The MX341 is an analogue, 2-phase sensing, permanent magnet generator (PMG) powered automatic voltage regulator (AVR) providing isolation from the effects of non-linear loads. It has improved motor starting performance and sustained short circuit current.

The MX341 is provided as standard for the STAMFORD P6, STAMFORD P7 and STAMFORD S7 alternators.

Technical specification:

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

• 0.03% per deg. C change in AVR ambient

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

UNDER FREQUENCY PROTECTION

• Set point: 95% Hz

• Slope 170% down to 30 Hz

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: 0.07 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 +70°C

• Relative Humidity: 0-70°C 95%  

• Storage temperature: -55 to +80°C

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.