Basler UFOV 260A Under Frequency / Over Voltage Protective Module

The Basler UFOV 260A is a solid‑state protective module that combines underfrequency and overvoltage protection functions in a single compact unit. This module, identified as UFOV260A, is designed to safeguard generators and power systems from damaging frequency decays and voltage rises. It provides independent adjustable setpoints and time delays for each protection element, making it a versatile choice for utility, industrial, and marine applications.

Key Features

The UFOV 260A features independent underfrequency and overvoltage detection circuits with separate pickup and time delay adjustments. It includes high‑accuracy sensing with minimal drift over temperature. The module provides both normally open and normally closed output contacts for tripping breakers or activating alarms. Front‑panel LEDs indicate power, frequency status, voltage status, and trip conditions.

Technical Specifications

Input voltage: 120 VAC or 240 VAC, 50/60 Hz. Frequency measuring range: 40‑65 Hz. Underfrequency trip setting: 45‑60 Hz (adjustable). Overvoltage trip setting: 110‑140% of nominal (adjustable). Time delay range: 0.1‑10 seconds. Trip accuracy: ±0.1 Hz for frequency, ±1% for voltage. Output contact rating: 5 A at 250 VAC resistive. Operating temperature: -20°C to +65°C.

Operating Principles

The module continuously monitors the input voltage and frequency. The underfrequency element measures the zero‑crossing intervals to determine frequency; when it falls below the setpoint, the timer starts. The overvoltage element compares the RMS voltage against the setpoint; if exceeded, its timer initiates. If the respective condition persists for the entire delay, the output relay is energized, providing a trip signal.

Applications

This protective module is used in generator sets to prevent operation at unsafe low frequencies or high voltages. It is also applied in utility substations for load shedding and system integrity protection. The combined function saves panel space and simplifies wiring.

Installation and Configuration

Mount the module on a panel using the provided brackets. Connect the voltage inputs and output circuits. Adjust the frequency and voltage setpoints along with their time delays using front‑panel potentiometers. A calibration check with a precision source is recommended.

Maintenance and Reliability

Solid‑state construction ensures high reliability. Periodic testing validates the trip accuracy. Routine inspection of connections is sufficient.

Conclusion

The Basler UFOV 260A provides integrated underfrequency and overvoltage protection in a compact module, ensuring reliable safeguarding of power systems.