Stamford MX341 Voltage Regulator AVR

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Product Description

Product Description

Stamford’s MX341 Voltage Regulator AVR provides safe, steady and controlled generator output voltage


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The Stamford MX341 Voltage Regulator AVR provides a steady, safe and controlled buildup of generator output voltage, making this voltage regulator a multifaceted yet stable model, which can be paired with similar products.

Product overview 

The MX341 features a two-phase Automatic Voltage regulator, which makes up a part of the excitations system for the brushless generator.

The MX341 features a three-phase permanent magnet generator (PMG). This helps to ensure low Radio Frequency Interference and helps protect against thyristor type loads. 

Additionally, this ensures preset output voltage specifications are maintained by feeding power to the exciter stator and main rotor in a controlled way. It does so by compensating for the temperature, load, power and speed of the generator. 

Safety benefits

The AVR circuitry has a number of protective features to ensure control over the generator, and the inclusion of soft start circuitry provides a smooth buildup of output voltage. The MX341 monitors the shaft speed of the generator and ensures the excitation system is provided with under-speed protection.

Additionally, the MX341 features turbocharged engines with improved frequency recovery time thanks to an adjustable volts/Hz slope.

Stamford’s MX341 provides a number of features that grant the user more control over the generator, and that guarantee safety in the process.

The AVR output device has an internal shutdown ability, to prevent uncontrolled over-excitation, and until the the generator is shut down this remains latched. The user has greater control of the generator’s output, thanks to a provision that allows a remote voltage trimmer to be connected. The soft start circuit provides a linear rising voltage, and the stability circuit provides adjustable ac feedback to maintain steady performance of the control system.

The MX341 features an overload detector, which shuts down the output device if overloads last more than 10 seconds. The overload detector continuously monitors the excitation level and sends shutdown signals. If overload occurs, the generator will be stopped and will need to be reset.

 Technical data

Sensing Input  Voltage  190-264V ac max, 1 phase, 2 wire
 Frequency  50-60 Hz nominal
 Power Input(PMG  Voltage  140-220V ac max, 3 phase, 3 wire
 Current  3A/phase
 Frequency  100-120 Hz nominal
 Output  Voltage  Max 120V dc
 Current  Continuous 2.7 A
Intermittent 6A for 10 secs
 Resistance  15 ohms minimum
 Regulation  +/- 1%
 Thermal Drift  0.02% per Deg. C change
In AVR ambient
 0.03% per Deg. C change
In AVR ambient
 Soft Staret Ramp Time  3 seconds
 Typical system response  AVR response  10ms
 Filed current to 90%  80 ms
 Machine Volts to 97%  300ms
 External voltage adjustment  +/-10% with 1k ohm 1 watt trimmer
 Under frequency protection  Set point  95% Hz
 Slope  170% down to 30 Hz
 Unit power dissipation  12 watts maximum
 Analogue Input  Maximum input  +/- 5 Vdc
 Sensitivity  1v for 5% Generator Volts (adjustable)
 Input resistance  1k ohm
 Quadrature Droop Input  10 ohms burden
 Max. sensitivity: 0.22 A for
5% droop 0PF
 Max. sensitivity: 0.07 A for
5% droop 0PF
 Max. input: 0.33A
 Environmental  Vibration  20-100 Hz,50mm/se
 100Hz – 2kHz, 3.3g
 Operating temperature  -40 to +70 Deg. C
 Relative Humidity 0-70 Deg.
 Storage temperature  -55 to +80 Deg. C

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