ENI-PL110/400AC Converter

Przetwornica ENI-PL110/400AC
rysunek techniczny przetwornicy ENI-PL110/400AC



The ENI-PL110/400AC converter is intended as a power supply source for three-phase loads and fed from the 110 VDC electric locomotive on-board system.


 Supply voltage  66 ÷ 130 VDC
 Rated output voltage  3 x 400 V, 50 Hz
 Output voltage variation  ± 5 V, ± 0,3 Hz
 Rated power output  12 kVA, cosø=0,8
 Output current limit  42 A
 Weight  65 kg
 Ambient temperature  -30ºC ÷ +40ºC
 Size (w/o mounting fixtures and connections)  800 x 500 x 400 mm
 Installation  locomotive body interior


The converter is contained within a stainless steel enclosure. The enclosure is hot-dip zinc and powder coated for anticorrosion protection. One of the enclosure side walls is removable for service access to the device interior. The converter is installed on the locomotive structural frame with four M10 bolts. A sealed terminal box is located on the left side of the device. The power connections are made with M8 screw terminals, and the control line connections are made with a terminal strip. The enclosure houses the complete electrical system of the converter, comprising:

  • an IGBT based voltage step-up converter;
  • a three-phase inverter, based on IGBT smart power modules;
  • an output filter with stripping of output voltage and current higher harmonics.


The converter transforms 110 VDC input voltage into stabilised 3 x 400 V, 50 Hz output voltage. The 110 V input voltage is stepped up in the transformer and fed to the three-phase output inverter.
The output inverter converts the intermediate DC voltage into the modulated three-phase output voltage with stabilised 50 Hz first harmonic frequency. To reduce the harmonic content of current and voltage, the three-phase output filter is applied.
The device does not provide galvanic separation of the input terminals from the output terminals. The converter is turned on when the locomotive controller commands the device to start with the battery bank online.


schemat blokowy przetwornicy ENI-PL110/400ac

Power kW
Input voltage
110 VDC
Output voltage
3 x 400 VAC

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