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12. ABSOLUTE POSITION DETECTION SYSTEM
12 - 4
12.2.2 Using the MR-BT6VCASE battery case
POINT
One MR-BT6VCASE can hold the absolute position data of up to 8-axis servo
motors.
Always install five MR-BAT6V1 batteries to MR-BT6VCASE.
(1) Configuration diagram
CYC0
Current position
Home position data
LS0
Position data
LS
Detecting the
number of
revolutions
CYC
Detecting the
position within
one revolution
Servo motor
Accumulative revolution counter
(1 pulse/rev)
Within one revolution counter
High speed
serial
communication
Servo amplifie
r
Servo system controlle
r
MR-BT6VCASE
MR-BAT6V1 × 5
Step-down
circuit
Position control
Speed control
( 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]
6000
(only when acceleration time until 6000 r/min is 0.2 s or longer)
(Note 2)
Battery backup time
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)
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 five MR-BAT6V1 batteries. The battery life varies depending on the number of target 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.