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Internal relay contacts

Figure 2-5: Route of the electric energy running through the UPS in Online mode

The 3-phase AC input power supply is converted into stable DC voltage through a multi-level

converter composed of IGBT before it’s supplied to the inverter. On the display, the state of the

UPS is shown as “Online Mode”, and the UPS is in “In Service” state.

The input to the battery converter is the DC output from the rectier, and supplies adjustable

charging current to the battery. The UPS is usually connected to a battery, and it supplies energy

to the inverter when AC input is unavailable.

The inverter supplies 3-phase AC output to the load. The inverter converts the output DC power

of the rectier to controllable AC output by the multi-level conversion function of IGBT and PWM.

If the input AC power fails or is out of range, the UPS will switch to battery mode automatically to

supply uninterrupted power to the load. When AC power recovers, the UPS can switch to Online

mode automatically.

If Online mode is overloaded or unavailable, the UPS can accurately switch to bypass mode and

supply power to the load via the static bypass. In the case of any abnormal circumstance (e.g.,

the overload removal takes long or the operation parameters restore to the specied range), the

UPS can return to Online mode automatically.

When redundancy is not available to the UPS due to large load, the UPS will switch to bypass

mode automatically and maintain at the mode until the failure is xed during maintenance, and

the UPS turns normal.

In an external parallel redundant system, each UPS can be isolated from the system to facilitate

maintenance, while other UPSs continue to supply power to the load in Online mode.

Eaton 93PR Series User Manual

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