AVR MX341 Automatic Voltage Regulator Module For Stamford Generator

?

Feature:
MX341 is a two phase sensed Automatic Voltage Regulator and forms part of the excitation system for a brush-less generator. Excitation
power is derived from a three-phase permanent magnet generator (PMG), to isolate the AVR control circuits from the effects of nonlinear
loads and to reduce radio frequency interference on the generator terminals. Sustained generator short circuit current is another feature of the PMG system.

The AVR senses the voltage in the main generator winding and controls the power fed to the exciter stator and hence the main rotor to
maintain the generator output voltage within the specified limits, compensating for load, speed, temperature and power factor of the generator.

Soft start circuitry is included to provide a smooth controlled build up of generator output voltage.

A frequency measuring circuit continually monitors the shaft speed of the generator and provides under-speed protection of the excitation
system by reducing the generator output voltage proportionally with speed below a pre-settable threshold. A further enhancement of this
feature is an adjustable volts per Hertz slope to improve engine recovery time on turbo charged engines. Soft start circuitry is included to
provide a smooth controlled build up of generator output voltage.

Uncontrolled excitation is limited to a safe period by internal shutdown of the AVR output device. This condition remains latched until the generator has stopped.

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.

Specifics:
Condition: 100% Brand New
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% (see note 1)
THERMAL DRIFT

0.03% per oC change in AVR ambient (note 2)
SOFT START RAMP TIME

3 seconds
TYPICAL SYSTEM RESPONSE

AVR Response 10 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
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
OVER EXCITATION PROTECTION

Set point 75 V dc
Time delay 10 seconds (fixed)
ENVIRONMENTAL

Vibration 20-100 Hz 50mm/sec
100Hz – 2kHz 3.3g
Operating temperature -40 to +70oC
Relative Humidity 0-70oC 95% (see note 6)
Storage temperature -55 to +80oC

NOTES:
1. With 4% engine governing.
2. After 10 minutes.
3. Applies to Mod status D 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.

Package Included:
1 X Product Instructions
1 X MX341 Automatic Voltage Regulator

Warranty:
Returns: Customers have the right to apply for a return within 60 days after the receipt of the product
24-Hour Expert Online: Solve your installation and product problems