ABB UNS2881B-P.V1 High Precision Voltage Measurement Module

Product Introduction

ABB UNS2881B-P.V1 (Part No.: 3BHE009319R0001) is a high-performance Measuring Unit Board (MUB) developed by ABB for power electronics and industrial automation. Primarily applied to UNITROL 5000 excitation systems, ACS 6000 medium-voltage frequency converters and Relion® 615 series protection relays, it delivers millisecond-level high-precision analog sampling, grid synchronization and signal transmission, serving as a core front-end module for closed-loop control and safety monitoring in power systems.

Overview

Equipped with a 32-bit RISC processor and 16-bit high-speed ADC, this module adopts 4-layer high-temperature resistant PCB. Operating on 24VDC power supply, it completes synchronous scanning of voltage, current and temperature across 16 channels within 1 millisecond. Data can be transmitted to the main control CPU via optical fiber or RS-485 interface, providing SIL 2 compliant safety monitoring and high-accuracy closed-loop control for generator excitation, HVDC converter valves and energy storage PCS systems.

Key Features

1. Superior Measurement Accuracy Voltage measurement accuracy reaches ±0.1% FS. With 16-bit ADC resolution, it supports standard signals of 0–10V, 0–20mA and 4–20mA, and is compatible with Pt100 and thermocouple temperature sensors to meet requirements of precision power monitoring.
2. High-Speed Synchronous Sampling All 16 channels finish scanning in just 1ms with a sampling rate of 1kHz. Multi-channel synchronous acquisition captures real-time dynamic grid signals to ensure timely control response.
3. Excellent Anti-Interference Performance Dielectric withstand voltage between channels and the main circuit is up to 1500VDC. It effectively resists strong electromagnetic interference and surge voltage, ideal for electrically noisy industrial environments with motors and frequency converters.
4. Stable Operation Under Harsh Conditions Wide operating temperature range: -40°C ~ +85°C. Rated IP20 protection class. The high-temperature resistant 4-layer PCB ensures reliable performance in outdoor facilities and high-temperature workshops.
5. Flexible Communication Options Comes with RS-485 (Modbus RTU) and optical fiber interfaces, supporting exclusive ABB protocols. Profibus-DP and EtherCAT are optional for seamless connection with ABB main control units and third-party devices.
6. Low Power Consumption & Easy Installation Power supply: 24VDC (±10%), power consumption ≤ 3W. Designed for 35mm DIN rail mounting with compact dimensions, enabling quick installation and convenient maintenance.

Technical Specifications

表格

Item	Specification
Model	UNS2881B-P.V1 (3BHE009319R0001)
Core Hardware	32-bit RISC Processor, 16-bit ADC
Input Channels	16 channels (universal for voltage, current & temperature)
Measurement Accuracy	±0.1% Full Scale
Sampling Rate	1kHz (Multi-channel Synchronous)
Full Channel Scan Time	1ms
Dielectric Withstand Voltage	1500VDC (Channel to System)
Power Supply	24VDC (20–30V), Power Consumption ≤ 3W
Operating Temperature	-40°C ~ +85°C
Protection Class	IP20
Communication Interfaces	RS-485, Optical Fiber; Optional: Profibus-DP, EtherCAT
Mounting Type	35mm DIN Rail

Typical Applications

• Generator Excitation System: Matched with UNITROL 5000, precisely collects excitation voltage and current to realize stable closed-loop voltage control for generators.
• Medium-Voltage Variable Speed Drives: Performs grid synchronization and voltage sampling for ACS 6000 systems, guaranteeing stable speed regulation and good power quality.
• Power Protection Relays: Used with Relion® 615 series relays for high-precision voltage monitoring and protection tripping of generators, transformers, power lines and motors.
• New Energy & Energy Storage: Applied in energy storage PCS, photovoltaic and wind power grid-connected systems to support stable grid connection and safety monitoring.
• General Industrial Automation: Conducts precision monitoring of voltage, current and temperature in chemical, metallurgical and manufacturing industries for closed-loop control and data acquisition.

Product Advantages

• Genuine ABB Quality: Original ABB product with 12-month warranty. Passed strict temperature cycle and anti-interference tests for long-term stable operation in industrial scenarios.
• High System Compatibility: Fully compatible with ABB excitation, drive and protection systems. Plug-and-play design reduces integration and commissioning costs.
• High Safety Level: Compliant with SIL 2 safety standard and equipped with high isolation design to