ABB SNAT Series Modules

Technical Dossier

Product Details And Specifications

ABB SNAT Series: Comprehensive Module Range and Technical Overview

The ABB SNAT series represents the core control and I/O board architecture deployed across ABB's ACS600 and ACS800 medium-voltage and low-voltage AC drive platforms. These modules are installed across the full spectrum of global heavy industry — petrochemical refineries, nuclear power auxiliary systems, offshore oil & gas platforms, pulp and paper mills, and steel rolling lines. The SNAT architecture underpins drive control in applications where unplanned downtime carries six-figure hourly costs. Installed base estimates place ACS600/ACS800 drives in service at tens of thousands of sites across Europe, Asia-Pacific, and the Americas, making SNAT board availability a persistent procurement challenge for maintenance engineers worldwide.

The Evolution of SNAT Architecture

The SNAT board family was introduced alongside the ACS600 drive platform in the mid-1990s as ABB transitioned from analog-dominant drive control to fully digital ASIC-based architectures. First-generation SNAT boards used parallel backplane communication with proprietary DDCS (Distributed Drive Control System) fiber-optic links for master-follower and fieldbus integration. The ACS800 generation (introduced circa 2000) retained SNAT board form factors and connector pinouts in many positions, enabling partial cross-compatibility — a deliberate design decision that extended the serviceable life of the SNAT ecosystem well into the 2010s.

By the mid-2010s, ABB began transitioning new installations to the ACS880 platform with its ZCON/AINT/AINT-02 board architecture. The SNAT series entered a formal end-of-active-production phase, though ABB continued to supply service boards through authorized channels. As of 2026, the majority of SNAT part numbers are classified as obsolete or limited-availability, creating a sustained secondary market demand. Compatibility between SNAT generations requires careful firmware version matching — substituting a board without verifying the drive's software version can result in parameter incompatibility or fault codes (e.g., FF52, FF61).

SNAT Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced SNAT series modules. Each entry reflects the module's primary functional role within the ACS600/ACS800 drive system.

SNAT620PCB/61033513: ACS600 main control board; handles speed reference processing, I/O interfacing, and DDCS communication backbone.
SNAT601PCB: ACS600 pulse encoder interface board; provides HTL/TTL encoder feedback input for closed-loop vector control.
SNAT602PCB: ACS600 analog I/O expansion board; adds 4 analog inputs and 2 analog outputs for process variable integration.
SNAT603PCB: ACS600 digital I/O expansion board; 8 DI / 6 DO for external interlock and relay logic.
SNAT604PCB: ACS600 DDCS fiber-optic communication board; master link for multi-drive configurations.
SNAT605PCB: ACS600 fieldbus adapter interface board; supports PROFIBUS-DP and Modbus RTU protocol bridging.
SNAT610PCB: ACS600 gate driver interface board; transmits PWM signals to IGBT power module gate units.
SNAT615PCB: ACS600 measurement board; DC bus voltage and phase current sensing for protection logic.
SNAT621PCB: ACS800 main control board (RMIO equivalent predecessor); core processing for scalar and DTC control modes.
SNAT625PCB: ACS800 I/O extension board; expands standard terminal block capacity for complex automation wiring.
SNAT630PCB: ACS800 brake chopper control board; manages dynamic braking resistor switching logic.
SNAT635PCB: ACS800 power supply board; generates internal 24 VDC and ±15 VDC rails for control electronics.
SNAT640PCB: ACS800 SafeStop interface board; implements STO (Safe Torque Off) per IEC 61508 SIL 2.
SNAT645PCB: ACS800 synchronization board; used in multi-drive common DC bus configurations for phase alignment.
SNAT650PCB: ACS800 panel interface board; connects CDP312R and ACS-CP-C control panels to drive control logic.
SNAT660PCB: ACS800 DDCS master board; manages fiber ring topology for up to 12 follower drives.

Sourcing Hard-to-Find & Obsolete SNAT Parts

DriveKNMS maintains a dedicated inventory program for end-of-life ABB SNAT series boards. As ABB has progressively discontinued active production of ACS600 and ACS800 control boards, procurement teams at refineries, utilities, and OEM service organizations face lead times of 16–52 weeks through standard distribution channels — when stock exists at all.

DriveKNMS sources SNAT boards through a combination of decommissioned drive buybacks, authorized surplus liquidation, and verified refurbishment pipelines. All boards are cataloged by part number, firmware revision where readable, and physical condition grade. For critical spares programs, DriveKNMS can provide consignment stock agreements and long-term storage under controlled humidity and ESD-safe conditions. Customers operating legacy ACS600 installations with no planned migration to ACS880 are advised to establish a minimum 2-year buffer stock for high-failure-rate boards such as the main control and gate driver modules.

Quality Control for the SNAT Range

SNAT series boards present specific test challenges due to their multi-layer PCB construction, ASIC-based logic that cannot be re-flashed in the field, and sensitivity to backplane connector wear. DriveKNMS applies the following test protocol to all SNAT boards prior to dispatch:

Visual inspection: 10x magnification examination of all solder joints, capacitor bodies, and connector pins. Boards with evidence of thermal stress, electrolytic capacitor bulge, or corrosion on DDCS fiber ports are rejected at intake.
Powered bench test: Each board is installed in a matched ACS600 or ACS800 test chassis and powered through a full initialization sequence. Fault memory is read and cleared; all I/O channels are exercised against known reference signals.
DDCS communication verification: Fiber-optic transmit/receive power levels are measured with an optical power meter. Boards with degraded DDCS link performance (<-20 dBm receive sensitivity) are flagged for fiber transceiver replacement.
Firmware version logging: Software version is recorded from the drive parameter set (parameter 33.01 or equivalent) and documented on the board's test certificate to ensure compatibility with the customer's drive revision.
ESD packaging: All boards are shipped in anti-static bags with desiccant, inside rigid foam-lined cartons rated for international air freight.