3 SINCRO® is a brand of Soga Energy Team ITALY | sogaenergyteam.com | info.sincro@sogaenergyteam.com
GENERAL FEATURES
SINCRO BL4-U is a half-wave phase-controlled thyristor type Automatic Voltage Regulator (AVR)
and is part of the alternator excitation system.
In addition to the regulation of the alternator voltage, BL4-U circuitry includes under-speed
protection features. Excitation power is derived directly from the alternator terminals.
Positive voltage build up from residual levels is ensured by the use of efficient semiconductors in
the power circuitry of AVR BL4-U.
AVR BL4-U is connected with the main stator windings and the exciter field windings to provide
closed loop control of the output voltage.
In addition to being powered from the main stator, AVR BL4-U also derives a sample voltage from
the output windings for voltage control purposes. In response to this sample voltage, AVR BL4-U
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 alternator.
A frequency measuring circuit continually monitors the alternator output and provides output 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, (UF). This can easily be changed to 50 or 60 Hz with two dip switches.
Provision is made for the connection of a remote voltage potentiometer, allowing the user fine
control of the alternator's output.
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