Weta43 Posted December 11, 2024 Posted December 11, 2024 Watched actual startup video (Příprava vrtulníku Mi-24D), Wags' startup video, looked at the quick-start checklist, the USAF checklist, searched the forum & internet (found a manufacturer's site with a technical description & a list of aircraft it's installed in), but nothing mentions turning it on - or off. What does it supply? Cheers.
Solution K-dot-B Posted December 11, 2024 Solution Posted December 11, 2024 (edited) It supplies the 36 VAC systems if both 36V transformers fail. In an emergency 36VAC is supplied from the inverter to the main and standby attitude indicator, vertical gyro no.2 and the "gyro correction cutout switch". Section 2-69 in the Cold War Air Museum's manual has a lot of info on this. I think it's mostly an emergency solution, and that's why it's never mentioned in normal operations. Edited December 11, 2024 by K-dot-B removed unnecessary info 2
Raffi75 Posted December 11, 2024 Posted December 11, 2024 (edited) The PT-125 converter is an emergency power source. Edited December 11, 2024 by Raffi75 2
Quati Posted January 6 Posted January 6 For the curious ones. Перетворювач ПТ-125Ц-4С: продаж, ціна у Хмільнику. Літаки та вертольоти від ""Аларо+"" - 693260509 Converted Using OCR and Google Translator from here. Quote FREQUENCY STABILIZATION SYSTEM MOTOR-GENERATOR CONVERTERS OF TYPE PT PT converters, consisting of a DC motor, a three-phase generator with permanent magnets and a control unit, are intended to supply special aircraft installations with three-phase current with a frequency of 400 +/-8 Hz at a nominal voltage of 36 V. The rotation speed of the PT converters is maintained by a frequency regulator within the range of 12000 +/-120 rpm. As an example, let us consider the frequency stabilization system of the PT-125 converter. A mixed-excitation motor and a four-pole magnetoelectric generator are made in a common casing with a common shaft. The control unit, mounted in a box fixed to the converter body, consists of a contactor for remote start and shutdown of the converter from the control panel; a filter that reduces the level of interference to radio reception caused by the brush-collector unit of the converter; an automatic frequency regulator that changes the value of the motor excitation current within the limits necessary to maintain a stable speed and frequency of the converter. The converter is powered from the on-board DC network, the voltage of which can vary within 27 +/-2.7 V. 1
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