The GE DS200DCFBG1BEB Power Supply Board is a critical power conversion and signal conditioning module used across a wide range of GE Industrial Control Systems drive and exciter platforms. As a member of the DCFB board family, the DS200DCFBG1BEB receives 38 V AC and 115 V AC (or 24 V DC) input power from the control power transformer and generates all control-level power required by the drive system, while simultaneously providing voltage and current feedback signals, motor field power circuits, SCR gate pulse drive circuits, and AC line monitoring functions. The DS200DCFBG1BEB is the B revision level of the DCFB board, designated by the "G1B" group and revision code within the part number structure, and incorporates functional changes that are backward compatible with earlier revisions.
The DS200DCFBG1BEB Power Supply Board is deployed in DC2000, CB2000, EX2000, FC2000, GF2000, ME2000, and AC2000 IGBT drive applications. In the EX2000 excitation control platform, the DS200DCFBG1BEB serves a different purpose than in drive applications, and application-specific information is distinguished accordingly in the technical documentation. This versatility demonstrates the board's fundamental importance to GE's industrial control ecosystem, where a single power supply platform supports multiple product families with differing requirements.
The primary function of the DS200DCFBG1BEB Power Supply Board is to convert raw AC input power into regulated, isolated DC voltages that power the drive's control electronics. These outputs include +5 V DC, ±15 V DC, and ±24 V DC, all derived from the rectified and filtered 38 V AC input. The board also provides isolated +5 V and ±15 V DC supplies specifically for the armature current feedback circuits, ensuring accurate measurement even in the presence of high common-mode voltages. In addition to power conversion, the DS200DCFBG1BEB integrates voltage-controlled oscillator circuits, motor voltage attenuation, AC line magnitude and zero-crossing detection, AC current transformer interface, contactor drive circuits, and SCR firing control logic, making it a comprehensive power and signal interface solution.
This product introduction provides detailed technical information, functional descriptions, configuration guidance, diagnostic features, and comprehensive specifications for the GE DS200DCFBG1BEB Power Supply Board, serving as an essential reference for drive engineers, maintenance technicians, and system integrators working with GE industrial control equipment.
Power Supply Architecture
The power supply section of the DS200DCFBG1BEB Power Supply Board forms the foundation of its operation, converting raw input power into the multiple regulated voltages required by the drive control system. The board receives 38 V AC (±10%) from the control power transformer, which is then full-wave rectified and filtered to produce unregulated ±24 V DC outputs. The +24 V DC output is rated at 3 A, while the −24 V DC output is rated at 1 A, providing substantial current capacity for the drive's control circuitry and auxiliary loads.
From these unregulated ±24 V DC rails, precision regulators on the DS200DCFBG1BEB derive ±15 V DC supplies. Each of the ±15 V DC outputs is rated at 0.8 A, of which 0.25 A is available for external loading by other boards in the system. This external capacity is important because the ±15 V DC rails are distributed to the SDCC/LDCC (Drive Control Card), SLCC (Logic Control Card), and NTB/3TB or STBA terminal boards, powering analog signal conditioning, operational amplifiers, and interface circuits throughout the drive.
The DS200DCFBG1BEB also generates a +5 V DC output rated at 4 A from the +24 V DC supply. This high-current rail powers the digital logic, microprocessors, gate arrays, and memory devices on the drive control cards. A critical supervisory signal, /PSEN (Power Supply Enable), is provided on connector 2PL. The /PSEN signal transitions to a TTL low state when the +5 V DC supply is in regulation; if the +5 V DC output goes out of regulation, /PSEN goes high, generating a microprocessor reset on the SDCC/LDCC board. This protective feature ensures that the drive control electronics cannot operate with out-of-tolerance power, preventing unpredictable behavior or damage.
