Product Overview

ABB UNITROL 1020 UNS0119A-Z,V1 3BHE030579R0001 is an automatic voltage regulator and excitation-control component for synchronous generator applications. It belongs to the ABB UNITROL 1000 family of compact digital excitation systems.

The UNITROL 1020 platform provides voltage regulation together with functions for reactive power, power factor, excitation-current control, monitoring, limiting, synchronization, and system communication. ABB’s product literature lists UNITROL 1020 with USB, RS485/CAN and Ethernet interfaces, as well as analog and digital I/O.

The specific eBay listing identifies the unit as UNS0119A-Z, Version 1, 3BHE030579R0001 and currently lists it as Seller Refurbished with the seller note “Good condition.”

Key Technical Specifications

ABB’s UNITROL 1020 family documentation specifies up to 20 A continuous excitation output at 55°C for the 1020 hardware platform, but this should not be interpreted as a standalone electrical rating for every specific configuration or for the UNS0119A-Z,V1 controller itself.

Main Functions

The UNITROL 1020 platform is designed to regulate generator voltage and manage excitation-related operating conditions.

Depending on the configured system, control functions can include:

• Automatic voltage regulation (AVR)
• Field/excitation current regulation
• Reactive power control
• Power factor control
• Automatic synchronization and voltage matching
• Excitation current limiting
• Rotating diode monitoring
• Generator and excitation-system monitoring
• Event recording and data logging
• Redundant-channel coordination

These functions make the UNITROL 1020 suitable for generator excitation systems where stable voltage regulation and controlled excitation are required.

Typical Applications

• Hydroelectric generator excitation
• Thermal power generation
• Diesel and gas generator sets
• Industrial synchronous generators
• Power plant excitation systems
• Generator retrofit and maintenance projects
• Replacement of existing UNITROL 1020 equipment

Installation & Commissioning

Installation should be performed by qualified electrical and commissioning personnel.

Before replacing the controller, record the existing hardware identification, configuration, firmware information, parameter settings, and wiring arrangement.

Recommended procedure:

1. Isolate the generator and excitation power according to the plant safety procedure.
2. Confirm the complete ABB part number and hardware revision.
3. Photograph and document existing wiring and connectors.
4. Install the replacement in the correct UNITROL 1020 position.
5. Restore connections and verify grounding.
6. Load or confirm the required configuration parameters.
7. Check voltage, current, alarm and limiter settings.
8. Perform controlled commissioning and functional testing.

For commissioning and maintenance, ABB documentation references the CMT 1000 commissioning and maintenance tool for parameter adjustment, monitoring, trending, and data/event-log access.

Maintenance

Keep the controller protected from dust, moisture, vibration, and electrostatic discharge during storage and handling.

For a replacement unit, it is good practice to compare:

• Product ID
• Hardware version
• Software/firmware version
• Configuration parameters
• I/O assignment
• Communication configuration

Do not assume that two UNITROL 1020 units with similar external labels are interchangeable without checking the complete configuration.

Condition

Seller Refurbished — Good Condition

The current eBay listing states that this particular unit is Seller Refurbished and describes its condition as “Good condition.”

Recommended eBay Title

ABB UNITROL 1020 UNS0119A-Z V1 3BHE030579R0001 AVR Automatic Voltage Regulator

Chinese Short Title

ABB UNITROL 1020 3BHE030579R0001 | 自动电压调节器