MX341 is a two phase sensed Automatic Voltage Regulator(AVR) and forms part of the exciation 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 control the power fed to the exciter stator and hance the main rotor to maintain the generator output

voltage within the specified limits,compensating for load sprrd,temperature and power factor of the generator


The AVR has the faclity for droop CT connection,to allow parallel running with other similarly equipped generators.

Technical specification

SENSING INPUT

Voltage 190-264V ac max, 1 phase 2 wire

Frequency 50-60HZ nominal

POWER INPUT

Voltage 140-220 V ac max, 3 phase,3 wire

CURRENT: 3A/phase

Frequency 100-120HZ nominal

OUTPUT

Voltage max 120V dc

Current continuous 2.7A dc

Intermittent 6A for 10 secs

Resistance 15 ohms minimum

REGULATION

+/-1%

THERMAL DRIFT

0.03% per deg.C change in AVR ambient

SOFT START PAMP TIME

3 sec

TYPICAL SYSTEM RESPONSE

AVR respone 10ms

Filed current to 90% 80ms

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 30HZ

UNIT POWER DISSIPATION

12 watts maximum

ANALOGUE INPUT

Maximum input +/-5V dc

Sensitivity 1V for 5% Generator Volts(adjustable)

Input resistance 1k ohm

QUADRATURE DROOP INPUT

10 ohms burden

Max.sensitivity:0.07A for 5% droop OPF

Max.input:0.33A

OVER EXCITATION PROTECTION:

Set point:75vdc

Time relay:10sec

Environmental

Vibration 20-100HZ 50mm/sec

100Hz 2kHz 3.3g

Operating temperature -40 to +70 C

Relative Humidity 0-70C 95%

Storage temperature -55 to +80 C






 

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