Basler Electric SR4A1B05A3E Static Voltage Regulator
The Basler Electric SR4A1B05A3E is a solid-state static voltage regulator designed for brushless synchronous generators. It provides precise automatic voltage regulation by controlling the excitation current supplied to the generator field. The regulator uses SCR (silicon-controlled rectifier) technology to deliver high output current with low internal losses, ensuring reliable operation even under severe load variations. The SR4A series is well-known for its ruggedness, simplicity, and field-proven performance in industrial, marine, and standby power applications.
Key Features
SCR power stage for high efficiency and robust output
Voltage regulation accuracy within ±0.5 percent from no load to full load
Fast transient response with field forcing capability
Adjustable voltage setpoint and stability compensation
Volts per hertz limiting to prevent magnetic saturation
Underfrequency roll-off for smooth operation during speed dips
Soft start for controlled voltage build-up
LED status indicators for power and fault conditions
Compact and rugged enclosure for harsh environments
Technical Specifications
The SR4A1B05A3E operates from a 120 or 240 VAC auxiliary supply, 50/60 Hz. The voltage sensing input accepts 80 to 300 VAC. The regulator provides continuous field current up to 5 A with a peak capability of 10 A for forcing. The transient response time is less than 20 milliseconds. Operating temperature range is -30 to +65 degrees Celsius. The unit is rated for 95 percent non-condensing humidity and meets IEC 60068 environmental standards. Weight is approximately 3 kilograms.
Protection and Control Functions
Built-in protection includes overexcitation limiting to protect the generator rotor, underfrequency compensation to adjust voltage setpoint with frequency, and loss-of-sensing protection that reduces excitation if the sensing signal is lost. The regulator also features a manual control input for remote voltage adjustment via an external potentiometer. The soft-start function gradually increases voltage during startup, reducing mechanical stress on the generator.
Installation and Configuration
Mounting is typically on a control panel using four screws. Wiring connections are made via pluggable terminal blocks. Configuration involves setting the voltage setpoint using a potentiometer, adjusting the stability compensation to match the generator's dynamic response, and selecting the proper input voltage range via jumpers. Commissioning requires verification of voltage calibration and transient response under load steps.
Applications
The SR4A1B05A3E is widely used in diesel and gas generator sets, marine auxiliary generators, standby power systems, and industrial cogeneration plants. Its robust design makes it suitable for mobile and stationary installations where reliable voltage control is critical.
Compliance and Reliability
The regulator is manufactured under ISO 9001 quality management and complies with CE, UL, and CSA requirements. It has been tested for vibration, humidity, and temperature extremes. The solid-state design ensures long service life with minimal maintenance.
Conclusion
Basler Electric SR4A1B05A3E static voltage regulator delivers dependable and accurate voltage control for brushless generators. Its combination of SCR robustness, adjustable features, and protection functions makes it a trusted solution for demanding power generation applications.
