Automatic Voltage Regulator

The SX440 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.

AVR SX440 Stamford



<± 0.5% Regulation

220/400 VAC Programmable Input

Rugged Compact Design

With Under Frequency Protection

Soft Start Voltage Ramping

EMI Suppression

Built-in Hihg Capacity 8Amp Fuse


Specifications :

Sensing lnput Voltage:380/220V,110/220V, 220/400VAC,3phase 4 wire,According to your requirement.

Power Input Voltage: 380/220V,110/220V, 220/400VAC,3phase 4 wire,According to your requirement

Output Voltage: Voltage max 90v dc at 207v ac input

Current: Continuous 6A

Intermittent : 12A for 10 secs.

Resistance: Min.10 Ohm, Max. 100 Ohm

Voltage Build-up: Residual volts at AVR terminal 5VAC

External Volts Adjustment: ±7% with 1K Ohm 10 watt Trimmer

Soft Start Ramp Time: 3sec.

Unit Power Dissipation: Max. 8 Watt

EMI Suppression: Internal Electromagnetic Interference Filtering

Thermal.Drift: 0.05% per change in AVR ambient

Under Frequency Protection: 60Hz system presets knee point at 57Hz

(Facto’1′ Settings): 50Hz system presets knee point at 47Hz

Volts Regulation: <± 0.5% (with 4% engine governing)



Vibration 3G@ 100-2KHz

Operating Temperature -40-65°C

Relative Humidity <95%

Storage Temperature -40-85 °C

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Author: mavinelectric

Electrical Power and Control Services

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