Introduction
Figure 1–1 2T-HA10F-CD UPS Functional Diagram
Filter &
Surge
Suppressor
Online
Bidirectional
Converter
Control
Battery
Circuit
Breaker
Trip
AC Input
Circuit
Breaker
AC Input
Batteries
Filter
Isolation
Transformer
Automatic
Bypass
LED Status
Display
Output
Receptacle
Panel
Loads
2T−HA10F−CD UPS
MKV−040000216−01−91−RAGS
1.1.1 Bidirectional Converter
The bidirectional converter conditions the electricity that powers the load.
When the UPS draws power from an ac input, the bidirectional converter can
simultaneously convert ac to dc to charge the batteries, and feed regulated ac
voltage to the isolation transformer for output to the load.
When the batteries feed the UPS, the bidirectional converter changes dc to ac,
and feeds the ac voltage to the isolation transformer for output to the load.
1.1.2 Battery Backup
In normal operation the ac input powers the loads through the UPS. If the ac
input strays outside the specified input tolerance, a relay disconnects the ac input
and the UPS draws power for the loads from the batteries. If the ac input returns
to the specified tolerance, the relay closes and the UPS continues to provide
regulated, conditioned power for the load, while simultaneously recharging the
batteries.
The battery unit consists of six 12 Vdc lead-acid batteries connected in series.
These batteries provide approximately 10 minutes of back-up time when the UPS
is under full-load.
1–2 Introduction
