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Basic Product Description
MA330 AUTOMATIC VOLTAGE REGULATOR Specification, Installation, and Adjustments Manual
General Description
The MA330 AVR is a three phase full wave, pulse width modulated type automatic voltage regulator
(AVR) and forms part of the excitation system of the brushless generator.
Excitation power is derived from a shaft mounted three phase permanent magnet generator (PMG) which
provides an isolated supply to the AVR control circuits. The independent PMG assures the performance
of the AVR against non-linear loads and reduces the radio frequency interference on the generator
terminals. The PMG supply enables the generator to maintain current into a short circuit.
The AVR senses the voltage on the main generator winding either directly or via transformers. This signal
is used to control the power fed to the exciter stator (and hence the main rotor) to maintain the generator
output voltage within the specified limits, compensating for load, speed, temperature and power factor.
Three phase RMS sensing is employed for superior voltage regulation.
Provision is made for the connection of a remote trimmer allowing the user fine control of the generator
output voltage.
Soft-start circuitry is included to provide a smooth controlled build up of generator output voltage.
A frequency measuring circuit continually monitors the speed of the generator to provide protection of the
excitation system. This operates by reducing the generator output voltage proportionally with speed below
an adjustable threshold. A further enhancement of this feature is an adjustable ‘volts per Hertz’ slope (dip)
and a delayed voltage recovery (dwell) both designed to improve speed recovery time when the
generator is used in conjunction with turbo-charged engines.
Protection circuitry is included which cuts off the excitation power in event of over-voltage or overexcitation
caused by malfunction or excessive load on the generator. The over-voltage protection
requires additional wiring between the AVR and the main generator windings. An output signal is
produced which can be used to trip an external protection device in the even of over-voltage or overexcitation.
Both conditions remain latched until the generator has stopped.
Excitation limiting [PWL] allows control over the amount of current flowing during overload of the
generator output.
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