ABB UNITROL 1020 3BHE030579R006 Product Description

The UNITROL 1020, part‑number 3BHE030579R006, is a compact integrated automatic‑voltage‑regulator (AVR) excitation controller of ABB UNITROL‑1000 series. This complete unit integrates control‑CPU, measurement‑circuit, PWM power‑output stage and local HMI panel, designed for brushless‑excited synchronous generators / motors up to approx 50 MVA, rated continuous excitation output 20 A DC, 40 A short‑time overload capability. It performs generator‑voltage regulation, reactive‑power / power‑factor control, multiple‑limiters, protection‑monitoring and fault‑recording. Commissioning and parameter download are completed by CMT1000 PC‑engineering software; 3BHE030579R006 is a specific order variant with fixed I/O and firmware baseline, widely deployed for land‑power‑plant, marine‑power‑system and industrial‑generator retrofit‑spare‑part projects.

Product Features

• All‑in‑one excitation AVR unit: control processor + power converter + measurement + local graphical HMI; rated 20 ADC continuous excitation output, 10‑second 40 ADC overload capacity.
• Multiple regulation modes: AVR‑voltage, FCR‑field‑current, PF‑power‑factor, VAR‑reactive‑power control; integrated V/Hz limiter, over‑excitation / under‑excitation limiters, rotor‑current limitation functions.
• On‑board measurement acquisition for generator voltage, excitation current, auxiliary‑supply signals; comprehensive fault‑diagnosis, event‑buffer and disturbance‑recorder for post‑trip analysis.
• Communication interfaces: Modbus‑TCP over Ethernet, RS485; supports remote parameter access and plant‑DCS system interconnection; freely configurable digital‑input / digital‑output / analog‑I/O channels.
• Wide‑range auxiliary power input, accepts AC / DC supply; robust aluminum base‑plate mechanical construction, high EMC immunity, suitable for cabinet‑mount installation under harsh industrial‑site conditions.
• 3BHE030579R006 hardware variant; I/O definition and firmware baseline must match original project specification; cannot directly swap‑in with UNITROL‑1010 without project‑adaptation.
• Pre‑loaded base firmware; generator‑specific excitation‑parameters, logic‑setting and communication‑configuration must be downloaded via CMT1000 commissioning‑tool before generator commissioning.

Application Scenarios

• Diesel / gas‑engine gen‑sets, small‑medium hydro‑power‑plant brushless‑excitation control cabinets.
• Marine‑vessel auxiliary‑generator and electrical‑propulsion synchronous‑machine excitation regulation systems.
• Industrial large‑synchronous‑motor drive‑systems for metallurgy, petrochemical and mining‑plants.
• Retrofit‑replacement and spare‑part‑maintenance for existing UNITROL‑1020 installations running on‑site generators.
• Mobile‑traction diesel‑electric‑locomotive on‑board generator excitation control applications.

Frequently Asked Questions