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4. Dedicated Options

4 - 11

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

145

160

135