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Frequency Converter | Line Drop Compensators / Gate Box

The FCX Line Drop Compensator (LDC) is designed to cancel out the inductive voltage drop in 400Hz transmission lines. Voltage drop in the cables carrying 400 Hz power is much greater than if the same cable were carrying 60 Hz power. Left uncorrected, the aircraft may reject the power feed due to low voltage. The LDC is connected in series with the cable run to the 400Hz Service Point and improves voltage by cancelling out the voltage drop due to 400Hz AC reactance of the cable. The LDCs are available in ratings with up to 20% compensation capability.
  • Ratings Available - 15 KVA through 180 KVA
  • Efficiency - approximately 99%
  • NEMA 3R equivalent enclosure
  • Over boosting protection
  • DC power supplies for electronics and alarm
  • Switch gear interlocking capabilities
  • Cabinet grounding connection for bonding
  • Conformal coated circuit boards
  • Stackable
60kva-180kva Gates boxes with LDC. LDC's of various sizes for all applications
  • Input

    Input Voltage: 115 V through 960 V RMS ± 1%, 3 phase, 400 Hz
    Protection: LDC overcurrent, short circuit, over boost, over/under voltage (as required by application)
  • Environmental

    Ambient Temp. Range: Operating: -40°C to +50°C
    Air Storage: -40°C to +60°C
    Humidity: 10% to 100%
    Altitude: 0 to 3,000 meters without derating
    Enclosure Rating: NEMA 3R equivalent
  • Output

    Line Drop Compensation: 6% to 16% ± max. (6 user taps) 6% to 20% ± max. (8 user taps)
    Tap Increments: 2% increments
    Output Phase: 3 Phase, 3 & 4 wire systems, ABC (clockwise rotation)
  • Codes & Standards

  • Ordering Information

    Model Number: LDC (1)-(2)-(3) (Create model number using items 1, 2 and 3 as shown.)
    1. Select KVA rating: 015, 025, 030, 045, 060, 090, 120, 140, 150, or 180 KVA
    2. Select input voltage: L = 115, M = 200/115, N =208/120, O = 240, P = 380/220, Q = 400/231, R =415, S = 440, T = 480, U = 575, V = 600, W = 960
    3. Maximum Line Drop Compensation: 16% or 20%
  • Output KVA Ratings:

    15, 25, 30, 45, 60, 90, 120, 140, 150 and 180 KVA continuous duty
  • Controls

    Output overload adjust, alarm reset push button
  • indicators

    Overload, Short Circuit (on Circuit Board)
  • Connections

    Pressure type terminal blocks designed for oversized wiring normally associated with 400Hz Systems



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Powering F-35s Aboard Aircraft Carriers Anticipating the deployment of F-35 airplanes aboard aircraft carriers, the U.S. Navy issued a requisition for development of a system to feed power to 400 Hz AC and 270 VCD aircraft with a minimum impact on the existing equipment and space. FCX used its experience with the 400 Hz AC […]


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