What does Static Converter Fitted or similar annotation mean on a locomotive?
Locos traditionally had a rotary converter (of Arno make) to generate 3-phase AC on board to power auxiliary equipment such as traction motor blowers, compressors, exhausters, etc. Starting in the 1980s static converters using solid-state circuitry to generate 3-phase AC on board have been used instead of the Arno converter, driving up efficiency and reliability by eliminating the moving parts that the Arno contained. Static convertors and microprocessor control have now become standard kit for all new production WAP-4s beginning from the 22640 series. Static convertors have become standard for all new WAG-7’s too. This has also meant that the new locos may not carry the ‘Static Convertor’ or ‘Microprocessor Fitted’ markings despite being equipped with these systems. These locos are now being distributed to all sheds.
