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

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5. OPERATION
(3) Structure
Component Description
Servo amplifier
Use standard models.
Servo motor
Battery MR-J3BAT
Encoder cable
Use an encoder cable. (Refer to section 14.1.)
(4) Parameter setting
Set parameter No.PA03 (absolute position detection system) as shown below to enable the absolute
position detection system.
5.8.1 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 programmable 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
I/O circuit
Position data, speed data
(current position read)
EEP-ROM memory
Backup at
power off
LS
Detection of the
number of
revolutions
1X
Detection of position
within one revolution
Within one-revolution counter
High-speed serial
communication
S
peed control
P
osi
tion control
Servo amplifier
Servo motor
Current position
1 pulse/rev. cumulative revolution counter
Home position return
data
1XO
Point table No. selection,
etc.
Parameter No.PA03
Selection of absolute position detection system
0: Incremental system
1: Absolute position detection system
1