PT-500Ts
Rotary Converter
Description
PT-500Ts aircraft electromechanical converter
PT-500Ts is an aircraft three-phase electromechanical current converter used to transform 27 V DC power from the onboard electrical network into 36 V three-phase AC power at 400 Hz. The unit is intended for aircraft equipment that requires stable three-phase alternating current, including gyroscopic instruments, navigation equipment and automatic flight control system elements. PT-500Ts belongs to the class of rotary motor-generator converters used on Soviet and post-Soviet aircraft and helicopters.
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Power conversion function of PT-500Ts
The main function of PT-500Ts is to provide a centralized 36 V / 400 Hz three-phase AC supply from the 27 V DC aircraft bus. According to the supplied context, the converter delivers 500 VA output power and operates with an inductive power factor. This output is used where onboard instruments cannot be powered directly from the DC network. The converter may work as a main or reserve source of alternating current depending on the aircraft type, electrical system design and installed equipment.
Consumers powered by PT-500Ts
PT-500Ts is used to supply aircraft systems that require three-phase AC power. Typical consumers include gyroscopic instruments, attitude and heading reference equipment, navigation systems and automatic control system units. In aircraft and helicopters, this class of converter may support attitude indicators, gyroverticals, heading systems and autopilot-related equipment. The exact consumer list depends on the aircraft electrical diagram and the configuration of the installed avionics.
Application on aircraft and helicopters
The supplied context indicates use of PT-500Ts on aircraft and helicopters, including Mi-8 / Mi-17 family helicopters and aircraft such as An-24, An-26 and Yak-40, depending on modification and documentation. On helicopters, the unit is normally associated with electrical equipment racks, radio compartments or technical equipment zones inside the fuselage. On aircraft, it may be installed in technical compartments, radio-electrical compartments or underfloor equipment areas.
Construction of the PT-500Ts converter
PT-500Ts is an electromechanical motor-generator unit. It consists of a mixed-excitation DC motor and a synchronous three-phase generator arranged on a common shaft in one housing. A control box, such as KSU-500Ts according to the supplied context, may be mounted on the body of the converter. This control unit is associated with remote starting, voltage / frequency regulation and overspeed protection. Built-in filters, including chokes and feedthrough capacitors, are used to reduce radio interference entering the aircraft electrical network.
Installation and maintenance context
PT-500Ts is installed on a rigid aircraft mounting base, frame or shock-mounted support and requires proper ventilation because the unit heats during operation. Since it is a rotary converter, maintenance should include checks of bearings, brushes, collector / commutator condition, insulation, mounting security, vibration, heating, control box operation and output voltage / frequency under load. When ordering or replacing the unit, the exact aircraft type, converter version, documentation package and service condition should be confirmed.
PT-500Ts is classified as a Rotary Converter and converts aircraft electrical power through an electromechanical motor-generator assembly. Select it by the complete designation, series, execution, marking and approved documentation. Similar lettering, housing or connector geometry does not establish identical operating data. This historical category contains several types of transducing devices. PT, PO and PTS products relate to electrical-power conversion, while PMI, PMT and PMM designations identify vacuum-gauge transducers. Each page therefore follows the actual product function rather than the broad category name. A suffix, series number or extra letter can indicate a materially different circuit, pressure range, rating or interface. The item converts aircraft electrical power through an electromechanical motor-generator assembly. Exact input and output conditions depend on the execution. For a power converter, verify voltage, current type, frequency, phase arrangement, rated output, connectors and cooling. For a vacuum transducer, verify the measurement principle, pressure range, operating mode, vacuum connection and compatible measuring instrument. Numerical values retained from the original catalogue record appear in Technical Details and must be compared with the passport for the actual unit. An aircraft platform or installation system is not assigned by analogy when a reliable source is unavailable. Before replacement, compare the primary and alternative designations, series, input and output ratings, dimensions, mass, connectors, mounting, cooling and documented environmental limits. For a vacuum