DS3800EPSA - Motor Exciter Power Supply Board

SPECIFICATIONS

Part Number: DS3800EPSA
Manufacturer: General Electric
Series: Mark IV
Product Type: Motor Exciter Power Supply Board
Input Voltage: 115/230 VAC �10%, 50/60 Hz
Output Voltage: 125�300 VDC
Output Current: 0�10 A
Voltage Regulation: �1%
Operating Temperature: -30�C to 55�C
Board Size: 15.7 cm High x 18.5 cm
Isolation Voltage: 1500 VAC
Repair: 3-7 Days
Weight: 2.00 lbs
Country of Origin: USA
Availability: In Stock

FUNCTIONAL DESCRIPTION:

DS3800EPSA is a Motor Exciter Power Supply Board manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic turbine control systems. The Motor Exciter Power Supply Board regulates and supplies DC excitation to the rotor field of synchronous generators or motors. It converts incoming AC power into a controlled DC output using a combination of step-down transformers, rectifiers, and linear/regulator circuits. The board maintains precise voltage and current profiles under dynamic load conditions, ensuring generator stability and preventing field overcurrent. Feedback loops monitor field voltage and current, enabling real-time corrections and integration with the turbine control system. Protective circuits provide overvoltage, undervoltage, and short-circuit protection to safeguard both the exciter and the motor. The board is engineered to operate reliably under high ambient temperatures, industrial vibration, and electrical noise environments.

• Voltage Regulation: Maintains a precise DC output to the exciter field for stable generator/motor operation.
• Current Monitoring: Provides feedback to prevent overcurrent and protect motor windings.
• Protection Features: Overvoltage, undervoltage, and short-circuit protection built in.
• Integration: Interfaces with turbine control and monitoring systems for remote status and diagnostics.
• Environmental Reliability: Designed for industrial conditions with high temperature tolerance, vibration resistance, and long-term operational stability.

OPERATION:

The Motor Exciter Power Supply Board receives AC input from the turbine auxiliary power supply and converts it into a regulated DC output for the exciter field winding of the synchronous generator or motor. The board continuously monitors the exciter field voltage and current using feedback sensors, adjusting the regulator circuits to maintain precise excitation levels. During load transients, the board responds in real time to prevent overvoltage or overcurrent conditions, ensuring stable generator operation. Protective circuits immediately isolate the output in case of fault conditions such as short circuits, undervoltage, or overvoltage events. The board communicates status signals to the turbine control system, enabling remote monitoring, diagnostics, and synchronization with overall generator control functions.

World of Controls offers the largest stock of GE Speedtronic Gas Turbine control system replacement parts, including unused and rebuilt boards, all backed by a full warranty. We also provide expert repair services for faulty boards, restoring them to OEM standards to ensure reliable turbine operation. Our team of automation specialists is available 24/7 to support your OEM needs, provide technical guidance, and assist with any control system requirements. For pricing, availability, or technical assistance on parts and repairs, please contact us by phone or email.

REQUENTLY ASKED QUESTIONS:

What is the primary function of the Motor Exciter Power Supply Board?

To provide regulated DC excitation voltage to the rotor field of synchronous generators or motors, ensuring stable operation and preventing field overcurrent or under-voltage conditions.

How does the board maintain voltage and current stability?

Through real-time feedback loops monitoring field voltage and current, the regulator circuits adjust the output to maintain precise excitation under varying load conditions.

Why might the exciter field voltage fluctuate under load?

Possible causes include failing regulator circuits, degraded filter capacitors, unstable AC input, or feedback loop issues. Inspect AC supply, regulator performance, and capacitor health.

What is the impact of capacitor degradation on board operation?

Degraded capacitors can cause unstable DC output, slower transient response, voltage ripple, and possible overcurrent trips.