Description

Technical Parameters

Product Introduction

DS200DCFBG1B Power Supply Board (DCFB) receives 38 and 115 V ac (24 V dc) input power from the control power transformer (CPT), and provides control-level power to the drive and 115 V ac power (NA) to the enclosure fans. The DS200DCFBG1BPC has a variety of diagnostic and protection functions, including LED status indicator lights, fuse protection, voltage test points, and configurable DIP switches and jumpers, which facilitate on-site maintenance and system debugging. This power feedback board is widely used in industrial drives and gas turbine control systems such as GE Mark V, AC2000, DC2000, CB2000, FC2000, ME2000, and EX2000.

Technical Specifications

Manufacture	General Electric(GE)
Model	DS200DCFBG1B
Part Number	DS200DCFBG1BPC
Description	POWER SUPPLY BOARD
Origin	USA
Dimension	32245cm
Weight	0.75kg

Product Details

In the entire Mark V control system architecture, the DS200DCFBG1BPC mainly performs the following tasks:
Provide control-level power supply
Provide power for the cabinet fans
Monitor the system voltage and current
Generate a simulated feedback signal
Communicate with the control panel via signals

The DS200DCFBG1B board includes the following circuits:

• Control-level power supplies (+5, ±15, and ±24 V dc)

• Motor field power circuits (except the SCR module)

• Driver circuits for the motor field SCR gate pulse generators

• Circuits to monitor numerous AC line and DC motor signals, including:

− Armature current(s) and voltage(s) (NA)

− Motor field currents (NA)

− AC line current

− AC line voltage magnitude and phase sequence

POWER SUPPLIES

The DS200DCFBG1BPC board receives 38 V ac (±10%) from the CPT (24 V dc). This voltage is full-wave rectified and filtered to produce the unregulated ±24 V dc outputs. The +24 V DC output is rated at 3 A, and the 24 V DC output is rated at 1 A.

Regulators on the DS200DCFB board derive ±15 V dc from the ±24 V dc supplies. The ±15 V dc outputs are each rated at 0.8 A, of which 0.25 A is available for external loading.

The DS200DCFBG1B board also generates a+5V DCc, 4 A output from the +24V DC supply. The /PSEN signal on 2PL goes to a TTL low state when the +5 V dc supply is in regulation, and the signal goes high if the +5 V dc supply goes out of regulation. When high, /PSEN generates a microprocessor reset on the Drive Control Card (SDCC/LDCC).

The DS200DCFBG1B board provides isolated +5 and ±15 V DC supplies to power the armature current feedback circuits.

The power supply outputs are protected against short circuits by fuses FU2 and FU3 (7 A, 2AG). Light-emitting diodes (LEDs) CR51 and CR55 provide blown fuse indication for these fuses. The 115 V AC output is protected by fuse FU1 (1/2 A, 2AG). Neon light LT1 provides blown fuse indication for FU1.

VOLTAGE AND CURRENT FEEDBACK VCO CIRCUITS

The DS200DCFBG1B board includes voltage-controlled oscillator (VCO) circuits that convert input voltages to frequency signals. Each VCO has a nominal output frequency of 250kHz. The output frequency varies from 0 to 500 kHz, depending on the input voltage. VCO outputs are sent to the SDCC/LDCC board through connector 1PL to provide feedback on the following:

• SCR bridge ac input voltage

• Output bridge voltage

• Motor voltage (NA)

• Millivolt signals from field shunts

• Millivolt signals from armature shunts

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 the circuit. A frequency-to-voltage reconstruction circuit provides a diagnostic signal for testpoint TP37 on the SDCC/LDCC board through 1PL-37. The diagnostic bridge voltage signal can be viewed using an ac-coupled oscilloscope. The second VCO provides feedback of the motor voltage to the SDCC/LDCC board through 1PL-39.DIP switch SW5 is used to scale the voltage applied to the circuit.

Application Scenarios

Gas Turbine Control Systems
The GE DS200DCFBG1BPC is mainly applied in the GE Speedtronic Mark V gas turbine control system. During the operation of the gas turbine, it provides a stable control-level power supply for the drive system and real-time feedbacks key operating parameters such as voltage and current.

Steam Turbine Automation (Steam Turbine Control System)
In the large-scale steam turbine control system, the DS200DCFBG1BPC is mainly used to provide a stable power supply for the drive system and monitor the operating status of the system.
Through its internal circuitry, this module is capable of monitoring:
Motor excitation current
Motor armature current
Line current
Motor voltage signal

Power Generation Automation System
In modern power plant automation systems, DS200DCFBG1BPC is one of the key power management modules.
Its main functions include:
Provide a stable power supply for the control system
Provide feedback on the operating status of the equipment
Support fault diagnosis and protection

FAQ

Q: Can the DS200DCFBG1BPC be configured with parameters?

A: OK. This module includes 12 jumpers and 7 DIP switches. It can be configured according to different driving systems or application requirements, thereby adjusting the operating parameters of the system.

Q: Where is the installation location of DS200DCFBG1BPC in the system?

A: This module is usually installed inside the GE Mark V control cabinet or the drive control cabinet, and communicates and receives signals with the control board (such as SDCC or LDCC control cards) through connectors.

Q: What are the common faults of DS200DCFBG1BPC?

A: During the long-term operation, the following problems may arise:
The power fuse has blown.
Control the abnormal power supply output.
LED indicator light alarm
Module communication failure
The voltage feedback signal is unstable.
These problems can usually be resolved by checking the power supply, cable connections, or by replacing the modules.

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GE DS200DCFBG1BPC POWER SUPPLY BOARD