Advanced Adjusment of SX440 AVR Controls

STABILITY ADJUSTMENT

The AVR includes a stability or damping circuit to provide good steady state and transient performance of the
generator.

The correct setting can be found by running the generator at no load and slowly turning the stability control anti-clockwise until the generator  voltage starts to become unstable. 

Voltage Adjusment of SX440 AVR Controls

VOLTAGE ADJUSTMENT

The generator output voltage is set at the factory, but can be altered by careful adjustment of the VOLTS control on the AVR board, or by the external hand trimmer if fitted. Terminals 1 and 2 on the AVR will be fitted with a shorting link if no hand trimmer is required. 

CAUTION  Do not increase the voltage above the rated generator voltage.  If in doubt, refer to the rating plate mounted on the generator case.

Design Detail SX440 AVR

The main functions of the AVR are:

Potential Divider and Rectifier takes a proportion of the generator output voltage and attenuates it. The potential divider is adjustable by the AVR Volts potentiometer and external hand trimmer (when fitted). The output from the droop CT is also added to this signal. An isolating transformer is included allowing connection to various winding configurations. A rectifier converts the a.c. input signal into d.c. for further processing.