DESCRIPTION

SX460 is a half-wave phase-controlled thyristor type Automatic  Voltage Regulator (AVR) and forms part of the excitation system for  a brush-less generator. In addition to regulating the generator  voltage, the AVR circuitry includes under-speed and sensing loss  protection features. Excitation power is derived directly from the  generator terminals.
Positive voltage build up from residual levels is ensured by the use  of efficient semiconductors in the power circuitry of the AVR.
The AVR is linked with the main stator windings and the exciter  field windings to provide closed loop control of the output voltage  with load regulation of +/-1.0%.
In addition to being powered from the main stator, the AVR also  derives a sample voltage from the output windings for voltage  control purposes. In response to this sample voltage, the AVR  controls the power fed to the exciter field, and hence the main  field, to maintain the machine output voltage within the specified  limits, compensating for load, speed, temperature and power factor  of the generator.
A frequency measuring circuit continually monitors the generator  output and provides output under-speed protection of the excitation  system, by reducing the output voltage proportionally with speed  below a pre-settable threshold. A manual adjustment is provided for  factory setting of the under frequency roll off point, (UFRO). This  can easily be changed to 50 or 60 Hz in the field by push-on link  selection.
Provision is made for the connection of a remote voltage trimmer,  allowing the user fine control of the generator's output.

SPECIFICATION

INPUT
Voltage: Jumper selectable 95-132V ac or 190-264V 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% (see note 1)

THERMAL DRIFT
0.05% per deg. C change in AVR ambient (note 2)

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 (see note 3)

UNDER FREQUENCY PROTECTION
Set point: 95% Hz (see note 4)
Slope: 170% down to 30 Hz

UNIT POWER DISSIPATION
10 watts maximum

BUILD UP VOLTAGE
4 Volts @ AVR terminals

ENVIRONMENTAL
Vibration: 20-100 Hz 50mm/sec
100Hz -2kHz 3.3g
Operating temperature: -40 to +70º C
Relative Humidity: 0-70º C 95% (see note 5)
Storage temperature: -55 to +80º C

NOTE

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.

WHAT'S IN THE PACKAGE

• 1 x SX460 Automatic Voltage Regulator