Attention please! 

The AVR SX460 is now obsolete and replaced by the AVR AS440. The production of original Stamford AVR SX460 is definitely discontinued. You probably can still find some stock units in the market, or you can choose the quality good China made repalcement ones.

The SX460 is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR). The AVR is linked with the main stator windings and the exciter field windings to provide closed loop control of the output voltage.

The SX460 is most commonly used on Stamford alternator UC range and are supplied as standard to the UC22 and UC27 alternators.

Technical specification:

INPUT

• Voltage: Jumper selectable, 95-132V ac or190-264V ac

• Frequency: 50-60 Hz nominal

• Phase: 1

OUTPUT

• Voltage: max 90V dc at 207V ac input

• Current: continuous 4 A dc, Intermittent 6 A for 10 secs

• Resistance: 15 ohms minimum

REGULATION

• +/- 1.0%  

THERMAL DRIFT

• 0.05% per deg. C change in AVR ambient 

TYPICAL SYSTEM RESPONSE

• AVR response: 20 ms

• Filed current to 90%: 80 ms

• Machine Volts to 97%: 300 ms

EXTERNAL VOLTAGE ADJUSTMENT

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

UNDER FREQUENCY PROTECTION

• Set point: 95% Hz  

• Slope: 170% down to 30 Hz

ENVIRONMENTAL

• Vibration: 20-100 Hz 50mm/sec

                  100Hz – 2kHz 3.3g

• Operating temperature: -40 to +70°C

• Relative Humidity: 0-70°C 95%  

• Storage temperature: -55 to +80°C

NOTES

1) With 4% engine governing

2) After 10 minutes.

3) Applies to Mod status F onwards. Generator de-rate may

apply. Check with factory.

4) Factory set, semi-sealed, jumper selectable

5) Non condensing.