Mitsubishi A1SD75M3 User Manual page 531

12 CONTROL AUXILIARY FUNCTIONS
[2] Outline of absolute position detection data communication
(2) Preparations
Note the contents of the following table for preparations of the absolute position
detection system.
Component
1) Servo amplifier
(MR-H-B (MR-H-BN),
MR-J-B, MR-J2-B,
MR-J2S-B)
2) Servomotor
3) Detector cable
As shown in the system block diagram in Fig. 12.32, the current absolute position is
stored by the battery fitted to the servo amplifier, and the absolute position of the zero
point is stored in the FeRAM of the AD75.
Making a zero point return once at the installation of the machine eliminates the need
for a zero point return at subsequent power-on.
After powering on the AD75 and servo amplifier, start communication between the
AD75 and servo amplifier to restore the absolute position.
AD75
Unit setting,
No. of pulses per rotation,
Movement amount per
rotation,
Unit magnification,
Rotation direction,
Zero point address
Current feed value
Machine feed value
Read Write
Absolute position of
zero point
FeRAM
Fig. 12.32 Outline of absolute position restoration function
•
Install the battery (MR-BAT, A6BAT) to the servo amplifier.
•
Validate the absolute position detection function of the
servo amplifier.
For other details, refer to the manual of the servo amplifier.
•
Use the servomotor with absolute position detector.
For other details, refer to the manual of the servomotor.
•
Add the connection of the battery power supply (BAT/LG
signal) to the wiring of the incremental detector cable.
For other details, refer to the manual of the cable.
Battery
Battery backup
Servomotor
Absolute position data
12 - 59
MELSEC-A
Description
Servo amplifier
(Detector)