MD-1000I / MD-2000I / MD-3000I System Function
Important
UPS components are:
– AC to DC power converter (rectifier)
– AC to DC high frequency power inverter
– Smart battery charger
– String consisting of durable maintenance-free batteries
– DC to DC push-pull inverter
– Static bypass lead
– Input and output EMI filter
The following table contains a summary of the UPS' power input and battery
workings.
Power Supply
(utility) Status
UPS Operating Mode LED Display
Normal power Power converter (rectifier)
converts AC to DC, battery
charges, inverter converts DC
to AC, providing clean stable
power
, ,
LEDs illuminate
Power supply
(utility) abnormal
(over or under
voltage) / unavail-
able
Power converter and charger
cease operating, Battery
discharges via DC~DC pro-
tective circuit and delivers
power to the inverter. Load
continues to receive power
from the inverter. Audible
alarm sounds, the UPS is
operating in battery mode.
LED off,
LED illuminates
Power supply
(utility) abnormal /
unavailable, bat-
tery almost dis-
charged
Power converter and charger
cease operating, Battery
discharges via DC~DC pro-
tective circuit and delivers
power to the inverter. Audible
alarm sounds with fast and
short intervals, indicating
battery charge is becoming
critical and the inverter will
soon cease to deliver power.
LED off, &
LED illuminates
MD Series 53
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