Frequency Converters from 3.5KVA to 2MVA, 400Hz, 50Hz, 60Hz

PCTI's Solid State Frequency Converters

PCTI can provide the frequency converters you need for any commercial, industrial or military application including 400Hz frequency converters for aircraft ground support and other combinations of input/output frequencies (50Hz, 60Hz, 400Hz, etc.). Our frequency converters are available as mobile, towable, bridgemount or freestanding units to standards including MIL-STD-704F, MIL-STD-810, MIL-STD-461 and others. We are a regular manufacturer of static frequency converters, solid state frequency converters, 400Hz frequency converters, and custom frequency converters.

All Frequency Converters are Equipped with DSP

All of PCTI's solid state frequency converters are equipped with a sophisticated control system utilizing digital signal processor (DSP) control based on IGBT PWM technology. This superior next-generation control allows us to provide a single control board solution for frequency converters, thus increasing reliability by reducing control components.

Custom Frequency Converters Designed for You

PCTI's custom frequency converters include a 6 pulse input rectifier, IGBT based on a DSP PWM technology (digital signal processor, pulse width modulated). A variety of computer interfaces are available to meet all of your inverter programming and control requirements. For more information, contact PCTI about our solid state frequency converters for more details. If you need help in specifying your frequency converter, request a quote or download our frequency converter brochure.

Standard Specifications

The following specifications outline PCTI's frequency converter product line. Please contact PCTI for options not listed here or for assistance regarding your particular application.


  • Input Service: Any 3 Phase AC Input
  • AC Input Frequency: 60Hz or 50Hz typical, 400Hz, contact the factory for others
  • Efficiency: 85% at full load
  • Power Factor: 0.8 to unity at full load and nominal input


  • Power Range: 10KVA to 2MVA
  • Output Service: Any voltage
  • AC Output Frequency: 400Hz, 50Hz, 60Hz or others on request
  • Frequency Regulation: + 0.05%
  • Regulation: 1% independent phase regulation for combined no load to full load at rated input voltage change
  • Control Technology: Digitally Synthesized Pulse Width Modulation
  • Wave Shape: Pure Sinewave
  • Crest Factor: 1.41 + 0.1%
  • Transient Response: 500 ms for a 90% load change on any phase or combination of phases
  • Current Limit: 110% of load
  • THD (Total Harmonic Distortion): less than 2% THD, 1% on any single frequency, less than 4% for non-linear loads
  • Power Factor: 0.9 lead to 0.7 lag. Continuous zero lead to zero lag at full rated output without damage to the unit.
  • Overload capacity: 125% for 10 minutes, 150% for 2 minutes, 200% for 20 seconds and 300% for 6 seconds

Standard Features

  • Automatic Line Drop Compensation
  • Automatic Input Line Monitoring
  • Built in Test and Protection Monitoring
  • MIL-STD-704F Compliant
  • MIL-STD-461 Compliant for EMI/RFI
  • Standard conformance to IEC, NEMA, NEC, IEEE and other Mil-Spec
  • Indoor or outdoor enclosures


  • Input Circuit Breaker
  • Output Circuit Breaker
  • Output Contactor
  • E&F Interlock with bypass feature
  • Overvoltage
  • Undervoltage
  • Overcurrent/Overload will withstand output short circuit cleared by internal circuitry
  • Output Underfrequency
  • Overtemperature
  • Input to output transformer isolation

Standard Front Panel Devices

  • Power ON Indicator
  • Run indicator
  • Undervoltage indicator
  • Overvoltage indicator
  • Voltage trim adjust from 45% to 105%
  • Start pushbutton
  • Stop/Reset pushbutton
  • Fault indicator
  • Output Voltmeter w/3 Phase selector switch
  • Output Ammeter w/3 Phase selector switch


  • NEMA Enclosure Types: 1, 3R, 12, 4, 4X
  • Enclosure types: mobile, towable, bridgemount or freestanding
  • Operating Temperature: -5°C to 40°C
  • Storage Temperature: -10°C to 65°C
  • Humidity: up to 98% non condensing at 40°C

Computer Interface / Remote Capability

  • Analog Signals: 4-20mA, 0-5V, 0-10V or
  • Computer Interface: ethernet, profibus, Modbus, CANbus, IEEE 488.2/GPIB, RS232, RS485
  • Functions: Start/Stop, Reset, Fault, Inhibit, Current Adjust, Voltage Adjust,
  • Fault Indication (UV, OV, OC, other)

Optional Features

  • Power Factor Correction
  • Audible Alarm
  • Frequency Meter
  • Elapsed Time Meter
  • Mobile unit (pneumatic tires or casters depending on rating)
  • Dual output
  • Multiple selectable input voltages
  • Emergency Mushroom OFF switch
  • Electrical door interlock with bypass
  • Cable racks for input and/or output cables
  • Aircraft cables and plugs
  • 400Hz Distribution Panels