ABB SNAT604 5761861-2B SNAT604IFS Drive Control Relay Board

SNAT604 5761861-2B (SNAT604IFS) is a dedicated relay control board developed by ABB for ACS series variable frequency drives and industrial process control racks. Equipped with multiple built-in isolation relays and blue terminal connectors, it undertakes drive interlock signal switching, safety circuit control and HART analog signal transmission tasks, coordinating logic signals between main drive control unit and field peripheral devices.

This compact vertical PCB board adopts industrial-grade conformal coating to resist dust, temperature fluctuation and electromagnetic interference inside drive cabinets. It integrates LED diagnostic indicators for channel communication status, supports standard plug-in installation without complex wiring modification, and realizes redundant safety signal output to guarantee stable continuous operation of fan, pump and compressor drive systems in power plants and petrochemical sites.

Main Specifications

• Brand: ABB; Model: SNAT604, Part Code: 5761861-2B, Alias: SNAT604IFS; Series: ACS Drive Auxiliary Control Board
• Onboard Hardware: 3 sets of high-isolation signal relays, multi-channel HART analog signal circuits, status LED indicators
• Signal Interface: Blue multi-pin terminal connectors for drive backplane connection, analog 4-20mA HART communication channels
• Operating Power: 24VDC industrial auxiliary power supply, typical power consumption below 15W
• Physical Parameter: Vertical PCB layout, overall weight approx 0.75kg, cabinet IP20 protection rating
• Operating Environment: -20℃ ~ +60℃ continuous working temperature, 5%–95% RH non-condensing, anti-vibration industrial standard
• Diagnostic Indicator Rule: Steady LED = normal analog channel; 100ms flash = valid HART data exchange; 400ms off-flash = communication response loss
• Protection Design: Built-in surge suppression and channel galvanic isolation to eliminate cross-circuit signal interference
• Installation Mode: Direct plug-in matching ACS drive main control rack, no extra DIN rail bracket required
• Certifications: CE, UL industrial certification, compliant with power drive and process automation safety standards

Core Functions

• Convey interlock, fault reset and safety trip logic signals between the drive mainboard and external field sensors, contactors and protection switches.
• Process HART 4-20mA analog signals from flow, pressure and temperature transmitters, realizing two-way data communication with upper monitoring system.
• Onboard isolation relays switch high/low power control circuits separately to avoid signal distortion caused by strong electromagnetic interference of frequency converters.
• LED status lamps provide real-time visual diagnosis of analog channel health and HART communication connection for quick on-site troubleshooting.
• Redundant multi-channel signal output design ensures uninterrupted safety interlock execution even if single relay channel fails temporarily.
• Plug-and-play modular structure allows single board replacement without full drive shutdown to shorten equipment maintenance downtime.

Application Scenarios

• Auxiliary control spare replacement for ABB ACS series variable frequency drive cabinets in thermal power plants and combined cycle power stations.
• Drive interlock signal board for petrochemical compressor, water supply pump and flue gas fan frequency conversion control systems.
• Maintenance backup inventory for industrial waste heat recovery units, metallurgical circulating water and offshore platform auxiliary drive control cabinets.
• Matching relay control board paired with ABB ACS drive main control units, HART field transmitters and safety interlock switches.
• Retrofit replacement for aging drive control systems suffering analog signal loss, relay contact failure and HART communication interruption.

• Global aftermarket spare supply for automation maintenance teams managing ABB variable frequency drive and process control equipment worldwide.