DS3800HRRA - Digital I/O Relay Output Card

SPECIFICATIONS:

Part Number: DS3800HRRA
Manufacturer: General Electric
Product Type: Digital I/O Relay Output Card
Series: Mark IV
Number of Outputs: 8
Relay Contact Rating: 250 VAC, 5 A
Output Voltage Range: Up to 250 VAC
Status Indicators: 8 Red LEDs
Size: 8.25 cm high x 4.18 cm
Operating Temperature: 0°C to 70°C
Repair: 3-7 Days
Availability: In Stock
Weight: 2.5 Kg
Country of Origin: United States

FUNCTIONAL DESCRIPTIONS:

DS3800HRRA is a Digital I/O Relay Output Card manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic Gas Turbine Control Systems. It receives low-voltage digital signals from the system's processor and converts them into relay-actuated outputs capable of switching higher-voltage equipment. This functionality allows the control system to manage external components like solenoids, alarms, or contactors safely and effectively. The card ensures electrical isolation between the control logic and field wiring, protecting the system from voltage spikes, electrical noise, and ground loops that could otherwise cause malfunctions or damage.
Each output channel on the card is typically linked to an electromechanical relay, which actuates based on the input signals received. Red LEDs are provided for each channel to visually indicate the operational status of the relays, allowing for easy monitoring and quick diagnostics. Some models may also feature an amber LED to signal overall board status or power availability. By combining reliable switching, electrical isolation, and visual indicators, the Digital I/O Relay Output Card plays a crucial role in maintaining operational safety and system performance in industrial environments.

INSTALLATION:

The Digital I/O Relay Output Card must be installed with the system power off. Using ESD precautions, insert the card into the designated Mark IV backplane slot, ensuring the edge connector mates fully with the backplane connector. Secure the card using retention levers or screws to maintain mechanical stability. Verify that the card is properly seated to prevent intermittent connections. Connect the relay output wiring to the terminal blocks according to the system wiring diagram, ensuring correct polarity and output channel assignments. Confirm all connections are tight and conform to specified ratings. If applicable, set onboard configuration jumpers or toggle switches per system requirements. After installation, power the system and verify card operation via the status LEDs before proceeding with normal system operation.

OPERATION:

The Digital I/O Relay Output Card initializes its internal circuitry and enters a ready state. It continuously monitors digital output commands from the Mark IV control processor and energizes the corresponding relays by switching their coil circuits. Each relay output switches the connected external load according to the logic signals received, allowing controlled activation of field devices such as solenoids or contactors. The card provides real-time status via onboard LEDs, where each red LED indicates the energized state of its associated relay output channel. An amber LED, if present, signals overall card status or fault conditions. The relay outputs operate under continuous control from the system logic, and the manual reset toggle switch can be used to reset faults or relay states when required, but should only be operated by qualified personnel due to the presence of high voltage.

COMPATIBILITY:

The relay outputs on the DS3800HRRA are rated for industrial control voltages and currents as specified by GE standards (typically 24 VDC to 250 VAC, depending on relay configuration). Compatibility with field wiring and external devices must conform to these electrical ratings to prevent damage. Additionally, the card’s firmware and hardware revision must be matched with the overall Mark IV system configuration to ensure correct signal routing and reliable operation. Use of the DS3800HRRA outside of approved Mark IV platforms or non-DS3800 backplanes may result in malfunction or damage and is not supported.

WOC holds the largest inventory of replacement parts for GE Speedtronic Gas Turbine Control Systems, including both new and refurbished boards backed by warranty. We also offer expert repair services for damaged units. Our skilled team is available 24/7 to support all your OEM and automation requirements. For pricing and availability of parts or repair services, please reach out to us via phone or email.

FREQUENTLY ASKED QUESTIONS:

What is the primary function of a Digital I/O Relay Output Card?

The primary function of the Digital I/O Relay Output Card is to act as an interface between the control system’s low-voltage digital signals and external high-voltage devices. It receives logic-level outputs from the control processor and uses onboard relays to switch power to field devices like solenoids, contactors, or alarms, enabling safe and reliable control of these devices without exposing the control electronics to high voltage or current.

How many output channels does the card provide?

This card provides eight independent relay output channels. Each channel corresponds to a relay capable of switching external devices, allowing the control system to manage multiple outputs simultaneously with isolation between channels for safety and reliability.

Can the card handle both AC and DC loads on outputs?

Relay outputs are usually capable of switching both AC and DC loads within rated limits, but users must verify ratings and follow guidelines for specific load types.