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Chapter 1 Product Introduction

1.4 Operating Principle

The operating principle of the UPS is shown in Figure 1-3.

Bypass

I/O filter

Rectifier/PFC

Inverter

Mains

DC/DC charger

Output

Battery

GND GND

Figure 1-3 Operating principle

1. The UPS is composed of mains input, I/O filter, rectifier/PFC, DC/DC charger, inverter, bypass, battery and UPS

output.

2. When the mains is normal, the rectifier will start, and the DC/DC charger will charge the battery string. Before

turning on the UPS, the output voltage is the bypass voltage. After turning on the UPS, the electronic transfer switch

connects the inverter output to the load, and the mains supplies DC power to the inverter through the rectifier/PFC

circuit. The inverter then converts DC power into pure sine wave AC power, and supplies AC power to the load

through the electronic transfer switch.

3. When the mains is abnormal, the rectifier/PFC circuit boosts the battery voltage and supplies it to the inverter. The

inverter then converts it into pure sine wave AC power, and supplies AC power to the load through the electronic

transfer switch.

4. After the mains returns to normal state, the UPS will automatically transfer from Battery mode to Normal mode, the

mains power supplies DC power to the inverter through the rectifier/PFC circuit, and then the electronic transfer

swit

supplies DC power to the load.

1.5 UPS State And Operation Mode

The UPS state and operation mode include: Normal mode, Bypass mode, Battery mode, ECO mode and Fault state.

For the indicators introduced in this section, refer to Chapter 3 Operation And Display Panel.

1.5.1 Normal Mode

When the mains input is normal, the load is powered with voltage-stabilizing and frequency-stabilizing power by the

mains after processing of the rectifier and the inverter, and meanwhile, the operation mode that the charger charging

the battery is the Normal mode. In Normal mode, the inverter indicators are on (green).

1.5.2 Bypass Mode

If the overload overtime, inverter or rectifier failure appear during the UPS operation in Normal mode, the UPS will

transfer to Bypass mode, that is, the load is powered by the bypass source, which comes directly from the mains

input; if the rectifier is normal, the internal charger will charge the battery. In Bypass mode, the inverter indicators are

off.

Note

In the event of mains failure or mains voltage out of range in Bypass mode, the UPS will shut down and stop the output.

Emerson Adapt User Manual

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