Brief Product Description

UNITROL1010‑0002, part number 3BHE035301R0002, is a compact microprocessor‑based digital automatic voltage regulator belonging to ABB UNITROL 1000 series. Designed for brushless synchronous generators and synchronous motors, this excitation controller delivers precise field current regulation to maintain stable generator terminal voltage under variable load conditions. Equipped with IGBT power stage, multiple configurable digital and analog I/O, Ethernet and USB communication interfaces, it supports commissioning via ABB CMT1000 engineering software. Built‑in protection functions ensure safe operation for land‑based, marine and industrial power‑generation assets. As a widely‑deployed spare component, it is available as fully‑tested surplus and refurbished units for maintenance and retrofit of existing excitation control installations.

Core Product Functions

• High‑precision automatic voltage regulation (AVR) for synchronous generators and synchronous motors
• Multiple control modes: voltage regulation, power‑factor control, VAR/reactive power control and droop characteristic adjustment
• IGBT‑based excitation power stage for brushless exciter field current control
• Comprehensive generator‑oriented protection: over‑excitation, under‑excitation, field over‑current and loss‑of‑sensing monitoring
• Configurable digital inputs and relay outputs for interlock logic, alarm and trip signal handling
• Ethernet Modbus TCP and USB service interfaces for remote monitoring, parameter setup and fault diagnosis
• Support CMT1000 PC software for on‑site commissioning, parameter backup, trending and event log review
• Built‑in event recording and fault timestamping for post‑disturbance root‑cause analysis
• Compliant with mainstream grid‑code requirements for grid‑connected generator units

Application Scenarios

• Excitation control for medium‑small synchronous generators driven by diesel, gas turbine, steam turbine and hydro‑turbine
• Captive power plant, combined‑heat‑and‑power station and distributed generation unit AVR control cabinets
• Marine vessel auxiliary generator sets and offshore platform power‑generation excitation systems
• Oil & gas, mining and heavy‑industry on‑site self‑power‑generation control panels
• Retrofit and upgrade projects for legacy generator excitation control systems
• Spare replacement excitation controller for maintenance, troubleshooting and upgrade of existing UNITROL 1000 series installations

FAQ (Frequently Asked Questions)

• Q: Generator voltage becomes unstable after installing UNITROL1010‑0002 (3BHE035301R0002)?
  A: Check PT voltage sensing wiring, verify AVR parameter tuning, confirm exciter circuit integrity and inspect auxiliary power supply stability.
• Q: Cannot connect to the controller with CMT1000 commissioning software?
  A: Verify USB / Ethernet physical connection, IP address configuration, firewall settings and confirm correct software version matching for hardware variant.
• Q: Can this unit be used for static excitation systems with slip‑ring generators?
  A: This variant is optimized for brushless exciter applications; please verify hardware rating and control logic before applying to slip‑ring static excitation configurations.
• Q: Does UNITROL1010‑0002 support hot‑swap replacement during generator running?
  A: It is not designed for hot‑swap under excitation live conditions; isolate power and field circuits before hardware replacement per official service manual.

3BHE035301R0002.pdf