MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 526)

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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.6 Absolute position restoration function
! CAUTION
When the absolute position restoration is carried out, the servo ON signal may be turned OFF (servo OFF)
for about 20 ms, and the motor may operate. If this is not desired, install an electromagnetic brake
separately and lock the motor by that brake during the absolute position restoration.
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.
[1] Configuration and preparation of absolute position detection system
[2] Outline of absolute position detection data communication
[3] Absolute position signal transmission procedure
[4] Precautions during control
[1] Configuration and preparation of absolute position detection system
(1) Configuration
The following drawing shows the configuration of the absolute position
detection system.
Servo
amplifier
Power
supply
Detector cable
Absolute position holding battery
Control signal connector
1)
2)
3)
4)
PLC system
QCPU
QD75 I/O
module
Operation
panel
Servomotor with absolute position detector
Fig. 12.32 Configuration of absolute position detection system