GENERATOR AVR SX440 VOLTAGE REGULATOR
Warranty: 1 Year
Gross Weight: 0.4kgs
Stock Status: In stock
Part No. : SX440
Replaced Brand: Stamford
Function: Stamford AVR SX440
Usage: SX460 Stamford AVR
Compatible with: Stamford SX440 AVR
General description
SX440 VOLTAGE REGULATOR is a half-wave phase-controlled thyristor type Automatic Voltage Regulator (VOLTAGE REGULATOR) and forms part of the excitation system for a brush-less generator.
In addition to regulating the generator voltage, the VOLTAGE REGULATOR 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 VOLTAGE REGULATOR.
The Stamford Generator VOLTAGE REGULATOR SX460 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 VOLTAGE REGULATOR also derives a sample voltage from the output windings for voltage control purposes. In response to this sample voltage, the VOLTAGE REGULATOR 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 pushon link selection.
Provision is made for the connection of a remote voltage trimmer, allowing the user fine control of the generator's output.
Technical 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 of Stamford SX460 Generator VOLTAGE REGULATOR
+/- 1.0% (see note 1)
THERMAL DRIFT
0.05% per deg. C change in VOLTAGE REGULATOR ambient (note 2)
TYPICAL SYSTEM RESPONSE
VOLTAGE REGULATOR 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 @ VOLTAGE REGULATOR terminals
ENVIRONMENTAL of Stamford SX460 Generator Voltage Regulator
Vibration 20-100 Hz 50mm/sec
100Hz - 2kHz 3.3g
Operating temperature -40 to +70°C
Relative Humidity 0-70°C 95% (see note 5)
Storage temperature -55 to +80°C
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