FCOG61BP Bi-Polar Firing Board
Three-phase, Six-SCR Firing Board
The FCOG61BP firing board is based on the FCOG6100 three-phase, six-SCR firing board. It features an additional set of six gate outputs and a polarity transition circuit, allowing users to easily realize four-quadrant rectifier and series-reversing AC controller circuit topologies.
The FCOG6100 provides economical and reliable phase-angle control of SCR AC controllers and DC converters operated from three-phase mains. The 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.
Applications
Typical applications for the FCOG6100 include plating rectifiers, battery chargers, wind turbine controllers, DC motor drives, semiconverters, UPS systems, and transformer primary controllers.
Operational Features
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).
Key Features
- Industry Standard Digital LSI-Based Design
- Analog Delay Angle Command Signal (SIG HI) 0-5 V, 4-20 mA, or custom ranges
- Soft-Start and Soft-Stop
- Polarity Transition Command with Configurable Dead Time
- Instant Enable and Inhibit
- 50/60 Hz Frequency Operation (no adjustment needed)
- High Current Picket Fence Gate Drive
- Gate Drive Isolation: 600Vac
- Power-On Reset
- Analog Delay Determinator Circuit
- Simple Control Power Connection
- Assembled in the USA
Applications
- Controlled Reversing Rectifier (Four-Quadrant)
- Sequence Reversing AC Controller
Product GuideTechnical Details
The FCOG61BP 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, 4-20 mA, or custom ranges.
- 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.
- 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.
- 50/60 Hz Frequency Selection: Operation from 50 or 60 Hz mains.
- High Current Picket Fence Gate Drive: The transformer-isolated gate drive circuits provide a hard firing initial 15 V open circuit/1.5 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 256 times the mains voltage frequency.
- Power-On Reset: A special circuit prevents unintentional SCR gating upon board power-up.
- Analog Delay Determinator Circuit: Enerpro’s gate delay determinator circuit is based on an analog PLL circuit and implemented with a proprietary ASIC. This circuit adjusts the gate delay firing angle in negative proportion to the SIG HI delay angle command signal.
- Board Construction: All circuit boards are assembled at the Enerpro plant in Goleta, California and are manufactured by a UL-approved fabricator from 2.4 mm thick FR4 fire resistant fiberglass epoxy laminate. All boards are conformal coated (MIL-1-46058, Type UR).
