Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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12 ABSOLUTE POSITION DETECTION SYSTEM
12.2 Battery
Using MR-BT6VCASE battery case
• One MR-BT6VCASE can hold the absolute position data of up to 8-axis servo motors.
• Always install five MR-BAT6V1 batteries to an MR-BT6VCASE.
Configuration diagram
Specification list
*1 Maximum speed available when the shaft is rotated by external force at the time of power failure or the like. Also, if power is switched on
at the servo motor speed of 3000 r/min or higher, position mismatch may occur due to external force or the like.
*2 The data-holding time by the battery using five MR-BAT6V1s. The battery life varies depending on the number of axes (including axis for
using in the incremental system). Replace the batteries within three years since the operation start regardless of the power supply of the
servo amplifier on/off. If the battery is used out of specification, [AL. 25 Absolute position erased] may occur.
*3 The power-on time ratio of 25% is equivalent to when the power is on for 8 hours a day on weekdays and off on weekends.
Item Description
System Electronic battery backup type
Maximum revolution range Home position

32767 rev.
Maximum speed at power failure [r/
min ]
*1
Rotary servo motor 6000
(only when acceleration time until 6000 r/min is 0.2 s or more)
Direct drive motor 500
(only when acceleration time until 500 r/min is 0.1 s or more)
Battery backup time
*2
Rotary servo motor Approximately 40,000 hours/2 axes or less, 30,000 hours/3 axes, or 10,000
hours/8 axes
(equipment power supply: off, ambient temperature: 20
 )
Approximately 55,000 hours/2 axes or less, 38,000 hours/3 axes, or 15,000
hours/8 axes
(power-on time ratio: 25%, ambient temperature: 20
 )
*3
Direct drive motor Approximately 10,000 hours/2 axes or less, 7,000 hours/3 axes, or 5,000
hours/4 axes
(equipment power supply: off, ambient temperature: 20

)
Approximately 15,000 hours/2 axes or less, 13,000 hours/3 axes, or 10,000
hours/4 axes
(power-on time ratio: 25%, ambient temperature: 20

)
*3
LSO
1XO
MR-BT6VCASE
MR-BAT6V1 × 5
EEP-ROM memory
Servo amplifier
Current
position
LS
Detecting the
number of
revolutions
1X
Detecting the
position within
one revolution
One-revolution counter
Cumulative revolution counter
(1 pulse/rev)
Servo motor
Command
position
High speed
serial
communication
Home position data
Controller
Step-down
circuit
(6 V
ൺ
3.4 V)
Position control
Speed control
Backup at
power off