(1) Configuration and preparation of absolute position detection system
(a) Configuration
The following drawing shows the configuration of the absolute position detection system.
CAUTION
●
An absolute position restoration by the positioning function may turn off the servo-on signal (servo off)
for approximately 60ms + scan time, and the motor may run unexpectedly. If this causes a problem,
provide an electromagnetic brake to lock the motor during absolute position restoration.
Servo
amplifier
Power
supply
1)
2)
3)
4)
LCPU LD75
I/O
module
Programmable controller system
Absolute position holding battery
Detector cable
Control signal connector
Servomotor with absolute position detector
Operation
panel