Mitsubishi Electric MR-J4, Instruction Manual

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12. ABSOLUTE POSITION DETECTION SYSTEM
12 - 6
12.2.3 Using MR-BT6VCASE battery case
POINT
One MR-BT6VCASE holds absolute position data up to eight axes servo motors.
Always install five MR-BAT6V1 batteries to an MR-BT6VCASE.
(1) Configuration diagram
EEP-ROM memory
Servo amplifier
Current
position
Positioning module
Output
Input
I/O module
Current
position
LS
Detecting the
number of
revolutions
1X
Detecting the
position within
one revolution
Counter within one revolution
1 pulse/rev accumulative revolution
counter (1 pulse/rev)
Servo motor
Pulse train
command
High-speed
serial
communication
CPU
LSO
1XO
Backed up in the
case of power
failure
Home position data
Ch
anging
t
he
curren
t
posi
tion data
General purpose
programmable controller
Speed contr
o
l
Posi
tion contr
o
l
MR-BT6VCASE
MR-BAT6V1 × 5
Step-down
circuit
( 6 V
→
3.4 V )
(2) Specification list
Item Description
System Electronic battery backup type
Maximum revolution range Home position ± 32767 rev.
(Note 1)
Maximum speed at power
failure [r/min]
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)
(Note 2)
Battery backup time
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 °C)
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 °C) (Note 4)
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 °C)
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 °C) (Note 3)
Note 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 25% is equivalent to 8 hours power on for a weekday and off for a weekend.