Alpha Vision Tech MPS48-7M Manuel D’Utilisation

23

021-511-B4-002, Rev. B

In the event of an AC power outage, the MPS48-7M switches to battery backup mode to 
power the load. The green status LED begins to blink, indicating the load is being powered 
from the battery string. The MPS48-7M runs in battery backup mode until AC power is 
restored, or until the battery string reach a low-voltage shutdown level of 42V. On resumption 
of AC power, the MPS48-7M recharges the batteries at a maximum current of 1.8A.

Under normal conditions, a fl oat charge maintains the batteries at 100% capacity. In the 
event of line failure, battery charging resumes automatically when primary power is restored. 
Charging continues until one of the following occurs:

• 

Battery has reached 100% of capacity. 

• 

Another power failure occurs requiring battery support. Charging ceases until primary 
power is restored. 

• 

Additional power is required by the load, in which case power is diverted from the battery 
charger and sent to the load. When demand for additional power ceases, normal battery 
charging resumes.

 Fig. 5-2, Battery Capacity Versus Temperature

-40°C

0°C

25°C

40°C

20Watts

12.5

13.4

16.0

20

13 hr

40Watts

6.0

6.3

7.6

10

25 hr

50Watts

3.3

4.1

5.7

7.2

50 hr

 Table 5-2, Battery Runtime and Recharge Times

0

20

40

60

80

100

120

-40°F
(-40°C)

-20°F
(-29°C)

0°F
(-18°C)

20°F
(-7°C)

40°F
(4°C)

60°F
(16°C)

80°F
(27°C)

100°F
(38°C)

without heater mat

with heater mat

*This chart is an approximation of the effectiveness of a heater verse no heater.