HT INDUSTRIAL AUTOMATION LIMITED

Automatic voltage regulator Stamford AVR AS440

AS440 Product Specification Download.pdf

High quality replacement model for Stamford AVR AS440 with reasonable price!

Replacement Models:AS440, AS480, SX440, SX460, MX341, MX321, MX450

Original Modules: AS440, AS480, SX460, MX341, MX321, MX450, MX342, MX330, EBC-1, RSK1001, RSK2001, RSK5001, RSK6001

The Brands mentioned here are for reference purpose only, our parts can exactly replace the original ones.

STAMFORD AS440 AVR is used in Stamford Cummins UC224 or UC274 generators. The AS440 offers an optional feature for paralleling with multiple generators.

The Stamford UC22 and UC27 Series alternators are using SX460 or AS440 AVR. A Permanent magnet generator powered excitation system is using MX341 and MX321 AVR.

Stamford UC22 alternator includes:

UCDI224C UCDI224D UCDI224E UCDI224F UCDI224G UCDI224V UCI224C UCI224D UCI224E UCI224F UCI224G UCI224V UCM224C UCM224D UCM224E UCM224F UCM224G

Stamford UC27 alternator includes:

UCDI274J UCDI274K UCI274C UCI274D UCI274E UCI274F UCI274G UCI274H UCM274C UCM274D UCM274E UCM274F UCM274G UCM274H

SAME AVR AS:

Stamford Voltage Regulator E000-24403/1P AVR

FG Wilson Voltage Regulator 10000-17096 AVR

Olympian Automatic Voltage Regulator 10000-17096 AVR

General description

Stamford Automatic voltage regulator AS440 is a half wave phase controlled thyristor type AVR and forms part of the excitation system for a brush-less generator. The design employs Surface Mount Technology (SMT) for high integration of features in a small footprint AVR.

Positive voltage build up from residual levels is ensured by the use of efficient semiconductors in the power circuitry of the AVR. The power and voltage sensing circuits have separate terminals, allowing the excitation power to be derived directly from the stator winding for basic applications or from an auxiliary winding if sustained short circuit performance is required.

The Stamford AS440 Automatic voltage regulator 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%.

The AVR voltage sensing terminals continuously sample 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 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.

Over excitation conditions are limited to a safe period by a protection circuit within the AVR AS440.

Provision is made for the connection of a remote voltage trimmer, allowing the user fine control of the generator's output.

An analogue input is provided allowing connection to a Newage Power Factor controller or other external devices with compatible output.

The AS440 Stamford AVR Voltage Regulator has the facility for droop CT connection, to allow parallel running with other similarly equipped generators.

Technical Specification: 

SENSING INPUT

Voltage Jumper selectable

100-130 Vac 1 phase or

190-264 Vac 1 phase

Frequency 50-60 Hz nominal

POWER INPUT

Voltage 100-264 V ac 1 phase

Frequency 50-60 Hz nominal

OUTPUT

Voltage 82 V d.c. @ 200 V a.c.

Current continuous 4A (see note 1).

transient 7.5A for 10 secs.

Resistance 15 ohms min

(10 ohms min when input

volts is less than 175 ac)

REGULATION

+/- 1.0% (see note 2)

THERMAL DRIFT

0.03% per deg. C change in AVR ambient (see note 3)

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 4)

Increasing resistance lowers voltage.

UNDER FREQUENCY PROTECTION

Set point 94 -98% Hz (see note 5)

UNIT POWER DISSIPATION

12 watts maximum

BUILD UP VOLTAGE

4 Volts @ AVR terminals

ANALOGUE INPUT

Maximum input +/- 5 Vdc (see note 6)

Sensitivity 1v for 5% Generator Volts (adjustable)

Input resistance 1k ohm

QUADRATURE DROOP INPUT

10 ohms burden

Max. sensitivity: 0.07 A for 5% droop 0PF

Max. input: 0.33 A

OVER EXCITATION PROTECTION

Set point 75 V dc

Time delay 10-15 seconds (fixed)

ENVIRONMENTAL

Vibration 20-100 Hz 50mm/sec

100Hz – 2kHz 3.3g

Operating temperature -40 to +70C (note 7)

Relative Humidity 0-70C 95% (note 8)

Storage temperature -55 to +80℃