AlfaTronix 24Vdc, 12Vdc User Manual

Alfa

TRONIX

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for use on vehicles, vessels and aircraft

PowerVerter24Vdc to

12Vdc

Converters

PowerV erter

24Vdc to

12Vdc

Converters

Also, the low heat dissipation
allows them to be mounted in

less well-ventilated positions
which makes installation
easier.

Rugged and Compact

The converters are enclosed in

a rugged aluminium extrusion.
The low mass Surface Mount
Technology components are also
less prone to vibration damage,

further increasing the reliability
of the units. The use of SMT

results in very compact unit,

making it easier for the installer to

find a convenient location.

Tamper Proof

There are no ventilation holes to permit stray
objects, dust or water droplets to enter the
case. No external fuses to be tampered with.
Fuses will only blow if there is a fault so there
is no need to make them accessible.

Fast Installation

All the units consume an off load current of less
than 15mA, which is probably less than the self
discharge current of the vehicle’s battery. In most
cases this can be ignored, speeding the installation
by removing the need to fit a remote switch.

All the products fit onto a ‘Click ’n’ Fit’
mounting clip which is fixed in three points
allowing it to be mounted on uneven surfaces.
It is easy to fit the clip into awkward places and
then simply click the unit into position.
A red LED indicates when there is output from
the converter, this gives reassurance to the
installation engineer and speeds fault finding.

Product Coding

The product code is developed as follows, take
PV3i as an example:

All the PowerVerter products are CE marked, e

marked and meet the requirements of FCC Class B.

Secure Isolation

It’s your choice. The PowerVerter range offers an
isolated option at every power rating. Some
vehicle manufacturers, such as Scania, require
that ‘the converter shall be ground loss
protected’. This means that the output voltage
shall not exceed the specification if the supply
ground connection or/and the load ground
connection is lost. This requires an isolated
converter. Isolated converters also prevent a
direct connection between the 24Vdc input and
the 12Vdc appliance in the case of a
semiconductor failure.

Cool Running

The converters operate with a power

conversion efficiency as high as 93%.

This results in very little heat being

generated. The reliability of

semiconductors is inversely proportional

to temperature so high efficiency leads

to hig h reliability. The Mean Time

Between Failure figure
is around 160 years!

24Vdc to 12Vdc

Converters

These products offer a convenient way to
operate mass produced 12Vdc equipment,
such as cell phones, in car entertainment
equipment, professional communication
equipment, refrigerators, televisions, etc.
from the 24Vdc mobile electrical systems
found on diesel engined vehicles and vessels
and the 28Vdc systems found on aircraft.

A Comprehensive 24Vdc to 12Vdc

Converter Range

The PowerVerter converter series, is a sub group
of our PowerSelecter range of converters that
offer a wide range of input and output voltages
between 12Vdc and 48Vdc (see the PowerSelecter
leaflet). For voltages above 48Vdc see our
PowerMaster Converter leaflet.

This leaflet covers the PowerVerter series, ten
products from 3 Amps to 30 Amps in isolated or
common earth configurations. They have been
optimised for high volume 24Vdc to 12Vdc
applications such as on heavy goods vehicles,
coaches, buses, construction, forestry and
agricultural vehicles and commercial vessels,
yachts and all types of aircraft. Consequently
they are manufactured at low cost and offer
excellent value for money. All the products may
also be used for constant voltage lead-acid

battery charging

providing the battery

manufacturers

guidelines are

followed.

PV PowerVerter 24Vdc to 12Vdc converter
3 3 amps continuous output

(12 Vdc output at 3 amps)

i Isolated between input and output

(s indicates switchmode, non-isolated)

Technical data

Choose your PowerVerter

GB

07/00

Manufactured in the European Union by AlfaTronix Ltd., Great Britain

Model Size Weight Model Size Weight
PV3s 66x87x50mm 256g PV18s, PV24s,
PV6s, PV3i 88x87x50mm 318g PV12i 166x87x50mm 610g
PV12s, PV6i 126x87x50mm 455g PV18i, PV24i 216x87x50mm 750g

Common Characteristics

Input Voltage Range 17 to 32Vdc
Transient Voltage Protection Meets ISO7637-2 International Standard for 24Vdc Commercial Vehicles
Electro Static Voltage Protection Meets ISO10605, ISO14892, >8kV contact, 15kV discharge
Output Voltage 13.6Vdc. Worst case limits are +15% and -20%
Output Noise <50mV pk-pk at continuous load. Meets CISPR25 and VDE0879-3
Off Load Current <15mA
Power Conversion Efficiency Typically: 85% for isolated units, 90% for non-isolated units
Isolation >400Vrms between input, output and case, on isolated products only
Mean Time Between Failures >162 years (HRD4)
Operating Temperature -25°C to +30°C to meet this specification table

+30°C to +80°C de-rate linearly to 0A
Storage Temperature -25°C to +100°C
Operating Humidity 95% max, non condensing
Casework Anodised Aluminium, Glass Filled Polycarbonate. Dust water and impact

resistance IP533
Connections Four 6.3mm push-on connectors
Output Indicator Red LED adjacent to the output terminals
Mounting Method “Click ‘n‘ Fit” Mounting clip, fitted separately using three hole fixing
Safe Area Protection:

Over Current Limited by current sensing circuit
Over Heat Limited by temperature sensing circuit
Transients Protected by filters and rugged component selection
Catastrophic failure Protected by internal input and output fuses

Approvals 89/336/EEC The EMC Directive

95/54/EC The Automotive EMC Directive

93/68/EEC The CE Marking Directive

VIDG5 For use on Police and Fire Vehicles
Tested to ISO7637, ISO10605, ISO14892, ISO14893, ISO11451, ISO11452, CISPR

25, VDE0879-3, EN60945 Annex A
Markings ‘CE’ Marked and ‘e’ Marked

AlfaTronix Limited 29 Newtown Business Park, Poole, Dorset BH12 3LL Great Britain.
Tel: [phone]. Fax: [phone]. E-mail: [e-mail]
Web Site: http://www.alfatronix.ltd.uk

Alfa

TRONIX

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Isolation

Non-Isolated Isolated

Common Negative Input to Output

Load 3/6A PV3s PV3i

Continuous/

6/10A PV6s PV6i

intermittent

12/18A PV12s PV12i
18/21A PV18s PV18i
24/30A PV24s PV24i

All PowerVerters convert

24Vdc to 12Vdc

The intermittent current may be drawn for a maximum of 2 minutes followed by 8 minutes rest.