Basler XR2002F Voltage Regulator – Wide-Frequency Excitation Control

The Basler XR2002F is a solid-state automatic voltage regulator designed for generators operating on 110 VAC sensing input with an exceptionally wide frequency range of 48 to 480 Hz. This makes it ideal for applications involving variable-speed prime movers, high-frequency alternators, or aircraft ground power units where frequency can deviate significantly from the nominal 50/60 Hz.

Core Technology

The XR2002F employs a pulse-width modulated (PWM) excitation circuit that maintains stable generator terminal voltage regardless of load or speed variations. Its control algorithm includes frequency compensation that adjusts the voltage setpoint proportionally to frequency, preventing over-excitation at low speeds and under-excitation at high speeds.

Electrical Characteristics

• Sensing Input: 110 VAC ±10%, 48–480 Hz

• Power Supply: Derived from the sensing input (self-powered)

• Output Current: 5 A continuous, 10 A forcing for 5 seconds

• Voltage Regulation: ±0.5% from no-load to full-load

• Response Time: < 30 ms for 90% recovery

• Droop Adjustment: 0–10% for parallel operation

Adjustments and Tuning

Front-panel potentiometers allow adjustment of voltage setpoint, stability (gain), and droop. A unique frequency roll-off adjustment lets the user set the knee frequency where the output voltage begins to decrease with falling frequency, protecting motors and other loads from low-frequency operation.

Protection Features

Built-in protection includes over-excitation limiting, short-circuit current limiting, and thermal shutdown. An under-frequency protection circuit reduces excitation when the frequency drops below a preset threshold, which also aids in generator start-up.

Installation and Connections

The XR2002F is housed in a rugged aluminum enclosure suitable for panel mounting. Terminals are clearly labeled for sensing input, field output, and auxiliary contacts. The unit is designed to operate in ambient temperatures from -40°C to +70°C and is conformally coated for humidity resistance.

Application Scenarios

Common uses include variable-speed diesel generator sets, hydro turbines with fluctuating speed, and high-frequency alternators for aviation or military applications. It is also used in wind turbine generators where frequency varies with wind speed.

Maintenance and Diagnostics

With solid-state construction, the XR2002F requires minimal maintenance. An LED status indicator shows power-on and fault conditions. Diagnostic outputs are available for remote monitoring of excitation voltage and current.

Compliance

This regulator meets relevant standards for electromagnetic compatibility (IEC 61000) and is designed to withstand vibration and shock typical of mobile power systems.

Conclusion

The Basler XR2002F Voltage Regulator offers unparalleled frequency flexibility and robust excitation control, making it a versatile choice for specialized generator applications.