MX321

Automatic Voltage Regulator

• MX321 is a three phase sensed Automatic Voltage
  Regulator and forms part of the excitation system for a
  brush-less generator. Excitation power is derived from a
  three-phase permanent magnet generator (PMG), to
  isolate the AVR control circuits from the effects of non-
  linear loads and to reduce radio frequency interference on
  the generator terminals. Sustained generator short circuit
  current is another feature of the PMG system.
• The AVR senses the voltage in the main generator winding
  and controls the excitation to maintain the generator output
  voltage within the specified limits, compensating for load,
  speed, temperature and power factor of the generator.
  Three phase RMS sensing is employed for superior
  voltage regulation.
• Adjustable Soft start circuitry is included to provide a
  smooth controlled build up of generator output voltage.
• A frequency measuring circuit continually monitors the
  shaft speed of the generator and provides under-speed
  protection of the excitation system by reducing the
  generator output voltage proportionally with speed below a
  pre-settable threshold. A further enhancement of this
  feature is an adjustable volts per Hertz slope and voltage
  recovery time, to improve the response of turbo charged
  engines.
• Current limiting may be included to allow control over the
  amount of sustained short circuit current.
• Maximum excitation is limited to a safe period by internal
  shutdown of the AVR output device. This condition remains
  latched until the generator has stopped.
• The AVR includes an over-voltage protection feature with
  internal shutdown of the AVR output device, plus the ability
  to trip an optional excitation circuit breaker if required.
• 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 a
  Newage Power Factor controller or other external device
  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.