For the armature current feedback circuits, the DS200DCFBG1BEB provides isolated +5 V and ±15 V DC supplies. This isolation is essential because the armature current shunts are at the potential of the armature bus, which may be significantly different from the control common. The isolated supplies ensure accurate signal transmission across the isolation barrier without compromising safety or measurement integrity.
The power supply outputs are protected against short circuits by three fuses. Fuses FU2 and FU3 are rated at 7 A, 2AG fast-acting and protect the +24 V and −24 V DC rails respectively. LEDs CR51 and CR55 provide blown-fuse indication for FU2 and FU3 respectively. Fuse FU1 is rated at 1/2 A, 2AG fast-acting and protects the 115 V AC output; neon lamp LT1 provides blown-fuse indication for FU1. These indicators enable rapid diagnosis of power supply faults without requiring test equipment.
Voltage and Current Feedback VCO Circuits
The DS200DCFBG1BEB Power Supply Board incorporates multiple voltage-controlled oscillator circuits that convert analog input voltages into frequency signals, which are then transmitted to the SDCC/LDCC board for processing. Each VCO has a nominal output frequency of 250 kHz, with the output frequency varying from 0 to 500 kHz depending on the input voltage. This frequency-based signal transmission offers excellent noise immunity and allows the drive control to measure voltages and currents with high accuracy across isolation boundaries.
The output bridge VCO circuit provides feedback to the SDCC/LDCC board through connector 1PL, pin 13 (1PL-13). DIP switch SW4 is used to scale the voltage applied to this circuit, accommodating different bridge voltage ratings. A frequency-to-voltage reconstruction circuit provides a diagnostic signal at testpoint TP37 on the SDCC/LDCC board through 1PL-37, allowing the bridge voltage waveform to be viewed on an AC-coupled oscilloscope for troubleshooting and verification.
A second VCO provides feedback of the motor voltage to the SDCC/LDCC board through 1PL-39. DIP switch SW5 scales the voltage applied to this circuit. This motor voltage feedback is essential for motor control algorithms, field weakening, and protection functions. The motor voltage attenuation circuit, biased at 2.5 V, provides an analog representation of the motor voltage that can vary from 0 to 5 V, sent to the SDCC/LDCC board through 1PL-6. DIP switch SW6 scales this analog feedback signal.
Two additional VCO circuits provide feedback of the input voltage from shunts, with output frequency signals sent to the SDCC/LDCC board through connector 1PL. The DS200DCFBG1BEB also includes two motor armature VCO circuits, with frequency output signals sent through 1PL-8 and 1PL-10. These armature VCOs are at the potential of the armature bus and are fed by an isolator, ensuring safe and accurate measurement of armature current in high-voltage drive applications.
AC Line Monitoring and Synchronization
The DS200DCFBG1BEB Power Supply Board contains amplifier circuits that process AC line-to-line voltages for magnitude measurement, phase sequence detection, and synchronization. The voltage feedback signals are sent to the SDCC/LDCC board through 1PL-11, 1PL-12, and 1PL-29. These signals are used to detect power bridge SCR failures and may also be used to derive the synchronization signal for firing the SCRs.
DIP switches SW1, SW2, and SW3 scale the AC line voltage feedbacks. SW1 and SW3 scale the V1-2 and V1-3 line voltage feedbacks into the VCOs, providing the SDCC/LDCC board with frequency signals proportional to instantaneous line voltages. These are used for phase loss and sequence detection, and for line synchronization via the bi-phase phase-locked loop. SW2 scales the V2-3 voltage applied to the circuit used to generate the AC line synchronization and frequency measurement signal via the zero-crossing detector.
The scaling switches must be set in conjunction with the SHVI/SHVM (SCR High Voltage Interface) board's voltage attenuators, if used. The maximum nominal AC voltage ratings range from 308 V AC (all switches off) to 617 V AC (switch position 2), with correspondingly higher ratings when SHVI/SHVM attenuators are employed. For DC2000 applications, switches SW1 through SW6 must all be set to the same position. Above 617 V AC, SHVI/SHVM attenuators must be used. For EX2000 applications, the same setting requirement applies, with SHVI or SHVM attenuation based on IEEE 421.3 hipot requirements.
