AVR AUTOMATIC VOLTAGE REGULATOR FOR GENERATOR MODEL MX341 by STAMFORD

AUTOMATIC VOLTAGE REGULATOR AVR MOD. MX341, DIGITAL, FOR STAMFORD ALTERNATORS AND MORE, GENERATOR SET VERSION

Item Description:

MX341 is a two-phase sensing AVR and is part of the excitation system for brushless generators.

The excitation power comes from three-phase permanent magnets (PMGs), isolate the AVR's control circuitry from the effects of nonlinear loads and reduce radio frequency interference on the generator terminals.

The short-circuit current sustained by the generator is another characteristic of the PMG system.

The AVR detects the voltage in the main winding of the generator and controls the power fed to the stator from the exciter, then to the main rotor to maintain the output voltage within set limits, compensating for: load, speed, temperature and power factor of the generator.

Soft start circuitry is included to provide control and regulate the output voltage of the generator.

A circuit allows the frequency to be measured and monitored continuously, providing underspeed protection from the excitation system by reducing the generator output voltage proportionally to the speed below a preset threshold.

A further enhancement to this feature is the adjustable Volts per Hertz slope to improve engine recovery time (e.g. turbocharged engines).

Soft start circuitry is included to provide a controlled and smooth build.

Uncontrolled excitation is limited to a safety period by internal shutdown of the device and this condition remains blocked until the generator set is stopped.

The connection of a remote voltage trimmer is provided, which allows the user precise control of the generator power.

An analog input is provided allowing connection to a Newage power factor controller or other external devices with compatible output.

The AVR features CT droop connection capability, to allow parallel operation with other similarly equipped generators.

Technical specifications:

DETECTION INPUT

• Voltage 190-264 V AC max, 1 phase, 2 wire

• Frequency 50-60 Hz nominal

INPUT POWER SUPPLY (PMG)

• Voltage 140-220 V AC max, three phase, 3 wires

• Current 3A/phase“Frequency 100-120 Hz nominal

PRODUCTION

• Maximum voltage 120 Vdc

• Continuous current 2.7 A

• Intermittent 6A for 10 seconds.

• Resistance 15 ohm minimum

REGULATION:+/- 1%

THERMAL DRIFT: 0.03% per °C variation in the environment

SOFT START RAMP TIME: 3 seconds

TYPICAL SYSTEM RESPONSE:

• AVR response 10 ms

• Current stored at 90%: 80 ms

• Machine volts at 97%: 300 ms

EXTERNAL VOLTAGE ADJUSTMENT:

• +/-10% with 1 k ohm 1 watt trimmer

UNDER FREQUENCY PROTECTION

• Setpoint: 95% Hz

• 170% slope up to 30 Hz

POWER DISSIPATION OF THE DRIVE

• 12 watts maximum

ANALOG INPUT:

• Max +/- 5 Vdc

• Sensitivity: 1 V for 5% Volt generator (adjustable)

• Input resistance: 1k ohm

DROOP INPUT IN SQUARE:

• Load of 10 ohm Max.

• Sensitivity: 0.07 A per 5% droop.

• Input: 0.33A

OVER-EXCITEMENT PROTECTION

• Setpoint: 75 Vdc - Delay 10 seconds (fixed)

ENVIRONMENTAL

• Vibration: 20-100 Hz 50mm/sec “100 Hz – 2 kHz 3.3 g“

• Operating temperature: -40 to +70°C

• Relative humidity: 0-70°C 95%

• Storage temperature from: -55 to +80°C

Package containing: 1.00 piece of AVR MX341 with related user and maintenance manuals and connection diagrams, guaranteed new.

Units in the box: 1

N.B. : It is specified that this product is a high quality universal spare part, it does not mean that it can be ADDED to Generators that are not equipped with AVR.