12. ABSOLUTE POSITION DETECTION SYSTEM
12 - 9
12.2.2 Using MR-BAT6V1BJ battery for junction battery cable
(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
MR-BAT6V1BJ
Battery
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
Changing the
current
position data
General purpose
programmable controller
Step-down
circuit
Step-down circuit
Primary lithium battery
Speed control
Position control
(6 V 3.4 V)
(2) Specifications
(a) Specification list
Item Description
System Electronic battery backup type
Battery Model MR-BAT6V1BJ
Battery pack 2CR17335A (primary lithium battery)
Nominal voltage [V] 6
Nominal capacity [mAh] 1650
Storage temperature [°C] 0 to 55
Operating temperature [°C] 0 to 55
Amount of lithium metal [g] 1.2
Mercury content Less than 1 ppm
Dangerous goods class
Inapplicable to Class 9
(Battery pack containing 2 g or less lithium)
Operating humidity and storage
humidity
90 %RH or less (non-condensing)
Mass [g] 66
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)
(Note 2)
Battery backup time
Rotary servo motor
Approximately 20,000 hours (equipment power supply: off, ambient
temperature: 20 °C)
Approximately 29,000 hours (power-on time ratio: 25%, ambient
temperature: 20 °C) (Note 4)
(Note 3) Battery life 5 years from date of manufacture
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 MR-BAT6V1BJ battery for junction battery cable. 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. Quality of the batteries degrades by the storage condition. The battery life is 5 years from the production date regardless of the
connection status.
4. The power-on time ratio 25% is equivalent to 8 hours power on for a weekday and off for a weekend.
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