The AC line synchronization signal (SYNC) is provided to the SDCC/LDCC board through 1PL-29. Proper synchronization to the AC line is critical to the operation of the drive, and jumper JP1 selects the source of this synchronization signal. In position 1-2, the synchronization is generated by the DCFB using line voltage 2-3 for DC2000 and ME2000 applications. In position 2-3, the synchronization is generated by the TCCB card for EX2000 applications. This jumper setting is critical and must be verified during board replacement.
In many drive applications, the AC input lines L1 and L3 include AC line current transformers (ACCTs) that measure the input current for protection and control purposes. The DS200DCFBG1BEB provides an interface for these transformers through connector 1CPL, which accepts the ACCT current inputs from L1 and L3.
DIP switch SW7 on the DS200DCFBG1BEB selects the burden resistance as a function of the rated 1 per unit DC output current. The rated 1 pu DC output current is defined as 0.5 V across the DCFB board's ACCT burden resistors. The switch settings are calibrated according to the CT turns ratio, with supported part numbers ranging from 1000:1 to 8000:1. Correct scaling is essential for proper operation of the instantaneous overcurrent (IOC) protective feature.
The ACCT signals are sent to the SDCC/LDCC board through connector 1PL, where they are used to check for commutation failure and AC instantaneous overcurrent conditions. Testpoint ACCT on the DS200DCFBG1BEB allows the ACCT signals to be viewed during troubleshooting. When properly set, the current magnitude read in VAR.1019 (CTCFB) should be scaled within 15% of the current magnitude in VAR.104 (CFB). Above 144 mA ACCT secondary current, the CTs are routed through a set of 10:1 step-down CTs on the SHVI/SHVM board, using JP1 through JP8 on that board for attenuation selection.
Motor Field and Armature Circuits
The DS200DCFBG1BEB Power Supply Board includes motor field power circuits (excluding the SCR module itself) and driver circuits for the motor field SCR gate pulse generators. These circuits enable the drive to control the motor field current independently of the armature, which is essential for DC motor speed and torque control.
The field SCR firing control circuits receive control signals from the SDCC/LDCC board through connector 1PL. The gate array circuit controls the firing of the SCRs based upon these control signals, with the gate array programmed at power-up by a serial PROM. To prevent spurious firing signals, the firing power is removed from the gating circuits until the gate array is programmed and the 5 V power is being regulated.
The 5 V outputs of the gate array are converted by gate pulse amplifier circuits into the power level required to feed the forward and reverse gate pulse transformers on the DS200PCCA Power Connect Card. These signals are sent to the PCCA board through connector 5PL, which provides individual drive signals for cells 1F through 6F and 1R through 6R (reversing bridges only), along with +24 V outputs for each cell. The field SCR firing signals are provided through 1PL-18 and 1PL-19 for field #1 and field #2 respectively.
The armature SCR enable signals, /ENFWD and /ENREV, are provided through 1PL-17 and 1PL-16 respectively. These signals enable the forward and reverse armature SCR bridges, allowing the drive to control motor direction and regenerative braking. The cell decode signals A14R, A25R, A36R, A14F, A25F, and A36F are provided through 1PL-20 through 1PL-22 and 1PL-24 through 1PL-26, supporting the gating logic for the power bridge.
The DS200DCFBG1BEB Power Supply Board includes relay K2, which serves as a pilot relay for the MD contactor. The SDCC/LDCC board drives the coil of this relay through 1PL-34, 1PL-35, and 1PL-36. Connector MACPL provides 24 V DC FET output to the MD contactor driver, with MACPL-2 and MACPL-4 providing the 24 V DC control power for MD #1 and MD #2 contactors respectively, and MACPL-1 and MACPL-3 providing the control commons.
