Description
The GE General Electric DS3800NOCA1B1B is an Overcurrent Overload Board for the GE Mark IV Speedtronic turbine control system. The NOCA board is designed for overcurrent and overload monitoring within GE gas and steam turbine control applications. The DS3800NOCA1B1B includes board-level logic and analog circuitry, test points, status LEDs, a toggle switch, and board-to-board connection capability for the optional DS3800DOCA auxiliary board. Its hardware includes a 28-pin female connector and a right-angle PCB mating connector. The board is a legacy Mark IV component intended for compatible system maintenance, replacement, and spare-parts requirements.
📋 Product Datasheet
| Specification | Details |
|---|---|
| Brand | General Electric (GE) |
| Model | DS3800NOCA1B1B |
| Functional Model | DS3800NOCA |
| Series | Mark IV Speedtronic / DS3800 |
| Product Name | Overcurrent Overload Board |
| Functional Acronym | NOCA |
| Board Type | Protection / Monitoring PCB |
| Primary Application | Gas and Steam Turbine Control |
| Main Function | Overcurrent and Overload Monitoring |
| Board-to-Board Interface | Supports optional DS3800DOCA auxiliary board |
| Connectors | 28-pin female connector + right-angle PCB mating connector |
| Test Points | TP0 through TP4 |
| Status Indicators | 6 LEDs reported on the specific 1B1B assembly |
| Switches | 1 toggle switch |
| Potentiometers | Additional adjustment capability available with optional DS3800DOCA |
| Mounting Features | Factory-drilled board with alignment markings and extractor clips |
| Product Status | Legacy / Obsolete-Generation Spare |
| Condition | Verify actual item condition before installation |
| Dimensions | Verify from physical unit |
| Weight | Verify from physical unit |
| Country of Origin | Verify from product label |
⚙️ Main Functions
• Monitors overcurrent and overload conditions within compatible Mark IV turbine control circuitry.
• Provides protection-related signal processing for GE Speedtronic turbine control applications.
• Uses onboard logic and analog circuitry for control and monitoring functions.
• Provides TP0–TP4 test points for maintenance and diagnostic work.
• Provides LED indicators for board status and operating conditions.
• Supports the optional DS3800DOCA auxiliary board through dedicated board-to-board connections.
• Uses factory alignment markings and extractor clips for installation and service access.
❓ Q&A
Q: What is the exact part number?
A: The exact board number is DS3800NOCA1B1B, with DS3800NOCA as the functional model designation.
Q: What is the product name?
A: It is a GE Mark IV Overcurrent Overload Board.
Q: What system does it belong to?
A: It belongs to the GE Mark IV Speedtronic turbine control system family.
Q: What is the primary function?
A: The NOCA board provides overcurrent and overload monitoring/protection functions.
Q: Does it support an auxiliary board?
A: Yes. The DS3800NOCA assembly can accept the optional DS3800DOCA auxiliary board.
Q: How many test points are available?
A: The DS3800NOCA1B1B documentation identifies five test points, TP0 through TP4.
Q: Is this compatible with newer Mark VI systems?
A: It is a Mark IV component. Compatibility with Mark VI or other generations should not be assumed; verify the complete system configuration and replacement part number before installation.
Q: What should be checked before replacement?
A: Confirm the complete part number, board revision, connectors, auxiliary-board configuration, and existing Mark IV system documentation.
⭐ Recommended GE Mark IV / DS3800 Models
- GE DS3800DOCA — Auxiliary Board
- GE DS3800NOTA — Overtemperature Trip Card
- GE DS3800NOAB — Operational Amplifier Board
- GE DS3800NOAA — Operational Amplifier Board
- GE DS3800NISB — Signal Isolator Board
- GE DS3800NITA — Thermocouple Termination Board
- GE DS3800NLBA — Load Balance Card
- GE DS3800NLCA — Load Communication Inverter Board
- GE DS3800NLCB — LCI Analog Board
- GE DS3800NLIA — Load Inverter Board
- GE DS3800NMFA — Motor Field Regulator Board
- GE DS3800NMMC — Test Mode Card
- GE DS3800NPAD — Power Amplifier Card
- GE DS3800NPCA — Snubber Board
- GE DS3800NSCA — Speed Current Regulator Card
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