Mitsubishi Electric MR-J2S-CP Instruction Manual page 132

4. OPERATION
(3) Structure
Servo amplifier
Servo motor
Battery
Encoder cable
(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
WARNING
Component
Servo amplifier
I/O circuit
Position data, speed data
(current position read)
Servo motor
1 pulse/rev. Cumulative
revolution counter
Super capacitor
Within one-revolution counter
Before installing a battery, turn off the main circuit power while keeping the control
circuit power on. Wait for 15 minutes or more until the charge lamp turns off. Then,
confirm that the voltage between P and N is safe with a voltage tester and others.
Otherwise, an electric shock may occur. In addition, always confirm from the front
of the servo amplifier whether the charge lamp is off or not.
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.
Use standard models.
MR-BAT or A6BAT
Use a standard model.
When fabricating, refer to (2), section 14.1.4.
Home position return
data
EEP-ROM memory
LSO
1XO
Backup at
power off
LS
Speed detection
Battery MR-BAT
4 - 41
Description
Current position
1X
Detection of position
within one revolution
High-speed serial
communication