Aircraft Combined 400Hz and 28vDC Ground Power Units | Power Systems International

Carina House East, Sunrise Parkway,
Milton Keynes, MK14 6LS, United Kingdom

The SP Series

The SP series of frequency converters utilise the latest in power conversion switching technology to provide aircraft with an extremely flexible and cost effective 400Hz power source for installation at convenient “point of use” locations and in avionics workshops, aircraft maintenance hangars and test laboratories where low noise, ease of use and compact dimensions are demanded.

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Difference to the 400Hz Systems

In contrast to 400Hz systems, found in many older airports, the SP frequency converters have an inherently high power factor of up to 0.98 with a sine wave input low harmonics rectifier input stage. The inverter is an advanced design using high frequency pulse width modulation producing a sine wave output through an integral isolation transformer and via a circuit breaker for indoor use, or with optional contactors for outdoor use.

The frequency converter can be delivered with a single output or dual output circuits and fitted with industrial type of multiple socket outlets or could be supplied with flexible 400Hz power cables and supplementary sensing fitted with standard aircraft power connectors.

What we offer:
  • The frequency converters are supplied with 115V single phase output up to 40kVA and from 10kVA to 180kVA with three phase output.
  • The basic mechanical construction is in vertical format with ingress protection IP20 with optional IP42 and IP54, there is a horizontal version available for mounting on a mobile trolley, trailer or on floor stands.

Useful information

The Basic Mechanical Construction

– Analogue supplementary metering
– 50 / 60Hz input frequency
– Output contractor with interlocking
– Output 400Hz and/or 28vDC flexible cable with aircraft connector
– No break power transfer to aircraft service
– Remote monitoring by interface PCB
– RS232 remote monitoring by computer
– Ingress protection of up to IP54
– Line drop compensation
– Special paint colours and finish, on request

Downloads & Resources

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400hz solid state frequency converters SP series

Combined-400HZ-28VDC.pdf
Filetype : pdf
Filesize : 175 KB
Uploaded : 28/07/2022
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