Product Overview

The ABB 3BHB002953R0117, commonly referred to as the SCA Board (Scaling and Conditioning Adapter Board), is a specialized signal processing component engineered for ABB’s industrial drive and distributed control systems. This compact board serves a dual critical function: it performs high-precision analog signal scaling and linearization for field transducers, and in certain configurations, it acts as a serial communication adapter bridging the control system with RS-232 or RS-485 devices. The ABB 3BHB002953R0117 is a core element within the SCA-2 product family, typically found in the control cabinets of ACS600 and ACS800 large drive systems, as well as in AC800M DCS expansion racks and specialized HVDC valve control applications.

The primary purpose of the ABB 3BHB002953R0117 is to ensure the fidelity of analog signals traveling between field devices—such as speed sensors, pressure transmitters, and current feedback loops—and the main controller. By providing precision scaling (typically ±0.1%), linearization, and filtering, the ABB 3BHB002953R0117 eliminates signal drift and noise that can destabilize PID loops in heavy industrial processes. Unlike standard I/O modules that mount on a DIN rail, this board is designed for installation within the drive unit’s dedicated slot or a specialized chassis, making it a “form-fit-function” replacement tied to specific cabinet generations. Its robust industrial-grade design, featuring built-in opto-isolation and EMC protection, ensures reliable performance in high-noise environments such as rectifier cabinets and variable frequency drive (VFD) installations.

 

Technical Specifications

Parameter Name	Value
Product Model	3BHB002953R0117
Manufacturer	ABB
Product Type	SCA Board / Scaling & Communication Adapter Board
Series	SCA-2 (Scaling/Communication Adapter)
Typical Supply Voltage	24 V DC (Backplane or Cabinet Powered)
Signal Processing Accuracy	Approx. ±0.1% (Scaling/Linearization Mode)
Communication Protocols (Variant)	RS-232, RS-485, Modbus RTU
Operating Temperature	-20°C to +60°C
Storage Temperature	-40°C to +85°C
Mounting Type	Dedicated Drive/DCS Rack Slot (Non-DIN Rail Standard)
Protection Rating	IP20 (Cabinet Installation Only)
Dimensions (Approx.)	230 mm x 110 mm x 34 mm or 120 x 80 x 20 mm
Weight (Approx.)	0.35 kg – 0.55 kg

 

Main Features and Advantages

High-Precision Signal Conditioning: The ABB 3BHB002953R0117 provides precise scaling (±0.1%) and linearization of analog inputs such as 0-20mA or 0-10V signals. This high fidelity ensures that the control system receives accurate process data, which is vital for stable speed or torque regulation in drives and precision control loops in DCS applications. Its on-board anti-aliasing and filtering capabilities clean up noisy signals in environments with heavy electrical interference.

Built-in Diagnostic and Protection: The ABB 3BHB002953R0117 features diagnostic LED indicators (Power, Fault, Communication) and robust opto-isolation. This isolation protects the sensitive logic side of the controller from voltage transients and ground loops common in power electronics, while the LEDs enable rapid troubleshooting without specialized tools.

Dual-Function Flexibility: Depending on the specific hardware revision, the ABB 3BHB002953R0117 functions either as a pure scaling board or as a communication adapter. It can process analog values for closed-loop control or provide an RS-485 serial bridge for connecting external devices to the drive/controller, offering a versatile solution for integrating legacy components into modern systems.