Ups Operating Modes - Eaton 93PS-8(20)-20(-C) User And Installation Manual

93ps 8–40 kw

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Eaton 93PS UPS 8–40 kW

bypass are seamless and performed automatically by the system as needed, for

example, in case of an extended system overload.

Each UPM includes a rectifier, battery converter, inverter and independent

controls. Each UPM is able to operate and share the load independently,

despite the status of the other UPMs.

In addition, the system can have a UPS-internal maintenance bypass switch as

a factory-installed option.

The 93PS UPS 20 kW frame includes one UPM and internal batteries. It can

include a 20 kW or 40 kW rated static bypass. The 93PS UPS 20 kW C-model

frame contains only the electrical part of the 93PS UPS and no internal

batteries. It can also include a 20 kW or 40 kW rated static bypass. The 93PS

UPS 40 kW frame includes one or two UPMs, internal batteries and a 40 kW

rated static bypass. In addition to the internal batteries, external batteries can

also be connected.

Hazardous voltage can exist in the battery circuit until disconnected from

external battery source.

In the 40 kW frame, the two UPMs are paralleled internally.

The rectifier input switch and battery breaker are available as standard for all the

models. The internal MBS is available as option for all the models.

If utility power is interrupted or falls outside the parameters specified in Chapter

, the UPS uses a backup battery supply to maintain power to the critical load

for a specified period of time or until the utility power returns. For extended

power outages, the UPS allows you to either transfer to an alternative power

system (such as a generator) or shut down your critical load in an orderly

manner. The UPS bypass consists of a continuous-duty static switch and a

backfeed protection isolation device. All the models also include an internal fuse

in the bypass line. The backfeed protection and bypass fuse are located in

series with the static switch.

3.2

The UPS operating modes are as follows:

•

Normal operating modes:

•

In the double conversion mode, the critical load is supplied by the

inverter, which derives its power from rectified utility AC power. In this

mode, the battery charger also provides charging current for the battery,

if needed.

•

In the Energy Saver System (ESS) mode, the critical load is supported

securely by utility power through the static bypass switch with double

conversion available on-demand with typically less than a 2 ms transition