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MegaLine Rack 1250
Инструкция по эксплуатации Страница: 31

Legrand MegaLine Rack 1250 [31/132] Operation

Megaline Rack

Block diagram

2.1 Operating principle

When the mains supply is present, the input voltage is filtered and rectified by a special input stage (power factor corrector)

which is able to optimise the absorption of current from the mains, so that the power factor becomes practically unitary,

and to compensate for any shifts in voltage.

This stage is able to supply the output inverter even in conditions of very low mains voltage.

This feature becomes very striking with very low loads: with a load of around 50% nominal load, mains operation is

possible as low as about 100 V without any exploitation of battery power.

This enables more “intelligent” management of the switchover to battery power, minimising use of the batteries.

The voltage is rectified at the first stage and then taken up by a high frequency inverter to produce the ‘clean’ sinusoidal

output voltage, offering very low distortion rates. A rapid, synchronised by-pass circuit intervenes during peaks of

absorption above the inverter’s capacity, for example when certain peripherals are switched on, demagnetisation of large

colour monitors, etc.

Should the mains voltage fail or be subject to excessive sag, a booster stage is automatically activated.

This employs the batteries and safeguards the supply of power to the output inverter, and thus to the load, without

any break. The circuitry is a passing neutral type, i.e. with no alteration of the neutral system of the appliances

connected to it.

During normal operation, a sensor verifies the difference in potential between the neutral wire and the earth wire: should

this be excessive, it will activate the input protection and switch the UPS over to battery mode, signalling the anomaly.

It is, however, possible to modify the parameters of the software so that only signalling is provided, if preferred.

All the UPS functions are supervised by a microprocessor that is also able to control and memorise certain operating

conditions, in addition to managing the UPS interface with a computer by means of a

RS 232 serial line.

This makes it possible to control the operating functions and any anomalies in real time.

The UPS keeps the operator informed regarding its operating status using visual and acoustic signals:

- alphanumeric display 1 on page 35

- status indicator 7 on page 35

- acoustic signal (located inside the UPS)

2. Operation

By pass

Input

Filter

Batteries

Output

Filter

Inverter

Power

Factor

Corrector

Voltage

Booster

Battery

Charger

Power

Module

Power Module

Micro-

processor

Logic

RS 232

Interface

Remote

Control

Output

Legrand MegaLine Rack 1250 [31/132] Operation

Содержание

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