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Introduction
1.1 General Description
The 2T-HA10F-CD UPS is a 208 Vac, 60 Hz, 3.6 kVA UPS that provides back-up
power to prevent interruptions in the ac power. The UPS protects sensitive
equipment against problems associated with poor quality ac power or a complete
loss of ac power. While online the UPS cleans the ac input, maintains a constant
voltage, and totally isolates the output to the critical load. These actions keep
power-line problems from reaching the load where they can damage software and
hardware and cause equipment to operate erratically. Figure 1–1 illustrates the
interactions of the major components to accomplish this task.
When power for the loads comes from an ac input, the UPS uses the following
components to improve the quality of the power before it reaches the load:
• Isolation transformer
• Bidirectional converter
These components work together to reduce the inherent problems of raw ac, such
as the following:
• No voltage (blackout)
• Undervoltage (brownout)
• Overvoltage
• Surges
• Spikes
• Common-mode noise
• Normal-mode noise
If the ac input fails to supply the power required by the load (during a blackout,
for instance), the UPS immediately and automatically draws power from the
battery and continues to supply clean power to the load without interruption.
When this happens, the UPS uses the following components:
• Battery
• Bidirectional converter
Introduction 1–1
