A quality Stamford type SX460 half-wave phase-controlled thyristor type Automatic Voltage Regulator (AVR). This solid state unit forms part of the exciation system for many Stamford brushless generators and  regulates the generators voltage, the AVR circuitry includes under speed and sensing loss protection features.

Excitation power is derived directly from the generators termainals. Positive voltage build up from residual levels is ensured by the use of effcient semiconductors in the power circuitry of the AVR. Provision is made for the connection of a remote voltage trimmer allowing the user fine control of the generator’s output.

Technical specifications.

INPUT

       Voltage, Jumper selectable 95-132V ac or 190-264V ac

       Frequency     50-60HZ nominal

       Phase 1

OUTPUT

       Voltage  max 90V dc at 207V ac input

       Current  continuous 4A dc

       Intermittent 6A for 10 secs

       Resistance  15 ohms minimum

REGULATION

       +/-1%

THERMAL DRIFT

       0.05% per deg.C change in AVR ambient

TYPICAL SYSTEM RESPONSE

       AVR respone  20ms

       Filed current to 90%   80ms

       Machine Volts to 97%   300ms

EXTERNAL VOLTAGE ADJUSTMENT

       +/-10% with 1k ohm 1 watt trimmer

UNDER FREQUENCY PROTECTION

        Set point   95%HZ

        Slope  170% down to 30HZ

UNIT POWER DISSIPATION

        10 watts maximum

BUILD UP VOLTAGE

        4 Volts @ AVR terminals

        Environmental Vibration    20-100HZ  50mm/sec 100Hz 2kHz  3.3g

        Operating temperature  -40 to +70 C

        Relative Humidity 0-70C 95%

        Storage temperature  -55 to +80 C