General Description / Specifications
SX440 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 +/- 1.5%.
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 pushon link selection. Provision is made for the connection of a remote voltage trimmer, allowing the user fine control of the generator's output.
��� > Voltage Jumper selectable 95-132V ac or 190-264V ac
��� > Frequency 50-60 Hz nominal
��� > Phase 1
��� > Voltage max 90V dc at 207V ac input
��� > Current continuous 4 A dc Intermittent 6 A for 10 secs
��� > Resistance 15 ohms minimum
��� > +/- 1.5%
��� > 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
UNIT POWER DISSIPATION
��� > 10 watts maximum
BUILD UP VOLTAGE
��� > 4 Volts @ AVR terminals
��� > 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
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.
Stamford Alternator BC16, BC18, UC22, �UC27
InGENERAL POWERwe�understand�the urgency of your�requirements for emergency and back up generators, and we have committed by establishing automatic voltage regulator stock of 500+ units in Miami Florida generator stock of 300+ units in Miami Florida currently serving:
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