Automatic Voltage Regulator AVR Sr7-2g for Diesel Generator

Error amplifier
Meccalte SR7-2G Automatic Voltage Regulator is a confrontation signal that is highly voltage-,temperature- and age-stabilised, and
which is generated inside the electronic regulator. The "VOLT" trimmer positioned on the regulator can modify its value. Each
reference signal variation corresponds to an output voltage variation.

Impulse width modulator
This part of the electronic regulator transforms the control signal into respective impulses that dirve the power SCRs, so that
the value of the generator continuous excitation voltage is changed.

Sensing for Meccalte Automatic Voltage Regulator SR7-2G
In this part of the circuit the alternator output voltage is suitably conditioned and applied to an AC/DC converter, the output
signal of which is compared to the reference signal.

Protection block of SR7-2G Meccalte Voltage Regulator
Figure 1 clearly shows that the part of the electronic regulator called the protection block is made up of two parts:
a) low frequency protection
b) overload protection.

Low frequency protection of SR7-2G Meccalte Automatic Voltage Regulator
The frequency-voltage converter is a fundamental part of the protection block. When the frequency of the output voltage falls
below the value of a given threshold, the output signal of this block produces a control signal which lowers the output voltage of
the generator, in order to stop over excitation (a typical example is the lowering of the speed for the preheating of the prime
mover).
As can be seen from figure 3, when the output voltage frequency of the generator falls by more than 10% of the nominal value, the
output voltage reduces in line with the frequency (-7,6V/Hz).

Package list:
1 * Voltage Regulator
1 * User manual

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