GENERAL
TheĀ M40FA644A is a analog automatic voltage regulator made by Marelli in Italy. Special add-on 630-800 frames. This regulator senses 3 phases and adjusts excitation when needed.Ā An external potentiometer can be installed to adjust voltage (sold separately)
APPLICATIONS
CORRESPONDING, ASSOCIATED & OBSOLETEĀ PART NUMBERS
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The MA330 is used on large AVK generator ends. Although this regulator has already been discontinued the demand for this product is still very high. This AVR is still available for sale as a spare aftersales part. The new replacement is the new DM110 digital automatic voltage regulator.
This regulator needs to be used with a permanent magnet generator (PMG)
The MX321-2 automatic voltage regulator is used on larger Stamford generator alternator ends. Ā These units are installed as a standard from factory on alternator ends HC6 and P7 stamford frames. This regulator allows 3 phase sensing which is constantly sensing the voltages across all 3 lines vs just 2 lines like on other standard AVRs. As an added benefit the regulator enables quadrature droop input, this enables the chance for multiple synchronizing across many generator sets.
