Description:
The ABB NAMC-03 (Stock / Order No. typically 63940135, sometimes referenced as part of the SDCS NAMC kit family) is a Non-Isolated Analog Measuring & Control Interface Board — often shipped as a kit including the PCB, mounting hardware, jumper links, and sometimes the ribbon cable to the SDCS-CON-2 / SDCS-CON-4 CPU — used in ABB ACS 600, ACS 800, and certain DCS 600 drive control units. It processes analog feedback signals (motor current, DC-link voltage, external analog references 0–10 V / 4–20 mA), provides speed/torque reference inputs, and in some configurations handles tacho/encoder-derived feedback scaling. The NAMC-03 works in tandem with the SDCS-CON-x CPU board to close the regulation loops that determine drive output frequency and voltage.h2 Application Scenarios:A paper-machine sectional drive using ABB ACS800 units began showing subtle speed-regulation drift on one rewinder section — the drive itself was healthy but the 0–10 V analog speed-reference from the master PLC read inconsistently at the drive’s AIN terminals. Loop-check revealed the NAMC-03’s on-board A/D reference trim had drifted beyond tolerance after 15 years of service. The maintenance team replaced the entire ABB NAMC-03 Control Board Kit, re-applied the factory-default jumper configuration, and re-calibrated the analog input span in the drive menu. Speed-reference tracking returned to ±0.01% of setpoint and the rewinder tension control stabilized — eliminating off-spec roll rejects. The NAMC-03 kit solved the pain point of degraded analog measurement accuracy that mimics a bad PLC signal or motor problem, and because the kit includes correct jumpers and hardware the swap was completed without scavenging parts from decommissioned units. This underscores why the NAMC-03 is a high-value critical spare for process lines where analog precision directly affects product quality.h2
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | NAMC-03 (Order / Stock No. 63940135 / 3BHT… series depending on kit revision) |
| Manufacturer | ABB (ABB Drives / Motion Control — SDCS Accessory Family) |
| Product Category | Non-Isolated Analog Measuring & Control Interface Board (sold as Kit w/ hw & cable) |
| Compatible Drives | ABB ACS 600, ACS 800 (cabinet & wall-mount with SDCS-CON-2 / CON-4), DCS 600 (DC Drive) |
| Analog Inputs | 2–3 channels typical — 0–10 V, ±10 V, 4–20 mA (jumper-selectable range & mode per channel) |
| Analog Functions | Speed ref, Torque Ref, External Feedback, DC-Link Mon, Motor Current Mon (scaled) |
| Connection to CPU | Ribbon cable / header to SDCS-CON-2 or SDCS-CON-4 control board |
| Calibration | On-board trimmers for zero & span (or via drive menu in later fw) |
| Mounting Method | Internal drive chassis — screws to standoffs; often piggy-backed or adjacent to SDCS-CON-x |
| Kit Contents | PCB, mounting screws/spacers, jumper links, ribbon cable (length per kit variant) |
| Operating Temp. | -20 °C to +65 °C (drive-cabinet ambient) |
| Protection Rating | IP00 (bare PCB — installed inside enclosed drive enclosure) |
| Associated Board | SDCS-CON-2 (3ADT220090R0022) / SDCS-CON-4 — usually replaced/maintained as a pair |
h2 Technical Principles and Innovative Values:
- Tightly Coupled Analog Front-End to Drive Regulation Loop: The NAMC-03 conditions external analog reference and feedback signals through precision op-amp buffers and A/D conversion staged close to the SDCS-CON-x CPU, minimizing noise pickup compared to routing low-level analog signals over long external wiring. This yields more stable speed/torque regulation — particularly important in paper, printing, and web-handling lines.
- Jumper-Selectable Input Ranges & Modes Reduce External Components: Instead of requiring external signal-conditioning transmitters to force 0–10 V into a 4–20 mA drive input, the ABB NAMC-03 lets the installer choose input mode (voltage/current, unipolar/bipolar) via on-board jumpers — simplifying panel design and reducing points of failure in the analog reference chain.
- Part of a Modular, Replaceable Control Section: Sold as a kit with the correct ribbon and hardware, the NAMC-03 can be swapped in minutes without hunting for compatible cables or guessing jumper positions. Because it stores no user parameters (those reside on the SDCS-CON-x CPU), replacement requires only a visual re-check of jumper settings against the drive documentation — no re-commissioning of the drive application logic.
