Newage Stamford MX321

MX321 is a three phase sensed Automatic Voltage Regulator and forms part of the excitation system for a\r\nbrush-less generator. Excitation power is derived from a three-phase permanent magnet generator (PMG), to\r\nisolate the AVR control circuits from the effects of nonlinear\r\nloads and to reduce radio frequency interference on\r\nthe generator terminals. Sustained generator short circuit\r\ncurrent is another feature of the PMG system.', '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.

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