AS540 Automatic Voltage Regulator (AVR) | Stamford Generator Set Spare Parts

The AS540 is an analog, 2-phase sensing, self-excited automatic voltage regulator, featuring an interface for an optional auxiliary winding to improve motor starting performance and sustain short-circuit current. The Stamford AS540 Automatic Voltage Regulator offers superior control with features such as Voltage Control, Stability Control, Under-Frequency Roll-Off, and Over-Excitation Control. It has a power input voltage of 95-265V AC (1 phase) and a nominal frequency of 50-60 Hz. The power output voltage is 82V DC at a 200V AC input.

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 seconds
  • Resistance: Minimum 15 Ω

  Regulation:

  • ± 1.0% RMS

  Thermal Drift:

  • 0.03% per 1 °C change in AVR ambient temperature

  External Voltage Adjustment:

  • ± 10% with 1 kΩ, 1 W trimmer

  Under-Frequency Protection:

  • Set point: 94% to 98% Hz

  Unit Power Dissipation:

  • Maximum: 12 W

  Build-up Voltage:

  • 5 VAC at AVR terminals

  Over-Voltage Detection:

  • Set point: 65 VDC
  • Time delay: 10 to 15 seconds