Sincro RD1 - Adjustments; Voltage Adjustment; Stability Adjustment; Under Frequency Knee Adjustment

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ADJUSTMENTS
VOLTAGE ADJUSTMENT
Adjusting the trimmer “V” changes the output voltage.
Take the generating set to its nominal speed and turn until the required voltage is obtained.
If a small variation in speed causes a voltage variation, then the underspeed protection trimmer
“UF” should first be calibrated.
Adjusting the “V” trimmer, the ranges are the following:
- DIP-switch on 115 V position, range 100÷130 V
- DIP-switch on 230 V position, range 185÷245 V
- DIP-switch on 400 V position, range 340÷460 V
- DIP-switch on 480 V position, range 440÷520 V.
STABILITY ADJUSTMENT
If there are voltage fluctuations, adjust the potentiometer “ST”, which modulates the reaction time
of the regulator to external inputs, thereby eliminating any instability in the alternator-load system.
UNDER FREQUENCY KNEE ADJUSTMENT
AVR RD1 incorporates an underspeed protection circuit (UF) which gives a volts/Hz characteristic
when the alternator speed falls below a presettable threshold known as the "knee" point.
The UF knee adjustment is preset at factory at the 47Hz on a 50Hz system or 57Hz on a 60Hz
system. Selection of 50 / 60Hz can be made using the DIP-Switches.
The figures below show the curves for voltage variation as a function of frequency variation.
For nominal frequency operation, UF is disabled. When rotation decreases (e.g. when shutting
down), excitation decreases, reducing the output voltage of the alternator.
The pre-set "knee" point can be altered, by UF trimmer, according to the needs of each application.
Under frequency “knee”: a) 50 Hz system, b) 60 Hz system