Stamford Newage AVK SEG SA465-2 Automatic Voltage Regulator, US $95.00 – Picture 0

Stamford Newage AVK SEG SA465-2 Automatic Voltage Regulator, US $95.00 – Picture 1

Stamford Newage Avk Seg Sa465-2 Automatic Voltage Regulator

US $95.00

Madison, Alabama, United States
Jan 30th

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SA465 AUTOMATIC VOLTAGE REGULATOR (AVR) SPECIFICATION, INSTALLATION AND ADJUSTMENTS General description Technical specification SA465 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. Excitation power is derived directly from an auxiliary winding within the generator stator, providing sustained short circuit current. Alternatively, the unit can be powered from the main stator winding when short circuit performance is not required. 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 presettable 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. An analogue input is provided allowing connection to a Newage Power Factor controller or other external devices with compatible output. The AVR has the facility for droop CT connection, to allow parallel running with other similarly equipped generators. SENSING INPUT Voltage Jumper selectable 100-130V ac 1 phase or 190-264V ac 1 phase Frequency 50-60 Hz nominal POWER INPUT Voltage 100-264 V ac 1 phase Frequency 50-60 Hz nominal OUTPUT Voltage 85 V d.c. @ 207V a.c. Current continuous 4A transient 7.5A for 10 secs. Resistance 15 ohms min (10 ohms min when input volts is less than 175V ac) REGULATION +/- 1.5% (see note 1) THERMAL DRIFT 0.04% per deg. C change in AVR ambient (see note 2) 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 3) UNDER FREQUENCY PROTECTION Set point 95% Hz (see note 4) Slope 170% down to 30 Hz UNIT POWER DISSIPATION 12 watts maximum BUILD UP VOLTAGE 4 Volts @ AVR terminals ANALOGUE INPUT Maximum input +/- 5V dc (see note 5) 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 ENVIRONMENTAL Vibration 20-100 Hz 50mm/sec 100Hz – 2kHz 3.3g Operating temperature -40 to +70°C Relative Humidity 0-70°C 95% (see note 6) Storage temperature -55 to +80°C NOTES 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. Any device connected to the analogue input must be fully floating (galvanically isolated from ground), with an insulation strength of 500V ac. 6. Non condensing. DESIGN DETAIL TD_SA465.GB_05.03_02 The main functions of the AVR are: Potential Divider and Rectifier takes a proportion of the generator output voltage and attenuates it. The potential divider is adjustable by the AVR Volts potentiometer and external hand trimmer (when fitted). The output from the droop CT is also added to this signal. A rectifier converts the a.c. input signal into d.c. for further processing. The DC Mixer adds the analogue input signal the Sensing signal. The Amplifier (Amp) compares the sensing voltage to the Reference Voltage and amplifies the difference (error) to provide a controlling signal for the power devices. The Ramp Generator and Level Detector and Driver infinitely control the conduction period of the Power Control Devices and hence provides the excitation system with the required power to maintain the generator voltage within specified limits. The Stability Circuit provides adjustable negative ac feedback to ensure good steady state and transient performance of the control system. The Low Hz Detector measures the period of each electrical cycle and causes the reference voltage to be reduced approximately linearly with speed below a presettable threshold. A Light Emitting Diode gives indication of underspeed running. The Synchronising circuit is used to keep the Ramp Generator and Low Hz Detector locked to the generator waveform period. The Low Pass Filter prevents distorted waveforms affecting the operation of the AVR control circuit. The Short Circuit Detector senses the presence of a short circuit on the generator output and forces the Power Control Devices into full conduction. This only occurs when the AVR is powered from an auxiliary winding. Power Control Devices vary the amount of exciter field current in response to the error signal produced by the Amplifier. Suppression components are included to prevent sub cycle voltage spikes damaging the AVR components and also to reduce the amount of conducted noise on the generator terminals. The Power Supply provides the required voltages for the AVR circuitry.

Condition:	New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...	Brand	Newage Genuine Newage International Part
Country/Region of Manufacture	United Kingdom
Model	SA465-2