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AVR MX321-2 STAMFORD | Genuine Stamford MX321-2 Automatic Voltage Regulator
NZD $599.00 NZD $499.00 incl. GST
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.
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Sensing Input
• Voltage: 190-264V ac max, 2 or 3 phase
• Frequency: 50-60 Hz nominal
• 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
• Current: 3A/phase
• Frequency: 100-120 Hz nominal
Output
• Voltage: Max 120V dc
• Current: Continuous 3.7A (Derate linearly from 3.7A at 50°C to 2.7A at 70°C), Intermittent 6A for 10 secs.
• Resistance: 15 ohms minimum
• Current: Continuous 3.7A (Derate linearly from 3.7A at 50°C to 2.7A at 70°C), Intermittent 6A for 10 secs.
• Resistance: 15 ohms minimum
Regulation
+/- 0.5% RMS with 4% engine governing (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.)
Thermal Drift
0.02% per deg. C change in AVR ambient (after 10 minutes)
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
• Filed current to 90%: 80 ms
• Machine Volts to 97%: 300 ms
External Voltage Adjustment
+/-10% with 5 k ohm 1 watt trimmer (Applies to Mod status E onwards. Generator de-rate may apply. Check with factory.Factory set, semi-sealed, jumper selectable.)
Under Frequency Protection
• Set point: 95% Hz (Any device connected to the analogue input must be fully floating (galvanically isolated from ground), with an insulation strength of 500V ac.)
• Slope: 100-300% down to 30 Hz
• Max. Dwell: 20% volts/S recovery
• 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 (Non condensing)
• Sensitivity: 1v for 5% Generator Volts (adjustable)
• Input resistance: 1k ohm
• 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
• 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
• 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
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)
• Time delay 8-15 seconds (fixed)
Vibration
• 20-100 Hz: 50mm/sec
• 100Hz – 2kHz: 3.3g
• 100Hz – 2kHz: 3.3g
Environmental
Operating temperature: -40 to +700C
Relative Humidity 0-700C: 95%
Storage temperature: -55 to +800C
Relative Humidity 0-700C: 95%
Storage temperature: -55 to +800C
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