The GUINAULT ground power unit produces 400Hz and 28VDC power to supply the aircraft during a stop on the ground. The unit can be operated for maintenance and handling purposes.

The engine, driving the alternator, settles the frequency of the alternative generation. The electronic speed regulation ensures the stability of the performances in continuous working and during transiants, as per GPU performances and ain compliance with the standards in force.

When the alternator is driven by the engine at its nominal power, the alternator supplies the power required by the aircraft, up to the dimensioning nominal power and admissible overloads. The voltage regulator ensures the stability of the performances in continuous working and during the load transients, in compliance with the standards in force.

Technical data:

  • Distribution according to request : 1 (or 2)×400 Hz circuit (s), 1×28VCC circuit, 1×50 Hz circuit
  • Nominal power of the 400 Hz generation : 100 kVA at p.f. 0,8
    • admissible overload on the 400 Hz generation : 112 kVA at p.f. 0,8 during 5mn
  • Nominal power of the 28 VCC generation : 600A permanent
    • admissible overloads on the 28 VCC generation : 800A functional overloads / 2400A at instantaneous peak
  • Nominal power of the 50 Hz generation : 2.2 kVA at p.f. 0,8
  • Diesel engine : IVECO type NEF45 TM2 at 2182 rpm
  • 400 Hz GUINAULT alternator type AS250M150V3
  • GUINAULT transformer rectifier unit (TRU) type RS493
  • Operating temperature : - 20°C to + 50°C

About the manufacturer

GUINAULT has been supplying the European aeronautics industry for more than 60 years. Maurice GUINAULT founded the company GUINAULT in 1949. The generators of the time mainly supplied continuous electric current at 28 volts to airplanes. In the early 1970s, GUINAULT manufactured the first 400Hz ground power unit produced in France for the Boeing 707, which was a novelty on French soil. In the early 1990s GUINAULT manufactured the first multi-voltage GPU, based on multi-coil alternators. Customers included Dassault (Mirage aircraft), Aerospatiale (now EADS) and Sud Aviation (now Eurocopter). In 2000, GUINAULT designed the variable speed electronically controlled pneumatic starting unit (ASU), while the first 400 Hz static converter was designed and produced in 2001. In 2010, GUINAULT jointly designed a unique, ultra-compact and electronically controlled air conditioning unit for military applications with a refrigeration partner and developed a complete range.