NEWAGE MA330 AVR FOR NEWAGE ALTERNATORS
General Description / Specifications
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
> Sensing input: 170 … 250 Vac. max 50 … 60 Hz nominal. 1 or 3 Phase. 2 or 3 Wire
> Power input (PMG): 140 … 220 Vac max. 100 … 120 Hz nominal. 3 Phase, 3 Wire.
> Output: 180 V dc (max @ 1800 rpm)
> Regulation: +/- 0.5% RMS (inclusive of 4% engine governing)
Standard Applications PMG