The MA contactor control output is provided through CNPL-1 (X1) and CNPL-2 (MA115V). Form C contacts from the MA pilot relay K2 are available on connector 4PL: 4PL-3 provides the normally-closed contact (MANC), 4PL-4 provides the normally-open contact (MANO), and 4PL-5 provides the common contact (MACM). These contacts can be used for external interlocking, status indication, or control sequencing.
Jumper JP2 decreases the AC contactor drop-out time. Normally, the circuit delays opening of the AC contactor to ensure all load current has been extinguished. Removal of this jumper (position 0) can cause the control-on circuit to drop out the MA relay before the current has been brought to zero, which may be desirable for minimum delay in certain test or manufacturing scenarios. The normal operating position (1-2) gives about 100 ms delay.
Configurable Jumpers and DIP Switches
The DS200DCFBG1BEB Power Supply Board includes twelve configurable jumpers (thirteen on revision BKC and later boards) and seven DIP switches for selection of customer options. Most jumper and DIP switch selections are factory set, and the test data sheets supplied with each controller show the factory-set positions. When a DS200DCFBG1BEB board is replaced, the jumpers and switches on the new board must be set in the same position as on the board being replaced, unless the instructions state otherwise.
The jumpers are organized into two functional groups. Jumpers JP1 and JP2 control synchronization source selection and AC contactor drop-out time respectively. Jumpers JP3 through JP7 configure the armature shunt #1 input circuit, while JP8 through JP12 configure the armature shunt #2 input circuit. These jumpers must be set together for proper operation of the voltage-controlled oscillators that convert shunt current to frequency signals. JP13, present on revision BKC and later boards, selects the scaling for either a shunt or a field supply shunt.
The application-specific jumper settings are tabulated in the technical documentation, covering drive frames G, C, D, L, M, J, and K for DC2000 and EX2000 applications, as well as GF2000, ME2000, CB2000, and configurations with SVIA or SHVM boards. When JP3 and JP4 are in position 1-2, no attenuation affects the IA1PL input signal, which may come from either a 100 mV (1 pu) shunt or an external VCO. The local VCO produces 0 Hz at −5 pu and 500 kHz at +5 pu from a shunt signal. Putting JP3 and JP4 in position 2-3 rescales the input to receive an analog isolator (SVIA) signal, such that the local VCO produces a frequency output of 12 kHz with −5.0 V input and 488 kHz with +5.0 V input.
The seven DIP switches (SW1 through SW7) control AC line voltage scaling, DC bridge and motor voltage feedback scaling, and ACCT burden selection. Switches SW1, SW2, and SW3 scale the AC line voltage feedbacks for the V1-2, V2-3, and V1-3 circuits respectively. SW4 scales the DC bridge voltage feedback VCO circuit, SW5 scales the DC motor voltage feedback VCO circuit, and SW6 scales the analog DC motor voltage feedback circuit. SW7 selects the AC line current transformer burden as a function of rated drive horsepower and voltage.
For DC2000 and EX2000 applications, switches SW1 through SW6 must all be set to the same position. For GF2000 and ME2000 applications, SW1 through SW4 must be set to the same position, while SW5 and SW6 may be set to different positions depending on the application. Above 617 V AC, SHVI/SHVM attenuators must be used, and the switches are set to scale inputs for a nominal 20,000 counts accordingly.
Indicators, Testpoints, and Fuses
The DS200DCFBG1BEB Power Supply Board includes two red LED indicators (CR51 and CR55) and one neon light indicator (LT1) for fuse status indication. CR51 lights when fuse FU2 in the +24 V DC line to the +15 V DC regulator is blown. CR55 lights when fuse FU3 in the −24 V DC line to the −15 V DC regulator is blown. LT1 lights when fuse FU1 in the 115 V AC line to CNPL-1, CPTPL-2, and FAPL-2 is blown. These indicators provide immediate visual confirmation of fuse status, enabling rapid troubleshooting.
