OUTPUT

OUTPUT CURRENTS

OUTPUT RIPPLE

MODEL NUMBER

VOLTAGE

RMS

PK-PK

+5.0V

60.0A

100.0A

0.2%

2.0%

LX550-7620

–5.0V

5.0A

10.0A

0.2%

2.0%

–12.0V

5.0A

10.0A

0.2%

2.0%

+12.0V

10.0A

20.0A

0.2%

2.0%

+24.0V

5.0A

10.0A

0.2%

2.0%

24.0A

–

0.1%

1.0%

LX550-7624

12.0A

–

0.1%

1.0%

LX550-7617

Notes:

1

The multiple output LX550 has a continuous output power rating of 550W.

The single-output versions have a continuous power output rating of

570W. The LX550 cannot operate without fan cooling.

2

Peak power figures for individual outputs on the multiple output unit are

for less than 10 seconds duration. Total output power should not exceed

550W.

3

Fan fitted as standard, see maximum output current specifications.

4

Single output models are adjustable -8%, +16%.

5

A 10% load on the main output is necessary to maintain regulation on the

auxiliaries at full load (multiple output model).

6

The input board is fitted with an autorange circuit as standard which

automatically senses the input voltage and switches to the appropriate

voltage range.

7

Over temperature protection is provided by a thermal switch fitted to the

main transformer. After thermal shutdown (90

powered down and the thermal switch must be allowed cool to 70

before power up.

8

This product is only for inclusion by professional installers within other

equipment and must not be operated as a stand alone product.

Options

•

DC input models for 24V and 48V operation are detailed on page 170.

•

A signals board is available as an option. To order, add the suffix ‘-S’, see

table below.

OPTIONS

SUFFIX

EXAMPLE

None

LX550-7620

Signals

-S

LX550-7620-S

OVERLOAD/SHORT CIRCUIT PROTECTION

The overload/short circuit protection mechanisms are different for the single

output models and the multiple output model.

The single output models will current limit when the output load reaches

105-120% of maximum load during overload or short circuit conditions.

The unit will operate in a constant current mode making the single output

models suitable for battery charging applications.

The multiple output model uses a power limiting function. When the total

output power reaches 600W the outputs will foldback to the values detailed

below:

Output

Foldback Value

+5V

30A continuous

+12V

8A continuous

+24V

4A continuous

–5V/–12V

Protected by 4A Multi Fuse™

The outputs will not foldback until the total output power exceeds the maxi-

mum power limits. This allows the units to have a peak power capability

but it requires that care must be taken not to permanently overload any

individual output. The +5V, +12V and +24V outputs are not individually pro-

tected and it is recommended that the maximum continuous load does not

exceed the value given in the output specifications. The -5V and -12V out-

puts are individually protected by a 4A Multi Fuse™ and the maximum con-

tinuous load should not exceed the value given in the output specifications.

SIGNALS (OPTIONAL)

An optional signals board supplies the following VME utility bus signals:

ACF (AC Fail) Logic 1 to 0 transition occurs >10ms before outputs fall

below 90% of nominal in the event of input failure.

DCF (DC Fail) Logic 0 occurs if output falls below <85%–95% of nominal.

SRS (System Reset) Logic 1 for system OK (AC and DC good and reset

times [200ms])

PM

Power Monitor signal, proportional to the output power, ratio of

10mV/W.

PS

Power Share connections, to be joined for parallel operation of two

or more units, ensuring equal power share. For power share

operation unit outputs need to be set to ±5% of each other and

should be connected in star configurations with the load as star

centre.

OUTPUT CONNECTIONS

MULTI O/P

SINGLE O/P

SIGNALS

1

+5VS

0VS

SRS

2

+5V

0V

ACF

3

+5V

0V

DCF

4

+5V

0V

PM

50V

0V

PS

6

0V

0V

ROF

7

0V

+V

+VS

8

–5V

+V

0V

9

–12V

+V

–

10

+12V

+V

–

11

+24V

+VS

–

12

ROF

ROF

–

INPUT CONNECTIONS

Pin 1

Earth

Pin 2

Neutral

Pin 3

Live

550 Watt

AC/DC universal input switch mode power supplies

AC/DC POWER SUPPLIES

|

550W AC

PAGE 2

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