Basler UFOV Under Frequency / Over Voltage Protective Module

The Basler UFOV is a solid‑state protective module that combines underfrequency and overvoltage protection in a single unit, identified by part number 9040000100. It is designed to protect generators, transformers, and distribution systems from abnormal frequency and voltage conditions. The module offers independent adjustable setpoints and time delays for each function, providing flexible and reliable protection.

Key Features

The module features independent underfrequency and overvoltage detection with separate pickup and time delay adjustments. It includes high‑accuracy sensing circuits with minimal drift. The unit provides both normally open and normally closed output contacts. 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: 45‑60 Hz (adjustable). Overvoltage trip: 110‑140% of nominal (adjustable). Time delay: 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 input voltage and frequency. The underfrequency element measures zero‑crossing intervals; when frequency falls below the setpoint, the timer starts. The overvoltage element compares RMS voltage against the setpoint; when exceeded, its timer initiates. If the condition persists for the set delay, the output relay is energized.

Applications

This module is used in generator sets, utility substations, and industrial power systems for load shedding and system protection. The combined functionality saves panel space and simplifies wiring.

Installation and Configuration

Mount the module on a panel. Connect voltage inputs and output circuits. Adjust setpoints and time delays using front‑panel potentiometers. Calibration with a precision source is recommended.

Maintenance and Reliability

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

Conclusion

The Basler UFOV protective module 9040000100 provides integrated underfrequency and overvoltage protection, ensuring reliable safeguarding of critical power equipment.