Five testpoints are provided on the DS200DCFBG1BEB to allow checking of voltage signals and ACCT signal status. P5 provides a testpoint for the regulated +5 V DC (±5%) power supply. DCOM provides a 0 V common reference point for test signals. P15 provides a testpoint for the regulated +15 V DC (±5%) power supply. N15 provides a testpoint for the regulated −15 V DC (±5%) power supply. ACCT provides a testpoint for the ACCT signal from the DCFB to the SDCC. These testpoints enable maintenance personnel to verify power supply regulation and signal integrity without disconnecting any wiring.
Three protective fuses are included on the DS200DCFBG1BEB. FU1 (1/2 A, 2AG fast-acting) protects the 115 V AC power supplied for customer use; if this fuse blows, check for wiring errors or overload. FU2 (7 A, 2AG fast-acting) protects the signal-level power supplies +24, +15, and +5 V DC. When FU2 is blown, the drive is unable to generate fault messages, but LED CR51 will be lit when control power is applied. The usual cause of this fuse blowing is an accidental short of +24 V DC, either while probing or due to a wiring error at the terminal board. FU3 (7 A, 2AG fast-acting) protects the signal-level power supplies −24 and −15 V DC. When FU3 is blown, the programmer is unable to display fault messages, but LED CR55 will be lit.
These three fuses are the only end-user replaceable components on the DS200DCFBG1BEB board. If any other components on the board fail, the board must be replaced as a unit. If FU2 or FU3 continues to blow when connectors 1PL, 2PL, and 5PL are disconnected from the board, the DS200DCFBG1BEB should be replaced.
Board Connectors and Interfaces
The DS200DCFBG1BEB Power Supply Board receives input signals and power and sends output signals and power via eighteen plug connectors and nine stab connectors. These connectors provide comprehensive interfacing with the drive control cards, power connect card, SCR high voltage interface board, terminal boards, contactors, shunts, and AC line voltage and current inputs.
Connector 1PL provides the primary interface between the DS200DCFBG1BEB and the SDCC/LDCC board, carrying 40 signals including VCO outputs, voltage feedbacks, synchronization signals, SCR firing commands, contactor drives, and diagnostic signals. Connector 2PL distributes the regulated ±15 V, +5 V, and ±24 V DC power to the NTB/3TB or STBA, SDCC/LDCC, and SLCC boards, along with the /PSEN power supply enable signal.
Connector 4PL provides the 115 V AC output (both fused and unfused sides) and the Form C contacts from the MA pilot relay. Connector 5PL drives the gate pulse transformers on the PCCA Power Connect Card for the armature SCR bridge cells. Connector 1CPL accepts the ACCT current inputs from lines L1 and L3. Connectors CNPL, CPTPL, FAPL, NPL, and PPL provide control and power outputs for the MA contactor, 115 V AC outputs, controller cooling fan power, and SCR cathode/gate connections for the N2 and P1 SCRs.
Connectors SQPL, IA1PL, IA2PL, IF1PL, and IF2PL interface with the SHVI/SHVM board and the armature and field current shunts. SQPL provides 25 kHz power to the SHVI/SHVM board for the isolated measurement circuits. IA1PL and IA2PL accept the motor armature current shunt inputs (main generator field shunt and attenuator field shunt respectively). IF1PL and IF2PL accept the motor field current shunt inputs (main field and flashing field respectively). Connector MACPL provides the 24 V DC control outputs for the MD #1 and MD #2 contactors.
Nine stab connectors provide direct connections for the AC line voltages (V1, V2, V3), the DC bridge voltages (P1A, P2A), and the motor armature voltages (VM1A, VM1B, VM2A, VM2B). These stab connections are designed for high-current, low-impedance signal transmission, ensuring accurate voltage feedback even in high-power drive applications.
