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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Specification |
| Manufacturer | Valmet Automation / Metso / Neles |
| Part Number / Designation | A413654 (NCU2 / Network Control Unit 2) |
| Module Class | Communication & Protocol Interface Controller Board |
| System Compatibility | Valmet DNA DCS, FIU1 Racks, ND9000 Intelligent Valve Controllers |
| Supported Protocols | HART, RS-485, Ethernet, Proprietary System Bus |
| Signal Protection | Optoelectronic Isolation on Signal Endpoints |
| Power Supply Requirements | 24 VDC Nominal Rack Power |
| Operating Temperature | 0 to +60 °C |
| Weight & Dimensions | Approx. 0.85 kg; 235 mm x 160 mm x 35 mm |
Product Introduction & Supply Chain Strategy
The Valmet/Metso A413654 (NCU2) is a Network Control Unit processor board designed for the Valmet DNA Distributed Control System (DCS). Operating inside central process racks and field communication nodes (such as FIU1 units), the A413654 executes complex interface management, converts field digital/analog protocols (HART, RS-485, 4–20 mA), and maintains telemetry between the main controller and intelligent field positioners like the Neles ND9000.
Maintaining an A413654 module in safety stock is a necessity for high-availability paper mills, chemical plants, and energy facilities. Because the NCU2 board coordinates network traffic for entire control branches, a controller board failure can disrupt communication across multiple loops simultaneously. Sourcing New Surplus units ensures original factory dielectric isolation, stable transceiver timing, and zero baseline drift compared to aged refurbished alternatives.
A413654
A413654
Installation & Configuration Guide
1.Stage 1: Pre-Installation (Safety & Prep):Notify operators, halt loop updates, and wear ESD wrist strap.
Notify system operators that network branch communications will temporarily go offline. Put connected control loops in Manual mode or lock them into safe fall-back states. Fully de-energize the target rack slot following Lock-Out/Tag-Out (LOTO) protocols. Attach a grounded ESD wrist strap before handling the circuit board.
2.Stage 2: Card Removal:Unfasten retaining screws and extract card from slot.
Unscrew the faceplate screws securing the card to the chassis. Carefully disengage the module from its backplane bus connector and slide it straight out along the guide rails. Store the removed unit immediately in an anti-static shielding bag.
3.Stage 3: Physical Installation:Set hardware jumpers and slide card smoothly into backplane.
Verify that any onboard configuration jumpers or node switches on the replacement A413654 match the original card. Align the card edges with the rack card guide tracks and slide it inward until the rear DIN edge connector seats firmly into the backplane. Secure the front panel mounting screws.
4.Stage 4: Power-On & Network Verification:Apply rack power, check communication LEDs, and test node polling.
Re-energize the rack and observe the status LEDs. Confirm that the Power LED turns solid green and Network/Bus Activity LEDs begin flashing without fault indicators. Access the Valmet DNA engineering workstation to verify that all slave devices and valve controllers on the node communicate properly.
Configuration & Operational Notes
- Network Address Synchronization: Ensure the node address assigned to the A413654 matches the hardware layout in the Valmet DNA software environment to avoid IP or fieldbus address conflicts.
- Electrostatic Sensitivity: The board uses high-density CMOS components. Always handle the card by its faceplate bracket and card edges, keeping hands clear of bare surface-mount components.
- Power De-energization: Always shut down slot power before card insertion or extraction to protect onboard optocouplers and communication transceivers from voltage spikes.
Frequently Asked Questions (FAQ)
Q: What is the main function of the Valmet NCU2 card?
A: The acts as a Network Control Unit (NCU2) processor board. It manages high-speed data transmission, executes interface control logic, and bridges protocols (HART, RS-485, Ethernet) between the DCS and field equipment.
Q: Is the compatible with Neles valve controllers?
A: Yes, it is specifically engineered to interface Valmet DNA DCS systems with field equipment, including Neles ND9000 intelligent valve controllers.
Q: Why choose New Surplus over a refurbished NCU2 module?
A: Communication interface boards process continuous high-frequency digital signals. Refurbished modules with aged capacitors or worn optocouplers can cause intermittent packet drops or bus lockups. New Surplus guarantees factory signal integrity and long-term operating stability.
Q: What warranty coverage comes with this module?
A: Every New Surplus Valmet Metso board ships in ESD shielding packaging with verifiable serial numbers and is backed by a standard 1-year replacement warranty.
