Power Systems International Introduces New Range of 400Hz Frequency Converters for Aircraft Ground Power

Power Systems International introduces its new EL series of solid state industrial frequency converters with 400Hz output for point of use application in laboratories, avionics repair
workshops, hangars and for aircraft ground power in military locations and civil airports.

These compact dimensioned frequency converters can be supplied in single module or in parallel configuration to provide 400Hz power through a ring main distribution system for individual point of use
power outlets for service installations in workshops, hangars and in hard shelters.

The frequency converters can be supplied with a second output 28VDC DC for helicopter starting and for auxiliary generator starting duty, can also be installed outdoors in all weather environments on off shore helipads and landing platforms.

The single module 400Hz point of use application converters can be used for installation adjacent to aircraft parking positions, or fitted to the passenger loading bridges or floor mounted in workshops, hangars or where a centralised system with distribution would not be a cost effective alternative
consideration.

This ‘point of use’ power unit is an important consideration for airport expansion projects where a pier is added to a passenger terminal.

The single module frequency converters are simple to connect to normal available mains sources and they can be located close to the aircraft point of use without the need for line drop compensators,
supplementary transformers, specialised pits, ducts or other apron excavation work.

The frequency converters can be provided with telemetering, remote monitoring feature that allows full observation of critical functions, operational behaviour, interfacing with the connected load and the power consumption at the point of use.

Power Systems International offers design consultancy and project management for the application of frequency converter systems and power distribution for connecting into existing or new apron pit
systems.

Power Systems International also supplies automatic cable handling and retrieval systems for passenger loading bridge mounting or the flexible Z fold crocodile systems for use at the apron point of aircraft parking and ground service.

The EL series 400Hz frequency converters are available in capacities of 2kVA to 25kVA with single phase output and from 7.5kVA to 300kVA with three phase output. The input stage can be 6 pulse or 12 pulse rectifiers, the inverters use IGBT PWM commutating technology, the indoor maintenance hangar versions
have ingress protection P21, the outdoor versions have IP54 protection.

A new dual 2 x 90kVA version frequency converter system is now available built into in a single enclosure measuring only 1500 wide x 800 deep x 1800 high. This compact unit contains 12 pulse
rectifier and two separate 90kVA inverters with two separate outputs and connections for feeding the wide bodied aircraft that require external power from two input cables.

The output of each inverter can be switched to deliver power through either of the dedicated cables or the outputs can be connected in parallel.

The control logic detection circuit on all of the EL series converters synchronises the output to the onboard aircraft 400Hz service and thus ensures there is a no-break transfer of power to the aircraft power distribution system when the converter is connected.

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