Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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16. INDEXER POSITIONING OPERATION
(3) Structure
Component Description
Servo amplifier
Use standard models.
Servo motor
Battery MR-J3BAT
Encoder cable
Use a standard model. (Refer to section 14.1.)
(4) Parameter setting
Set parameter No. PA03 (Absolute position detection system) as indicated below to make the absolute
position detection system valid.
1
Parameter No.PA03
Absolute position detection system selection
0: Used in incremental system
1: Used in absolute position detection system
16.10.1 Outline of absolute position detection data communication
For normal operation, as shown below, the encoder consists of a detector designed to detect a position
within one revolution and a cumulative revolution counter designed to detect the number of revolutions.
The absolute position detection system always detects the absolute position of the machine and keeps it
battery-backed, independently of whether the general-purpose programming controller power is on or off.
Therefore, once the home position is defined at the time of machine installation, home position return is not
needed when power is switched on thereafter.
If a power failure or a fault occurs, restoration is easy.
MR-J3BAT
LSO
1XO
I/O circuit
Position data, speed data
(current position read)
Home position return
data
EEP-ROM memory
Backup at
power off
LS
Speed detection
1X
Detection of position
within one revolution
Within one-revolution counter
High-speed serial
communication
S
pee
d co
ntro
l
P
osi
tion
cont
rol
1 pulse/rev. Cumulative revolution counter
Point table No. selection,
etc.
Servo amplifier
Servo motor
Current position