The GE IS200DSFCG1ACA Driver Shunt Feedback Board is a specialized gate driver and current feedback module used within GE Industrial Control Systems Innovation Series™ Pulse Width Modulated (PWM) source bridges and AC drives. The IS200DSFCG1ACA Driver Shunt Feedback Board contains a current sensing circuit, a comprehensive fault detection circuit, and two isolated IGBT gate drive circuits, all integrated onto a single compact board that mounts directly to the IGBT modules. The driver and feedback circuits are both galvanically and optically isolated, ensuring safe and accurate operation in the high-voltage environment of the drive power bridge.
The IS200DSFCG1ACA Driver Shunt Feedback Board is designed specifically for use with the 1000 Amp and 1800 Amp Innovation Series™ PWM source bridges and AC drives. The board interfaces to the drive control system via the IS200BPIB Drive Bridge Personality Interface Board (BPIB), which provides the control signals and power to the gate driver circuits and receives the fault and current feedback signals from the shunt monitoring circuits. A 1000 A source bridge or drive requires three IS200DSFCG1ACA Driver Shunt Feedback Boards, one per phase. An 1800 A source bridge or drive requires six IS200DSFCG1ACA Driver Shunt Feedback Boards, with two "daisy chained" boards per phase, allowing the gate drive and current sensing functions to be shared across two boards for the higher current rating.
The IS200DSFCG1ACA Driver Shunt Feedback Board (G1 group) is designed for use in drive and source applications where the AC input is 600 V line-to-line RMS. The board is mounted directly to the upper and lower IGBT modules in each phase leg to keep driver output and shunt input connections as short as possible, minimizing parasitic inductance and noise pickup. The board is held in place by the gate, emitter, and collector connections to the IGBT, with proper orientation of the board essential for correct positioning of the gate, emitter, and collector mounting holes.
The IS200DSFCG1ACA Driver Shunt Feedback Board is identified by the GE part numbering convention used throughout the Industrial Control Systems product line. The "IS200" prefix identifies the board as a GE Industrial Control Systems product, with "200" specifically indicating that the board is a base-level assembly. The "DSFC" acronym identifies the board's functional designation as an IGBT Gate Driver/Shunt Feedback board. The "G1" designation identifies the hardware group and normal coating, while the "ACA" suffix identifies the artwork and functional revision combination. All digits are important when ordering or replacing any board, as boards of different revision levels may not contain identical hardware, and GE ensures backward compatibility of replacement boards while noting that different revision levels may not contain identical components.
This product introduction provides detailed technical information, functional descriptions, connector assignments, configuration guidance, and comprehensive specifications for the GE IS200DSFCG1ACA Driver Shunt Feedback Board, serving as an essential reference for drive engineers, maintenance technicians, and system integrators working with GE industrial control equipment.
Functional Architecture and Signal Processing
The IS200DSFCG1ACA Driver Shunt Feedback Board is built around a robust architecture for IGBT gate driving, current sensing, fault detection, and isolated signal transmission. The board performs several distinct functions that together ensure reliable and accurate control of the IGBT power bridge and precise measurement of the output phase current.
The primary function of the IS200DSFCG1ACA Driver Shunt Feedback Board is the gate drive function for the IGBT modules. Each of the two isolated IGBT gate drive circuits on the board drives two paralleled IGBT modules. One circuit controls the upper IGBTs of a phase leg, while the other controls the lower IGBTs. These circuits drive the IGBT gate between VCC (+15 V) and VEE (−15 V) (IGBT emitter common) and have the capability to sink or source a maximum of 20 amps peak. The IS200DSFCG1ACA Driver Shunt Feedback Board gate drive circuits are designed to operate at a maximum PWM chopping frequency of 6 kHz, suitable for the switching requirements of the Innovation Series™ drives.
The drive control optocoupler input diodes are connected in an anti-parallel configuration that provides upper and lower drive control from a common differential twisted pair control line. This arrangement reduces the number of control lines required and simplifies the interface to the BPIB board. The gate series resistors and gate-emitter capacitors on the IS200DSFCG1ACA Driver Shunt Feedback Board are sized specifically for the IGBT module, ensuring optimal switching performance and minimal losses.
Each gate driver output on the IS200DSFCG1ACA Driver Shunt Feedback Board is monitored, and the state is indicated by a green and a yellow LED. The yellow LED will be ON when the IGBTs are driven ON, while the green LED will be ON when the IGBTs are driven OFF. This visual indication allows maintenance personnel to quickly verify the operating state of each gate driver circuit.
