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9 OPERATION
9.1 VOLTAGE REGULATOR
It compares the actual output voltage from the alternator with the theoretical adjusted value through the trimpot of voltage adjustment
P1, plus the external voltage adjustment (if any). The error is processed by the sensing loop whose value determines the thyristor
firing angle which may vary from 0 to 180°, thus controlling the output voltage of the alternator.
9.2 POWER CIRCUIT CONNECTION
The alternator voltage or the auxiliary winding voltage is connected to the terminals 3 and E3/4. This rectified voltage is applied, in
a controlled fashion, to the alternator exciter field.
9.3 FIELD FLASHING
Generation begins through the residual voltage of the alternator. Once the voltage has reached about 10% of the nominal voltage,
the regulator controls the alternator voltage causing it to rise through the initial ramp in approximately 3 seconds. When the alternator
reaches its nominal value, the PID control loop will maintain the alternator output voltage constant within the adjusted value.
9.4 U/F OPERATION
This operation is determined at jumper of selection of operation frequency., following the logic at the membrane and the instructions
below:
▪
Hz 60 = 60 Hz
▪
Hz 50 = 50 Hz
The adjustment of operation is automatic made by the voltage regulator.
U/f
14 l Automatic Voltage Regulator – GRTA-2D
U
n
Frequency (Hz)
45
50
Figure 9.1: U/F operation
U
n
U/f
Frequency (Hz)
54
60
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