General Electric 4116J79-G02 Mark III Dual Set-Point Board

The General Electric 4116J79-G02, also cataloged as the 4116J79 Dual Set-Point Board, operates as a dedicated hardware component for closed-loop signal evaluation and alarm triggering within Mark III gas turbine control systems.

Hardware Specifications

Backplane Bus Architecture and I/O Scaling

• The General Electric 4116J79-G02 interfaces directly with the Mark III control bus, processing analog signal inputs to drive discrete contact outputs or solid-state switching channels based on predefined threshold values.
• The internal logic relies on deterministic hardware comparators to execute bang-bang control actions, minimizing switching delay across dynamic gas turbine operating regimes.
• Board-level relay stages support configuration options for electromechanical contact relays (rated up to 8 A at 250 VAC) or solid-state relay modules (120 mA at 125 VAC / 250 mA at 150 VDC) optimized for high-duty-cycle switching without contact wear.
• System scaling relies on standardized edge connectors, ensuring fixed impedance matching and low bus loading across the backplane backplane backplane distribution rail.

Frequently Asked Questions

Q: What does the G02 suffix indicate for the 4116J79 circuit assembly?

A: The G02 designator specifies the second hardware revision of the 4116J79 base board, incorporating updated circuit trace layouts or component ratings while maintaining backward functional compatibility with the G01 release.

Q: Can the output relays on the 4116J79-G02 be field-configured for solid-state operation?

A: Option selection depends on the specific plug-in relay sub-modules populated on the board, allowing choice between high-current mechanical contacts and low-current solid-state relays for high-frequency switching tasks.

Q: Is hot-swapping permitted for the 4116J79-G02 board during live turbine operation?

A: No, the Mark III chassis backplane must be completely de-energized prior to inserting or extracting the board to prevent transient current spikes and unexpected trip signals.

Field Installation Guidelines

1. Power down the Mark III rack enclosure and disconnect primary AC/DC power sources before opening card cage retainers.
2. Observe anti-static precautions by wearing a grounded wrist strap attached to the panel earth bus.
3. Align the 4116J79-G02 card edges with the card guide rails, pushing evenly until the rear edge connectors seat fully into the backplane sockets.
4. Tighten front panel mounting screws to secure mechanical grounding and lock the card against vibration.
5. Verify signal wiring terminations on external terminal blocks for proper polarity and contact voltage limits.