sensor, additionally compare the conversion constant, emission current or heater resistance where the passport specifies those values. Related members of one family may use different voltage, frequency, power, pressure range, mounting interface or purpose. The related links below support catalogue navigation and do not establish interchangeability. General technical background is available under Rotary Converter. Check the marking and supporting records, housing, connectors, terminals, vacuum fitting, mounting points, seals and any evidence of overheating, impact or corrosion as applicable. Bench testing must follow the documentation for the exact execution; an improvised test voltage or vacuum regime can damage the product. Install the unit only in the intended circuit with the documented polarity, supply mode, load, cooling and safety provisions. After installation, complete the prescribed functional check. External integrity alone does not demonstrate serviceability or calibration. Functionally related catalogue products include PT-200Ts Series 3, PT-1000TSS – 2 series, PT-200Ts-V, PT-1500TsB. They are selected by actual type and family for navigation and do not imply compatibility. More positions are available in the Power Transducers category. An enquiry for PT-500Ts should state the exact designation, quantity, required condition, marking photograph, delivery scope and required documents. When available, include the designation of the equipment and item being replaced. Price, actual availability, lead time and condition of a specific unit are confirmed separately.PT-500Ts: identification and purpose
Function and operating circuit
Selection and compatibility checks
Incoming inspection and installation
Related catalogue positions
Enquiry information
Technical details
Product Type: Rotary Converter
Primary Designation: PT-500Ts
Alternative Designations: PT-500Ts; PT 500Ts; ПТ-500Ц
Function: converts aircraft electrical power through an electromechanical motor-generator assembly
Selection Basis: Exact designation, execution, marking and documentation for the specific equipment
Application: Only as supported by the passport, illustrated parts catalogue or approved installation documentation
Interchangeability: Not established by a related designation, matching base, housing or appearance alone
Inspection: Verify electrical ratings, contacts or connector, mounting, construction and required operating mode
Enquiry Data: Designation, quantity, condition, marking photograph, delivery scope and required documents
Documentation: Product passport and approved operating or repair documentation
Category: Power Transducers
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Retained Technical Data:
Product Type: Aircraft three-phase electromechanical inverter / rotary converter
Designation: PT-500Ts
Alternative Designations: ПТ-500Ц, PT-500C, PT-500TS, ПТ500Ц
Function: Conversion of 27 V DC aircraft power into 36 V three-phase AC power
Application / Where Used: Aircraft AC power supply for gyroscopic, navigation and automatic control equipment
Compatible Aircraft / Equipment: Mi-8 / Mi-17, An-24, An-26, Yak-40 and other aircraft according to supplied context and documentation
Power Conversion Type: Electromechanical motor-generator converter
Input Voltage: 27 V DC ±10%
Maximum Input Current: Not more than 37 A
Output Voltage: 36 V three-phase AC ±3%, with wider deviation under load according to supplied context
Output Frequency: 400 Hz
Output Power: 500 VA
Number of Phases: 3
Phase Connection: Star connection, according to supplied context
Power Factor: 0.8 inductive
Efficiency Context: More than 40%, according to supplied context
Construction: Mixed-excitation DC motor and synchronous three-phase generator on a common shaft
Control Box: KSU-500Ts control box context, depending on version
Interference Suppression: Built-in filters, chokes and feedthrough capacitors according to supplied context
Operating Role: Main or reserve source of 36 V / 400 Hz AC power depending on aircraft electrical system
Installation Area: Radio-electronic equipment bay, electrical equipment rack, underfloor technical compartment or avionics compartment depending on aircraft type
Mi-8 / Mi-17 Installation Context: Radio compartment or electrical equipment racks inside fuselage according to supplied context
Aircraft Installation Context: Technical compartment under cockpit floor or radio-electrical compartment according to supplied context
Approximate Length: 365 mm
Approximate Body Diameter: 140 mm
Approximate Maximum Height: 190–200 mm with control box
Approximate Maximum Width: 170–180 mm across mounting feet
Mass: Approximately 14.3–15 kg with control box
Mounting: Shock-mounted or rigid mounting base with ventilation, depending on aircraft installation
Technical Documentation: Product passport, test report, serviceability certificate, storage records, aircraft wiring diagrams and maintenance documentation if available
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