Description
The Eaton Cutler-Hammer 99-5835-12 is a replacement main microprocessor assembly and logic controller board engineered specifically for the LMR Plus series of electric and diesel fire pump controllers. Manufactured for platforms deployed from August 2010 to the present, this digital logic board serves as the core processing engine of the fire pump control enclosure. It runs system logic, monitors critical pressure variables, logs historical event data, and interfaces directly with the peripheral door-mounted main display membrane and underlying power input/output boards.
Commercial Availability & Procurement Terms
- Condition: New Original (Factory Sealed Service Stock)
- Warranty: 12-Month Functional Warranty
- Availability: In Stock
- Standard Lead Time: Ships within 1–2 business days via global couriers (DHL, FedEx, UPS)
- Pricing Policy: Indicative pricing only. Final cost fluctuates based on critical emergency lead-time criteria and factory sourcing allocations. Contact our sales department for a formal, time-bound quote.
Technical Specifications
| Parameter | Specification / Value |
| Model / Part Number | 99-5835-12 |
| Product Series | LMR Plus Fire Pump Control Platform |
| Original Brand | Eaton / Cutler-Hammer |
| Component Type | Microprocessor Assembly / Logic Controller Board |
| System Compatibility | Electric and Diesel LMR Plus Controllers (August 2010 to Present) |
| Supported Interfaces | Connects to 99-5835-01 (I/O Board) and 99-5816-01 (Display Panel) |
| Data Retentivity | Integrated non-volatile memory for system parameter logging |
| Regulatory Standards | Designed to comply with NFPA 20 installation parameters |
| Enclosure Integration | Internal sub-plate mounting via non-conductive standoffs |
| Relative Humidity | 5% to 95%, non-condensing |
Deployment Constraints & Engineering Notes
1. Interconnecting Cable Dependencies
The 99-5835-12 part designation covers only the populated logic circuit board assembly.
Field Warning: This spare part does not include the essential internal data and power cables. If your original system experienced a localized electrical short, trace heating, or physical wire fatigue, you must source the data ribbon cable (part number 4A55723H01) and the dedicated logic-to-I/O power cable (part number 4A55723H02) separately to complete the panel rebuild.
2. Mandatory Parameter Re-Configuration
The 99-5835-12 acts as a blank logic engine replacement when pulled from factory service stock. It does not contain pre-configured, site-specific system values.
- Post-Installation Calibration: Upon powering up the new board, you must access the LMR Plus configuration menus via the display panel to manually program the specific motor horsepower, nominal line voltage, phase rotation parameters, and pressure transducer start/stop thresholds.
- NFPA 20 Compliance: Ensure all setpoints exactly match the engineering specifications stamped on the fire pump room equipment data plates to maintain local NFPA 20 system certification.
3. Isolation and Anti-Static Measures
This logic board utilizes sensitive complementary metal-oxide-semiconductor (CMOS) components that are highly vulnerable to electrostatic discharge (ESD).
- Isolate the main three-phase incoming power circuit breaker and all auxiliary control voltages (including jockey pump utility feeds or remote start lines) before opening the enclosure.
- Wear a properly grounded ESD wrist strap when unboxing and handling the replacement board. Secure all corner mounting standoffs evenly to prevent mechanical twisting strain across the multi-layer printed circuit board (PCB) traces.
Frequently Asked Questions
Can the 99-5835-12 board be used in legacy legacy pre-2010 Eaton fire pump panels?
No. This board is engineered explicitly for the modernized LMR Plus architecture introduced in August 2010. Legacy configurations utilizing older digital microprocessors feature completely different mounting holes, power inputs, and communications protocols. Attempting to retrofit this board into older enclosures will result in a physical alignment conflict and pin mismatch.
What causes a “Communication Failure” error code immediately after swapping this board?
This typically points to an unseated data ribbon cable between the 99-5835-12 logic board and the 99-5835-01 input/output board, or a firmware mismatch with an older door display assembly (such as the 99-5816-01). Isolate the power, inspect the pin alignment on both ends of the ribbon cable, ensure the connection tabs latch securely, and verify the model revision numbers.
Does this board monitor diesel engine parameters as well as electric motor lines?
Yes, the underlying logic processing core supports both electric and diesel firmware paths. However, peripheral mapping relies on the specific I/O board configurations it couples with inside the panel box. Ensure you specify your prime mover configuration (electric motor or diesel engine) during commissioning to verify parameter arrays match field device inputs.
| Eaton MTL838C – Surge Protection Device / Signal Isolator |
| EATON 8922-RB-IS MTL8000 Intrinsically Safe Relay Output Module |
| EATON PL9-C16-2-DC|Miniature Circuit Breaker |
