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4. Dedicated Options
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4-3-3 Battery unit (MDS-A-BT)
This battery is installed outside the servo drive unit. This battery unit backs up the absolute position
data of the multiple servo axes connected to each NC bus line. This battery unit also functions as a
terminator.
(1) Specifications
Battery unit specifications
Type MDS-A-BT-2 MDS-A-BT-4 MDS-A-BT-6 MDS-A-BT-8
Nominal voltage 3.6V
Nominal capacity 4000mAh 8000mAh 12000mAh 16000mAh
Battery continuous backup time Approx. 12,000 hours
Battery useful life 7 years from date of unit manufacture
Data save time during battery
replacement
20 hours at time of delivery, 10 hours after 5 years
Back up time from battery warning
(9F) to alarm occurrence
Approx. 100 hours
Number of backup axes 2 axes 4 axes 6 axes 7 axes
(2) Outline dimension drawings
MDS-A-BT-2/-4/-6/-8
[Unit: mm]
Use an M5 screw for the ø6 mounting hole
CAUTION
1. To protect the absolute position, do not shut off the servo drive unit control
power supply if the battery voltage becomes low (warning 9F).
2. The battery life will be greatly affected by the ambient temperature. The
above data is the theoretical value for when the battery is used at an ambient
temperature of 25°C. If the ambient temperature rises, generally the backup
time and useful life will be shorter.
100
30
15
6
145
160
135
52
17
R3