Diagnostics and Fault Detection
The DS200DCFBG1BEB Power Supply Board supports comprehensive diagnostic capabilities through its onboard indicators and the drive control system's software monitoring. The blown-fuse indicators (CR51, CR55, LT1) provide immediate visual notification of power supply faults. The /PSEN signal generates a microprocessor reset on the SDCC/LDCC board if the +5 V DC supply goes out of regulation, preventing the drive from operating with invalid power.
The drive control system continuously monitors the power supply outputs and the feedback signals from the DS200DCFBG1BEB. Loss of armature current feedback, motor voltage feedback, or AC line voltage feedback will generate appropriate fault messages and protective actions. The ACCT signals are monitored for commutation failure and instantaneous overcurrent conditions, enabling rapid fault detection and trip initiation.
The board identification is stamped on the edge of the printed wiring board as part number DS200DCFBG#ruu, where the digits and letters convey specific information about the board's configuration and revision level. All digits are important when ordering or replacing any board. GE Industrial Control Systems ensures compatibility of replacement boards, even though boards of different revision levels may not contain identical hardware.
Installation and Replacement Procedure
Replacing the DS200DCFBG1BEB Power Supply Board requires careful adherence to safety procedures due to the potentially lethal voltages present on the board when powered. Only adequately trained persons who are thoroughly familiar with the equipment and the instructions should install or maintain this equipment.
Before beginning any replacement procedure, turn off all power to the drive and wait several minutes for all power supply capacitors to discharge. Test any electrical circuits before touching them to ensure the power is off. Never remove boards or connections, or re-insert them, while power is applied to the drive. Treat all boards as static-sensitive, use a grounding strap when handling boards, and always store boards in anti-static bags or boxes.
The replacement procedure begins by opening the equipment's cabinet door to access the printed wiring boards. The drive control card faces the front in the front board carrier. Pull the lock tabs located on either side of the board rack, then lift the front board carrier and tilt it forward and down to access the DS200DCFBG1BEB board.
Carefully disconnect all cables from the DS200DCFBG1BEB board. For ribbon cables, grasp each side of the cable connector that mates with the board connector and gently pull the cable connector free. For a cable with a pull-tab, carefully pull the tab. Push back on the plastic snaps (holders) to release the board from the board carrier.
Before installing the replacement board, verify that all jumpers and switches on the new DS200DCFBG1BEB board are set in the same position as they were on the old board. If a board revision has added or eliminated a configurable component, or if re-adjustment is needed, refer to the jumper and switch tables in the technical documentation. Because of upgrades, boards of different revision levels may not contain identical hardware; however, GE Industrial Control Systems ensures compatibility of its replacement boards.
Orient the new DS200DCFBG1BEB board in the same position as the one removed and install it onto the board carrier. Make sure all plastic snaps snap back into position to secure the board. Reconnect all cables to the board as labeled and ensure that the cables are properly seated at both ends.
After installing a new DS200DCFBG1BEB board, the EE parameter for voltage feedback offset, EE.574 (VFB0FS), must be adjusted. The procedure for performing this adjustment varies with the application of the board and the tools available (programmer board, ST2000, GE Control System Toolbox, or LynxOS Configurator). Refer to the applicable drive instruction book for performing the EE parameter adjustment procedure.
Finally, swing the front board carrier back up into position, slide the lock tabs on the side of the board rack back into the locking position, and close the drive cabinet door.
Application Suitability and System Integration
The DS200DCFBG1BEB Power Supply Board is a central component in GE's industrial drive and excitation control systems. Its comprehensive power supply, signal conditioning, and interface functions make it indispensable for the operation of DC2000, CB2000, EX2000, FC2000, GF2000, ME2000, and AC2000 IGBT drives.
In DC2000 and CB2000 drive applications, the DS200DCFBG1BEB provides the control power, motor field power, armature current and voltage feedback, AC line monitoring, and SCR gating signals required for precise DC
