Product description： 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 non-linear loads and to reduce radio frequency interference on the generator terminals. Sustained generator short circuit current is another feature of the PMG system.
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