Description

ABB UNITROL 1020 3BHE030579R0003 | Digital Excitation Control Unit Supporting PSS & Parallel Operation

Product Core Brief

Model: UNITROL 1020 UNS0119A-Z,V1 | 3BHE030579R0003
Brand: ABB
Series: UNITROL 1000 Excitation Control Platform
Core Function: Digital automatic voltage regulator to control excitation current for synchronous generators
Type: Static Excitation Controller / Digital AVR
Key Specs: Max 20A DC excitation output, built-in PSS function, Ethernet & RS485 communication

Condition: New Surplus, not refurbished

⚠️ Original manufacturing discontinued, limited spare inventory

Product Introduction

Voltage drift and unstable reactive power output often trigger generator trip events during grid fluctuation. ABB UNITROL 1020 3BHE030579R0003 UNS0119A-Z,V1 is a compact digital excitation controller built for medium-sized synchronous generators and synchronous motors.

This unit adjusts rotor excitation current dynamically to stabilize generator terminal voltage. It supports multiple operation modes including voltage regulation, power factor control and reactive power regulation. Integrated limiters, fault monitoring and event logging simplify on-site troubleshooting. Thousands of these controllers operate on hydro, gas turbine, diesel generator and marine power units. The unit works with CMT1000 commissioning software for parameter setup and real-time data monitoring.

Key Technical Specifications

Parameter	Details
Full Part Number	UNITROL 1020 UNS0119A-Z,V1 / 3BHE030579R0003
Product Type	Digital Automatic Voltage Regulator (AVR) / Excitation Controller
Max Continuous Excitation Output	20 A DC
Voltage Regulation Accuracy	±0.5% nominal generator voltage
Operating Modes	Auto voltage control, manual field current control, Q/PF regulation
Built-in Functions	PSS, V/Hz limiter, voltage droop, rotating diode monitoring, fault recorder
Communication Interfaces	Ethernet, RS485 Modbus RTU
Auxiliary Power Input	9–250 V AC / 18–300 V DC
Operating Temperature	-25 °C ~ +65 °C
Commissioning Tool	CMT1000 PC configuration software
Typical Application	Hydro/gas/diesel synchronous generators, marine power plants, industrial prime power stations

ABB UNITROL 1020 3BHE030579R0003

Quality Inspection Process

Incoming Verification

Cross-check serial number, nameplate and full part code UNS0119A-Z,V1 / 3BHE030579R0003. Complete visual inspection for housing damage, terminal corrosion, circuit board scratches and signs of prior field repair.
Live Bench Test

Install controller on dedicated UNITROL test bench. Run power-on self-test, communication handshake with CMT1000 software, parameter read/write test and continuous 24-hour aging test. Test photos or video can be provided on request.
Electrical Performance Test

Check power circuit insulation resistance, auxiliary power adaptability and signal input stability. Verify basic control logic response under simulated load conditions.
Firmware Recording

Read and record onboard firmware version. Document hardware revision label information.
Final Packing

Passed controller is sealed with anti-static bag, wrapped with shock-absorbing foam and packed into reinforced export carton. QC Passed label with inspection date attached externally.

Field Installation Pitfall Guide

Version & Part Code Matching

UNS0119A-Z V1 cannot be freely replaced with other UNITROL 1020 revisions. Different hardware variants have firmware and hardware circuit differences. One site experienced communication failure after mismatched replacement and spent two days troubleshooting.
Backup All Parameters Before Replacement

Export full parameter set via CMT1000 before removing the old unit. Incorrect limiter and PSS settings may lead to generator overexcitation or unstable parallel operation.
Wiring Separation Rule

Separate power excitation cables from low-voltage signal wiring. Inductive noise will distort measurement signals and cause voltage oscillation.
ESD Protection Requirements

Always wear anti-static wrist strap before opening the unit housing. Static discharge can damage DSP and communication chips in dry environments.
Excitation Load Capacity Check

Confirm generator excitation current stays within 20A continuous rating. Long-term overload will shorten service life of internal power semiconductors.

Quick Conclusion

Main usage: Digital excitation control and voltage stabilization for synchronous generators and motors
Core advantage: Multiple adjustable control modes, built-in power system stabilizer, convenient PC commissioning
Suitable industries: Hydropower stations, gas turbine power plants, diesel gensets, marine power systems
Not recommended: Generator units requiring excitation current higher than 20A without auxiliary hardware
Inventory reminder: OEM original production stopped, available spare stock limited
ABB UNITROL 1020 3BHE030579R0003

FAQ

Can UNITROL 1020 3BHE030579R0003 work without CMT1000 software?

The unit can run with factory default settings, but all customized parameters require CMT1000 for configuration and monitoring.
Is this unit available for parallel generator operation?

Yes. It supports voltage droop compensation and reactive power sharing for multiple generators running in parallel.
Can you provide bench test reports before shipment?

Yes. Complete communication test records and inspection photos can be provided after QC testing.
What warranty term do you offer?

12-month standard warranty starting from delivery date.