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400 Hz Frequency Converters

Rotary UPS

Rotary Frequency Converter APOJET AJR 20 kVA to 180 kVA

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The APOJET AJR rotary frequency converter is designed to generate 400 Hz power for aircraft as a decentralised ground power system mounted on the apron or near by the rotunda. Using the latest state-of-the-art technology for the system control and several decades of experience in manufacturing of rotary converters, the APOJET AJR offers the best reliability for aircraft ground power supply systems with high overload capability and with absolutely no mains disturbance.

  • Rating 60 kVA to 150 KVA
  • monobloc converter (two bearings only)
  • high overload capability
  • noise reducing compact design (one cabinet containing converter and switchgear)
  • special earth leakage protection
  • stable operating performance due to microprocessor control
  • low output distortion factor
  • no mains disturbance
  • high degree of user-friendliness due to intelligible control panel interface for remote control and centralized control / indication, PC or modem connection

Static Frequency Converter APOJET AJS 40 kVA to 200 kVA

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The APOJET AJS static frequency converteris designed to generate 400Hz power in workshops for aircraft equipment service or in hangars. Using the latest state-of-the-art technology and newest trends in the power electronics field and digital control, the system offers the best solution for aircraft ground power supply systems without any harmful harmonic distortion back into the mains.


Rating from 40 kVA to 200 kVA

  • Regulated rectifier with IGBT´s (THD at input current < 5%)
  • Fully-controlled inverter with IGBT´s
  • Pulse-width modulation
  • Special earth leakage protection
  • Stable operating performance due to microprocessor control
  • Low output distortion factor
  • Constant output voltage even with non-linear loads
  • High degree of user-friendliness
  • Interface for remote control and centralised control/indication, PC or modem connection

Gatebox APOJET AJT 90 to 180 kVA

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The APOJET AJT step down transformer (Gatebox) is designed to step down the high 400Hz transmission voltage supplied by a centralised Ground Power System.

The system can be installed either on the apron or beside a boarding bridge. It is also available as a two-cabinet version. Using the latest state-of-the-art technology and newest trends in the power electronics field and digital control, the APOJET AJT offers the best solution for aircraft ground power supply systems.

Rating 90 to 180 KVA

  • Electronically regulated output voltage (by thyristors)
  • Fully-controlled by microcontrollers
  • Remote voltage sensing
  • High degree of user-friendliness
  • Interface for remote control and centralised control / indication,
    PC or modem connection
  • Special earth leakage protection