Mitsubishi Electric MELSERVO-J2 Series Instruction Manual page 105

4. OPERATION
(4) 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.
Also, the absolute position data, which is battery-backed by the super capacitor in the encoder, can be
retained within the specified period (cumulative revolution counter value retaining time) if the cable is
unplugged or broken.
Point table No. selection
(DI0 to DI3), etc.
(5) Battery installation procedure
1) Open the operation window. (When the model used is the MR-J2-200C or more, also remove the
front cover.)
2) Install the battery in the battery holder.
3) Install the battery connector into CON1 until it clicks.
Operation window
Battery
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Servo amplifier
I/O circuit
Position data, speed data
(current position read)
Servo motor
POINT
The internal circuits of the servo amplifier may be damaged by static
electricity.
Always take the following precautions:
Ground human body and work bench.
Do not touch the conductive areas, such as connector pins and electrical
parts, directly by hand.
Battery connector
Battery holder
For MR-J2-100C or less
search engine
Home position return
data
EEP-ROM memory
LSO
1XO
Backup at
power off
Battery MR-BAT
1 pulse/rev. Cumulative
revolution counter
Super capacitor
Within one-revolution counter
Battery connector
CON1
Battery
4 - 32
Current position
1X
LS
Detection of position
Speed detection
within one revolution
High-speed serial
communication
Battery holder
For MR-J2-200C or more
CON1