The AS540 is an analogue, 2-phase sensing, self-excited automatic voltage regulator incorporating an interface for the optional auxiliary winding for enhanced motor starting performance and sustained short circuit current. The Stamford AS540 Automatic Voltage Regulator enables superior control with features like: Voltage Control, Stability Control, Under-Frequency Roll-Off and Over-Excitation Control. Power input voltage is 95-265V AC 1 phase and Frequency 50-60 Hz nominal. Power output voltage is 82V dc @ 200V ac input.
Features of the AS540 Automatic Voltage Regulator
- Sensing Input: Voltage 95 VAC to 130 VAC 1 phase or 190 VAC to 265 VAC 1 phase
- Power Input: Voltage: 95 VAC to 265 VAC 1 phase only
- Power Output: Maximum 82 VDC at 200 VAC input. Current: Continuous 4 A; transient 7.5 A for 10 secs. Resistance: 15 Ω minimum
- Regulation: ± 1.0% RMS
- Thermal Drift: 0.03% per 1 °C change in AVR ambient temp.
- External Volatege Adjustment: ± 10% with 1 kΩ, 1 W trimmer
- Under-Frequency Protection: Set point 94% to 98% Hz
- Unit Power Dissipation: 12 W maximum
- Build-up Voltage: 5 VAC at AVR terminals
- Over-Voltage Detection: Set point – 65 VDC; Time delay – 10 s to 15 s
Benefits of using the AS540 Automatic Voltage Regulator
The AVR provides closed loop control by sensing the alternator output voltage at the main stator windings and adjusting the exciter stator flied strength. Voltage induced in the exciter rotor, rectified by the rotating diodes, magnetises the rotating main field which induces voltage in the main stator windings. A self excited AVR receives power from the alternator output terminals or a special auxiliary winding in the main stator winding.