SX440 Automatic Voltage Regulator

Send Message Request a Quote

SX440 automatic voltage regulator is a half-wave phase-controlled thyristor type machine, and it forms part of the excitation system for a brushless generator. In addition to regulating the generator voltage, its circuitry includes under-speed and sensing loss protection features, and 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. This product 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%.

Technical Parameters

Input	Voltage	190-264VAC
	Frequency	50-60Hz nominal
	Phase	1
	Wire	2
Output	Voltage	Max. 90VDC at 207VAC input
	Current	Continuous 4ADC Intermittent 6A for 10 seconds
	Resistance	Min. 15Ω
Regulation	±1% (note 1)
Thermal Drift	0.04% per degree C change in AVR ambient (note 2)
Typical System Response	AVR response	20ms
	Filed current to 90%	80ms
	Machine volts to 97%	300ms
External Voltage Adjustment	±10% with 1KΩ 1W trimmer (note 3)
Under Frequency Protection	Set point	95% Hz (note 4)
	Slope	170% down to 30Hz
Unit Power Dissipation	Max. 12 watts
Build Up Voltage	4 volts at AVR terminals
Analogue Input	Max. input	±5VDC (note 5)
	Sensitivity	1V for 5% generator volts (adjustable)
	Input resistance	1kΩ
Quadrature Droop Input	10 ohms burden
	Max. sensitivity	0.07A for 5% droop 0PF
	Max. input	0.33A
Environmental	Vibration	20-100 Hz	50mm/sec
		100Hz–2kHz	3.3g
	Operating temperature	-40 ~ 70°C
	Relative humidity 0-70°C	95% (note 6)
	Storage temperature	-55 ~ 80°C

Note
1. With 4% engine governing.
2. After 10 minutes.
3. Applies to Mod status S onwards. Generator de-rate may apply. Check with factory.
4. Factory set, semi-sealed, jumper selectable.
5. Any device connected to the analogue input must be fully floating (galvanically isolated from ground), with an insulation strength of 500VAC.
6. Non condensing.

In addition to being powered from the main stator, this regulator also obtains a sample voltage from the output windings for voltage control purpose. In response to the sample voltage, this product 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.

On the other hand, 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. Meanwhile, an analogue input is provided allowing connection to a Newage power factor controller or other external devices with compatible output. In addition, this voltage regulator has the facility for droop CT connection to allow parallel running with other similarly equipped generators.

As a specialized automatic voltage regulator manufacturer and supplier in China, our company offers alternator voltage regulator, electric generator, diesel engine powered alternator, diesel synchronous generator, and more.

Related Names
Electric Pressure Adjusting Tool | Current Tension Regulating Device | Current Pressure Monitoring Parts

Scan QR to Read
Links：https://globefindpro.com/products/62028.html