The ABB UNITROL 1020, cataloged under manufacturing part number 3BHE030579R0207 (Model UNS0119A-Z,V1), operates as a high-performance Automatic Voltage Regulator (AVR) designed for synchronous generators. It combines digital control architecture, flexible I/O configurations, and IGBT-based microprocessor technology to deliver precise excitation current control and stable power generation.
Hardware Specifications
Parameter
Specification
Model
UNITROL 1020 UNS0119A-Z,V1
Part Number
3BHE030579R0207
Brand
ABB (UNITROL Series)
Product Type
PLC Module
Excitation Target
Small to medium synchronous generators (Brushless system)
Rated Output Current
Up to 10 A DC continuous
External Logic Power
+24 V DC (Maximum 0.5 A)
Digital I/O Configuration
8 Input Channels | 8 Output Channels
Analog Input Capacity
2 or 4 channels configured for load cells / sensing inputs
Analog Output Capacity
4 channels (Selectable voltage or current profiles)
Local Interface Links
Ethernet, USB ports
Integrated Safeguards
Overvoltage, undervoltage, overexcitation, loss of sensing
Marine & Safety Marks
DNV and UL certified
Operating Temperature
-10 to +55 deg C
Process Instrumentation and Surge Voltage Protection Limits
The UNITROL 1020 monitors generator stator voltage via its analog sensing inputs, modulating its internal IGBT power stage to adjust the brushless excitation field. To withstand the harsh electrical transients common in power generation environments, the module's electronic terminal interfaces are engineered with high surge voltage protection limits. These protection limits shield the internal microprocessor core from inductive kickbacks during sudden main breaker drops or load rejections.
