AS440

Automatic Voltage Regulator

• AS440 is a half wave phase controlled thyristor type AVR
  and forms part of the excitation system for a brushless
  generator. The design employs Surface Mount Technology
  (SMT) for high integration of features in a small footprint
  AVR.
• Positive voltage build up from residual levels is ensured by
  the use of efficient semiconductors in the power circuitry of
  the AVR. The power and voltage sensing circuits have
  separate terminals, allowing the excitation power to be
  derived directly from the stator winding for basic
  applications or from an auxiliary winding if sustained short
  circuit performance is required.
• The AVR is linked with the main stator windings and the
  exciter field windings to provide closed loop control of the
  output voltage with load regulation of +/- 1.0%.
  The AVR voltage sensing terminals continuously sample
  the output windings for voltage control purposes. In
  response to this sample voltage, the AVR controls the
  power fed to the exciter field, and hence the main field, to
  maintain the machine output voltage within the specified
  limits, compensating for load, speed, temperature and
  power factor, of the generator.
• A frequency measuring circuit continually monitors the
  generator output and provides under-speed protection of
  the excitation system, by reducing the output voltage
  proportionally with speed below a pre-settable threshold. A
  manual adjustment is provided for factory setting of the
  under frequency roll off point, (UFRO). This can easily be
  changed to 50 or 60 Hz in the field by push-on link
  selection.
• Over excitation conditions are limited to a safe period by a
  protection circuit within the AVR.
  Provision is made for the connection of a remote voltage
  trimmer, allowing the user fine control of the generator’s
  output.
• An analogue input is provided allowing connection to the
  Power Factor controller or other external devices with
  compatible output.
• The AVR has the facility for droop CT connection, to allow
  parallel running with other similarly equipped generators.

• All manufacturer names and numbers are used for reference purpose only and do not imply that any part is the product of these manufacturer.