Two types of faults can be detected by the driver circuits on the IS200DSFCG1ACA Driver Shunt Feedback Board: Desaturation and Undervoltage. These faults are reported through one "multiplexed" differential fault line for both upper and lower IGBT circuits, reducing the number of interface signals required.
Desaturation fault detection is a critical protective function of the IS200DSFCG1ACA Driver Shunt Feedback Board. When the driver is commanded to turn the IGBT ON, the voltage drop between the emitter and collector of the IGBT is monitored. If this voltage exceeds 10 V for 4 microseconds, a desaturation fault will be enunciated. An RC integrator with a 4 microsecond time constant in the desaturation monitor circuit prevents erroneous desaturation faults caused by noise or transient conditions. When a desaturation fault occurs, the BPIB board operates the IS200DSFCG1ACA Driver Shunt Feedback Board in a "burst" mode where a 2 MHz PWM signal is used to slowly bring the gate voltage down to zero (within 2 to 5 microseconds), providing a controlled turn-off that minimizes the risk of damage to the IGBT.
Undervoltage fault detection is also provided on the IS200DSFCG1ACA Driver Shunt Feedback Board. The voltage between the positive driver power supply (+15 V, MLP15 and MUP15) and negative driver power supply (−15 V, MLN15 and MUN15) is monitored. If the voltage between the +15 V and −15 V supplies drops below 20 V, an undervoltage fault will occur. This protection ensures that the IGBT is not driven with insufficient gate voltage, which could cause excessive power dissipation and potential device failure.
These two faults (desaturation and undervoltage) are logically ORed together and optically coupled to a differential driver interface to the control logic. The optocoupler in the OK state will be ON (output low). Reversing the 5 V polarity will turn OFF the device that was ON and turn ON the driver that was OFF. When the drive is initially powered up, both control lines are held at the same potential in order to set the upper and lower gate drive circuits in the OFF state. Also, when the drive is operating, both control lines are held at the same potential for a period of time (dwell time) to assure that the upper or lower IGBTs of a phase leg have turned OFF before others are commanded to turn ON. The dwell time is controlled by the BPIB board, ensuring safe commutation of the phase leg.
The second major function of the IS200DSFCG1ACA Driver Shunt Feedback Board is shunt current feedback. Output phase current is monitored by deriving a VCO output signal from the voltage dropped across the phase shunt. This voltage is amplified and then passed on to the VCO circuitry. The VCO has a range of 0–2 MHz, and the circuit is biased so that at zero current the nominal output is 1 MHz. A ±200 mV shunt voltage is converted into a ±800 kHz change in the VCO output frequency. The output of the VCO is optically coupled to a differential driver interface to the control logic, ensuring accurate and noise-immune transmission of the current feedback signal.
Two faults can be generated by the current feedback circuit on the IS200DSFCG1ACA Driver Shunt Feedback Board: DI/DT and Instantaneous Overcurrent (IOC). A DI/DT fault is generated when a 100% or greater step change of the rated shunt current occurs, and this fault is reported within 25 microseconds. An IOC fault is reported if the current exceeds a predetermined instantaneous threshold. These protective functions ensure that the drive is protected from overcurrent conditions and rapid current transients that could damage the IGBTs or the load.
Power Supplies
The power supply architecture of the IS200DSFCG1ACA Driver Shunt Feedback Board is designed to provide isolated, regulated power to the gate drive circuits, the shunt current feedback circuits, and the fault detection circuits. The high-voltage side of each of the driver/monitor circuits is powered by an isolation transformer, ensuring galvanic isolation between the control side and the high-voltage power side.
The primary of the isolation transformer is connected to a ±17.7 volt peak (35.4 volt peak-to-peak), 25 kHz square wave. Two of the three secondaries are halfway rectified and filtered to provide the isolated +15 V (VCC) and −15 V (VEE) required by the upper and lower IGBT driver circuits. These supplies are unregulated, with ±5% tolerance and 1 A average maximum for each voltage. The third secondary is full-wave rectified and filtered to provide an isolated ±12 V required by the shunt current feedback VCO and fault detection circuitry, with ±10% tolerance and 100 mA average maximum for each voltage.
The shunt circuit also requires a light 5 V logic supply that is generated by a 5 V linear regulator connected to the +12 V supply. This supply has ±10% tolerance and 100 mA average maximum. Only the 5 V power supply is regulated; the other supplies are unregulated but filtered to provide acceptable ripple and noise performance.
