AVR SX440 | Generic Replacement AS440

The SX440 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator and forms part of the excitation system for a brushless generator.

INPUT

Voltage: 190 – 264V ac

Frequency: 50-60 Hz nominal. Phase:1 Wire: 2

OUTPUT

Voltage: max 90V dc at 207 V ac input

Current: continuous 4A dc

Intermittent 6A for 10 secs 

Resistance: 15 ohms minimum

REGULATION: +/- 1% 

THERMAL DRIFT: 0.04% per deg. C change in AVR ambient.

TYPICAL SYSTEM RESPONSE

AVR response 20ms

Field current to 90% 80ms

Machine Volts to  97% 300ms

EXTERNAL VOLTAGE ADJUSTMENT: +/-10% with 1 k ohm 1 watt trimmer

UNDER FREQUENCY PROTECTION: Set point:95% Hz. Stope:170% down to 30 Hz

UNIT POWER DISSIPATION:12 watts maximum

BUILD UP VOLTAGE: 4 Volts @ AVR terminals

ANALOGUE INPUT: Maximum input:+/-5V dc

Sensitivity: 1v for 5% Generator Volts

Input resistance 1k ohm