7
3.2 The principle of the product
Fig 4 UPS Principle Diagram
1.
input filter: Complete filtering the input AC utility power to
provide the clean power for UPS.
2.
AC/DC converter: Convert the filtered AC mains to DC and boost the
DC for DC/AC inverter.
3.
DC/DC booster: When the UPS works in battery mode, the circuit
boosts the DC for DC/AC inverter.
4.
DC/AC inverter: Convert the boosted DC to stable AC output.
5.
Bypass: When overload or failure of inverting happen in the UPS,
it transfers to bypass mode to supply power to loads.
6.
Charger: Standard unit provides 1A; long backup unit provides
7A/14A.
7.
Battery: Sealed Lead Acid Battery.
8.
Output filter: Complete filtering the output of the UPS to provide
the clean power for loads.
3.3 Model
UPS sort
MODEL NO
Remark
Standard unit
RT 1250VA
Internal 1A charger, 2 high-rate
9AH batteries
RT 2000VA
Internal 1A charger, 4 high-rate
9AH batteries
RT 3000VA
Internal 1A charger, 2 high-rate
9AH batteries
Long backup unit
RT 1250VA（H）
★internal 7A/14A charger,
external 24V battery
RT 2000VA（H）
★internal 7A/14A charger,
external 48V battery
RT 3000VA（H）
★internal 7A/14A charger,
external 72V battery
Notice:long backup unit can choose two chargers connected in parallel,
the charger current is 14A.
