FCOG6100 Standard Firing Board

FCOG6100 Standard Firing Board

The FCOG6100 provides economical and reliable SCR phase-angle control of AC controllers and DC converters operated from three-phase mains. The firing board features six isolated gate drives, independently configurable soft start/soft stop control inputs, and an analog delay angle command input configurable for a variety of common voltage or current ranges. A variety of current and voltage regulator boards are available in addition to auxiliary firing boards for remote or parallel SCR arrangements.


Key Features

  • Industry Standard ASIC-Based Design
  • Analog Delay Angle Command Signal (SIG HI): 0-5 V, 0-10 V, 4-20 mA, or custom ranges.
  • Power-On Reset: Prevents unintentional SCR gating upon board power-up.
  • Soft-Start and Soft-Stop
  • Phase Loss Inhibit
  • Instant Enable and Inhibit
  • Drive Isolation 600Vac
  • Isolated Gate Circuit
  • Phase Sequence Insensitivity
  • Enhanced Frequency Insensitivity
  • High Current Picket Fence Gate Drive
  • Analog Delay Determinator Circuit
  • Flexible Control Power Options: On-Board Voltage Pickup or External Connector for following Control Power: 30Vdc, 24Vac, 120Vac, 260Vac, 380Vac, 480Vac
  • Manufactured in the USA


  • Plating Rectifiers
  • Battery Chargers
  • Wind Turbine Controllers
  • DC Drives
  • Semiconverters
  • UPS Systems
  • Transformer Primary Controllers


Technical Details

The FCOG6100 includes the following features:

  • Analog Delay Angle Command Signal (SIG HI): Users may choose a variety of DC control signal ranges including 0-5 V, 0-10 V, 4-20 mA, or custom ranges.
  • Power-On Reset: A special circuit prevents unintentional SCR gating upon board power-up.
  • Soft-Start and Soft-Stop: Upon soft-start, SCR firing is enabled and the delay angle command ramps from the maximum value to the setpoint value determined by the SIG HI command signal. Upon soft-stop, the delay angle ramps from the setpoint value to the maximum value after which SCR firing is inhibited.
  • Phase Loss Inhibit: A phase loss circuit instantly inhibits SCR firing if a loss of one or more phases or gross phase imbalance is sensed on the AC line. Firing will soft-start when such a fault is cleared.
  • Instant Enable and Inhibit: A contact closure (relay, switch, transistor) instantly enables or inhibits SCR firing at the delay angle commensurate with the SIG HI command signal.
  • Phase Sequence Insensitivity: SCR gating is unaffected by mains voltage phase sequence.
  • Enhanced Frequency Insensitivity: A new compensation circuit reduces delay angle variance with respect to frequency. The gate drive angle decreases approximately 5° for a frequency change from 60 to 50 Hz, whereas the delay angle of previous configurations decreased 12.5° over the same frequency range.
  • High Current Picket Fence Gate Drive: The transformer-isolated gate drive circuits provide a hard firing initial 15 V open circuit/1.8 A short circuit firing pulse followed by sustaining “back porch” pulses at 7 V open circuit/0.5 A short circuit. The gate pulse burst frequency is 384 times the mains voltage frequency.
  • Analog Delay Determinator Circuit: Enerpro’s gate delay determinator circuit is based on the Ainsworth three-phase PLL circuit and implemented with a proprietary ASIC. This circuit adjusts the gate delay firing angle in negative proportion to the SIG HI command. Gate drive phase balance is typically less than ±1°
  • Flexible Control Power Options: The FCOG6100 may be powered from an external 30 VDC or 24 VAC source. With the addition of an onboard transformer, the board may be powered from a 120 V, 240 V, 380 V, or 480 V external source. Board power may also be obtained directly from the connections to the SCR cathodes.
  • Board Construction: All circuit boards are assembled at the Enerpro plant in Goleta, California and are manufactured by a UL-approved fabricator from 0.093-inch thick FR4 fire resistant fiberglass epoxy laminate. All boards are conformal coated (MIL-1-46058, Type UR).
Configure Your Board

    Company (required)

    FCOG6100 Three-Phase Six SCR Firing Board

    SCR Circuit Type

    01 = Six SCR AC Controller
    02 = Parallel SCR AC Controller
    03 = Two-Quadrant, Parallel SCR DC Converter
    04 = Two-Quadrant, Six-SCR DC Converter

    Parallel SCR's

    0 = No
    1 = Yes (Auxillary firing board required for parallel SCR's)

    Mains Frequency

    5/6 = 50 or 60 Hz
    40 = 400 Hz
    Other - please specify

    Command Signal

    1 = 0 - 5 V
    2 = 0.85 - 5.85 V
    3 = 0 - 10 V
    4 = 1 - 2 V
    5 = 4 - 20mA
    Other - please specify

    Used with Regulator Board

    0 = No
    1 = Horizontal Header
    2 = Vertical Header

    SCR Mains Voltage

    03 = 30 V
    12 = 120 V
    24 = 240 V
    30 = 300 V
    38 = 380 V
    40 = 400 V
    48 = 480 V
    60 = 600 V
    Other - please specify

    On-Board Transformer Primary Voltage

    0= Omit Transformer (Customer must supply 24Vac or 30VDC for board control power)
    1= 120-240 Vac
    2= 240-480 Vac
    3= 350 Vac
    4= 380 Vac

    On-Board Transformer Power

    0= Not Installed
    1= External Source
    2= SCR Cathodes

    Phase References

    1= On-Board
    2= External via J5, R6, R7 & R8 .Connect ac mains via J5 (to be attenuated by R6, R7 & R8) to provide phase out references.

    Special Requirements:


    Enerpro, Inc.
    Global Headquarters
    99 Aero Camino
    Goleta, CA 93117


    Tel: (805) 683-2114
    Fax: (805) 964-0798


    ICT Power Company Inc.
    1220 Corporate Dr.
    Burlington, ON L7L 5R6


    Tel: 905.631.8494
    Fax: 905.631.8495


    MPE Cathodic AS
    P. O. Box 74
    N1581 Rygge, Norway
    Marine & Offshore
    Jotun ICCP Specialists

    Tel: +47 69 23 29 00
    Fax: +47 69 23 29 01
    Mob: +47 95 11 81 82


    Andrew Chettle
    Power Products International Limited
    Commerce Way
    Kent TN8 6ED

    Tel: 01732 866424
    Fax: 01732 866399


    Bruno Passerini
    G.P.S. – Green Power Solutions SRL
    Via Venezia 34D
    10088 Volpiano – Torino

    Tel: +39 011 9882251
    Fax: +39 011 9881358


    Design Support
    In-Service Support
    Toll Free: (877) 648-2114
    (805) 683-2114

    Sales Policy
    RMA Policy


    Jane Lu
    Tackoh Enterprises (HK)
    Room 1604, Arion Commercial Centre
    2-12 Queen’s Road, West
    Hong Kong

    Tel: 852 2543 0186
    Fax: 852 2542 2114
    Mob: 852 9379 8172


    Andes Controls, Power and Automation
    Cristián Ladisla Bohn
    Av. Holanda 099, Oficina 1101
    Providencia, Santiago, Chile

    Tel: +56 2 2306 6202


    Akom Chantakhun
    CBC International Limited
    56/12-13 Soi Prayasuren 45
    Samwatawantok, Klongsamwa
    Bangkok, 10510

    Tel: 662 902 6106-9
    Fax: 662 914-3009