The maximum load on the IS200DSFCG1ACA Driver Shunt Feedback Board power supplies is as follows: ±17.7 V at 0.65 A RMS, and +5 V at 150 mA. These ratings ensure that the board can supply the required power to the gate drive circuits and the feedback circuits under all operating conditions.
Connector Assignments and Interfaces
The IS200DSFCG1ACA Driver Shunt Feedback Board provides a comprehensive set of connectors that interface with the IGBT modules, the BPIB board, the current shunt, the RTD sensors, and the daisy-chained DSFC board in 1800 A applications. Each connector serves a specific function in the overall signal chain, and understanding these connector assignments is essential for installation, maintenance, and troubleshooting.
The DC link voltages and the output phase voltage sensing line are connected to stab-on terminals on the IS200DSFCG1ACA Driver Shunt Feedback Board. The E1 stab provides the output phase voltage sensing line (MVFB), the E17 stab provides the DC link voltage positive (DCLP), and the E18 stab provides the DC link voltage negative (DCLN). These stab connections provide reliable, low-impedance connections for the high-voltage signals.
All connections to the IGBTs are made with the mounting hardware through the mounting eyelets in the IS200DSFCG1ACA Driver Shunt Feedback Board. The eyelet connections include the upper collector link positive (UC), the upper A device gate (UGA), the upper A device emitter (UEA), the upper B device gate (UGB), the upper B device emitter (UEB), the lower A device gate (LGA), the lower A device emitter (LEA), the lower B device gate (LGB), the lower B device emitter (LEB), and the lower emitter link negative (LE). These eyelet connections are secured with captive fasteners and are torqued to 70 inch-pounds during installation.
All other inputs and outputs for the IS200DSFCG1ACA Driver Shunt Feedback Board are made at eight plug connectors: PPL1, PPL2, SHPL, THPL, THPL1, THPL2, DPPL1, and DPPL2. The PPL1 connector provides the phase interface I/O with the IS200BPIB Drive Bridge Personality Interface Board, carrying the shunt VCO positive and negative signals, the shunt fault positive and negative signals, the upper fault negative and lower fault positive signals, the interface +5 V and common, and the upper and lower drive signals. The PPL2 connector provides the phase interface I/O with the daisy-chained IS200DSFCG1ACA Driver Shunt Feedback Board in 1800 A applications, carrying the same signals from the second board.
The SHPL connector provides the shunt input connection to the current shunt, with pin 1 providing the shunt motor side connection (MSHM) and pin 2 providing the shunt bridge side connection (MSCOM). The THPL, THPL1, and THPL2 connectors provide the resistance thermal detector (RTD) connections to the RTD or pass-through connection to the BPIB for the daisy-chained IS200DSFCG1ACA Driver Shunt Feedback Board in 1800 A applications. The DPPL1 and DPPL2 connectors provide the 18.4 V AC peak squarewave power connection from the BPIB or pass-through connection from the BPIB for the daisy-chained board.
LED Indicators
The IS200DSFCG1ACA Driver Shunt Feedback Board includes five LED indicators (DS1, DS2, DS3, DS4, and DS5) that provide visual indication of the DC link status and the upper and lower IGBT driver status. DS1 is the LINK ABOVE 50V link monitor red LED, which is ON when the DC link is greater than 50 V and OFF when the DC link is less than 50 V. This indicator provides a clear warning of the presence of hazardous voltage on the DC link.
DS2 is the upper driver monitor green LED (UFF), which is ON when the upper IGBTs are driven OFF and OFF when the upper IGBTs are driven ON. DS3 is the lower driver monitor green LED (LFF), which is ON when the lower IGBTs are driven OFF and OFF when the lower IGBTs are driven ON. DS4 is the upper driver monitor yellow LED (UON), which is ON when the upper IGBTs are driven ON and OFF when the upper IGBTs are driven OFF. DS5 is the lower driver monitor yellow LED (LON), which is ON when the lower IGBTs are driven ON and OFF when the lower IGBTs are driven OFF. These indicators allow maintenance personnel to quickly verify the operating state of each gate driver circuit and to diagnose gate drive faults.
Application Data and Configuration
The IS200DSFCG1ACA Driver Shunt Feedback Board contains plug and stab-on connectors, mounting eyelet connectors to the IGBT, and LED indicators as part of the board. There are no configurable hardware items or fuses on the board, simplifying installation and reducing the potential for configuration errors. The board is factory-configured for the specific IGBT module and application, and no field adjustment is required.
The board is mounted directly to the upper and lower IGBT modules in each phase leg to keep driver output and shunt input connections as short as possible. The board is held in place by the gate, emitter, and collector connections to the IGBT, with proper orientation of the board essential for correct positioning of the gate, emitter, and collector mounting holes. The mounting hardware is secured with ten nuts at the eyelet connections, torqued to 70 inch-pounds.
