Newage Stamford MX321

Newage Stamford MX321
MX321 is a three 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 excitation to maintain the generator output voltage within the specified limits, compensating for load, speed, temperature and power factor of the generator. Three phase RMS sensing is employed for superior voltage regulation.

Please read the specification sheet for further details

SENSING INPUT Voltage 190-264V ac max, 2 or 3 phase
  Frequency 50-60 Hz nominal
   
POWER INPUT (PMG) Voltage 170-220V ac max, 3 phase, 3 wire
  Current 3A/phase
  Frequency 100-120 Hz nominal
   
OUTPUT Voltage max 120V dc
  Current continuous 3.7 A (see note 1)
  Intermittent 6A for 10 secs.
  Resistance 15 ohms minimum
   
REGULATION +/- 0.5% RMS with 4% engine governing (see note 2)
   
THERMAL DRIFT 0.02% per deg. C change in AVR ambient (note 3)
   
SOFT START RAMP TIME 0.4 - 4 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 5 k ohm 1 watt trimmer (see note 4)
   
UNDER FREQUENCY PROTECTION Set point 95% Hz (see note 5)
  Slope 100-300% down to 30 Hz
  Max. Dwell 20% volts/S recovery
   
UNIT POWER DISSIPATION 18 watts maximum
   
ANALOGUE INPUT Maximum input +/- 5 Vdc (see note 6)
  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. input: 0.33 A
   
CURRENT LIMIT INPUT 10 ohms burden
  Sensitivity range: 0.5 – 1A
   
OVER VOLTAGE DETECTOR INPUT Set point: 300v. Time delay: 1 Sec (fixed)
  CB trip coil volts: 10-30 vdc
  CB trip coil resistance: 20-60 ohms
   
OVER EXCITATION PROTECTION Set point 75 V dc
  Time delay 8-15 seconds (fixed)
   
ENVIRONMENTAL Vibration 20-100 Hz 50mm/sec
  100Hz – 2kHz 3.3g
  Operating temperature -40 to +700C
  Relative Humidity 0-700C 95% (see note 7)
  Storage temperature -55 to +800C
   
NOTES 1. Derate linearly from 3.7A at 50°C to 2.7A at 70°C
  2. The stated voltage regulation may not be maintained in the presence of certain transmitted radio signals. Any change in regulation will fall within the limits in Criteria B of BS.EN.61000-6-2 : 2001.
  3. After 10 minutes.
  4. Applies to Mod status E onwards. Generator de-rate may apply. Check with factory.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.
Specification sheet Download
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