Voltage Regulator MX341 MX321
AS440 Stamford Generator AVR Automatic Alternator Regulator
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SENSING INPUT
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Voltage
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190-264V ac
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Frequency
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50-61 Hz nominal
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phase
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1
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Wire
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2
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OUTPUT
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Voltage
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max 90V dc at 207V ac input
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Current
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continuous 4A dc, intermittent 6A for 10 secs
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Resistance
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15 ohms minimum
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REGULATION
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+/- 1.0%
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THERMAL DRIFT
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0.04% per deg. C change in AVR ambient
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TYPICAL SYSTEM RESPONSE
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AVR response
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20ms
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Filed current to 90%
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80 mS
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Machine Volts to 97%
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300 mS
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EXTERNAL VOLTAGE
ADJUSTMENT
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’+/-10% with 1 k ohm 1 watt trimmer
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UNDER FREQUENCY
PROTECTION
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Set point
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95% Hz
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Slope
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170% down to 30 Hz
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UNIT POWER DISSIPATION
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12 watts maximum
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BUILD UP VOLTAGE
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4 Volts @ AVR terminals
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ANALOGUE INPUT
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Maximum input
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+/- 5 Vdc
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Sensitivity
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1v for 5%
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Input resistance
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1k ohm
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QUADRATURE DROOP INPUT
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10 ohms burden
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Max. sensitivity: 0.07 A for 5% droop 0PF
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Max. input: 0.33A
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ENVIRONMENTAL
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Vibration
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20-100 Hz,50mm/se
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100Hz - 2kHz, 3.3g
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Operating temperature
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-40 to +70 Deg. C
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Relative Humidity 0-70 Deg. C
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95%
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Storage temperature
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-55 to +80 Deg. C
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SX440
●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 +/-0.5%.