Application Suitability and System Integration
The IS200DSFCG1ACA Driver Shunt Feedback Board is an integral component of GE's Innovation Series™ PWM source bridges and AC drives, providing the gate drive and current feedback functions that are essential for the operation of the IGBT power bridge. Its applications include 1000 A and 1800 A source bridges and drives, where the board's compact size, high isolation, and robust fault detection capabilities ensure reliable and safe operation.
In 1000 A applications, three IS200DSFCG1ACA Driver Shunt Feedback Boards are used, one per phase. Each board drives the upper and lower IGBTs of its phase leg and provides current feedback from the phase shunt. In 1800 A applications, six boards are used, with two daisy-chained boards per phase. The daisy-chaining allows the gate drive and current sensing functions to be shared across two boards, providing the additional current capability required for the higher power rating.
The IS200DSFCG1ACA Driver Shunt Feedback Board interfaces to the drive control system via the IS200BPIB Drive Bridge Personality Interface Board, which provides the control signals and power to the gate driver circuits and receives the fault and current feedback signals from the shunt monitoring circuits. The BPIB board also controls the dwell time between upper and lower IGBT switching transitions, ensuring safe commutation of the phase leg.
The board's desaturation and undervoltage fault detection functions provide critical protection for the IGBTs, preventing damage from overcurrent conditions, insufficient gate drive voltage, and other fault conditions. The DI/DT and IOC fault detection functions provide additional protection for the drive and the load, ensuring that overcurrent conditions are detected and reported within the required response time.
Maintenance and Lifecycle
The IS200DSFCG1ACA Driver Shunt Feedback Board is designed for long service life with minimal maintenance. The board contains no moving parts or user-adjustable components, and its solid-state construction ensures high reliability in continuous industrial operation.
Routine maintenance consists of periodic visual inspection of the board, connectors, and mounting hardware. The LED indicators should be checked to verify correct operation of the gate drivers and the DC link voltage monitor. The mounting nuts at the eyelet connections should be checked for proper torque (70 inch-pounds), and the plug connectors should be inspected for signs of damage, loose connections, or contamination.
If a board fails, replacement is straightforward but requires careful attention to safety procedures. After turning off all power to the drive and waiting several minutes for all capacitors to discharge, test any electrical circuits before touching them to ensure the power is off. Disconnect all cables from the IS200DSFCG1ACA Driver Shunt Feedback Board, verifying that cables are labeled with the correct connector name. Remove the ten nuts at the eyelet connections that secure the board to the IGBTs, taking care to avoid dropping mounting hardware into the unit. Remove the old board from the mounting studs of the IGBTs, orient the new board in the same position, and secure with the ten nuts torqued to 70 inch-pounds. Reconnect all cables as labeled, ensuring that cables are properly seated at both ends, and close all drive and equipment cabinet doors.
GE Industrial Control Systems ensures compatibility of its replacement boards, even though boards of different revision levels may not contain identical hardware. When ordering a replacement IS200DSFCG1ACA Driver Shunt Feedback Board, provide the complete part number and description, the drive serial number, and the drive Material List (ML) number. The factory may substitute later versions based on availability and design enhancements, but backward compatibility of replacement boards is guaranteed.
Conclusion
The GE IS200DSFCG1ACA Driver Shunt Feedback Board is a reliable, robust, and highly integrated gate driver and current feedback module for GE Innovation Series™ PWM source bridges and AC drives. Its comprehensive gate drive, fault detection, current sensing, and isolated signal transmission capabilities ensure accurate and safe control of the IGBT power bridge, while its compact size and direct mounting to the IGBT modules minimize parasitic inductance and noise pickup. The board's desaturation, undervoltage, DI/DT, and IOC fault detection functions provide critical protection for the IGBTs and the drive, ensuring high system reliability and availability.
With its standard connectors, clearly marked LED indicators, and comprehensive fault reporting, the IS200DSFCG1ACA Driver Shunt Feedback Board is an essential component in countless industrial drive installations worldwide. Backed by GE's quality manufacturing, global support network, and commitment to backward compatibility, the IS200DSFCG1ACA Driver Shunt Feedback Board continues to deliver the performance, durability, and ease of use that industrial users expect from GE. Whether used in a new installation or as a replacement for an existing board, the IS200DSFCG1ACA Driver Shunt Feedback Board provides the gate drive and current feedback functionality required for reliable and efficient industrial drive control.
