Stamford Automatic Voltage Regulator - AVR MX321
- Stamford
- UK
- 7 days
- 1000 sets
The MX321 analogue, 3-phase sensing, permanent magnet generator (PMG) powered automatic voltage regulator (AVR) provides isolation from the effects of non-linear loads, improved motor starting performance and sustained short circuit current.
The MX321 AVR is provided as standard for the STAMFORD S6 and HC6 alternators and can also be provided as an option across the STAMFORD range.
The MX321 analogue, 3-phase sensing, permanent magnet generator (PMG) powered automatic voltage regulator (AVR) provides isolation from the effects of non-linear loads, improved motor starting performance and sustained short circuit current.
The MX321 AVR is provided as standard for the STAMFORD S6 and HC6 alternators and can also be provided as an option across the STAMFORD range.
Technical specification:
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, Intermittent 6A for 10 secs
Resistance: 15 ohms minimum
REGULATION
+/- 0.5% RMS with 4% engine governing
THERMAL DRIFT
0.02% per deg. C change in AVR ambient
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
UNDER FREQUENCY PROTECTION
Set point: 94-98% Hz
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
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)
Time delay 8-15 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) 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;
5) Factory set, semi-sealed, jumper selectable;
6) Any device connected to the analogue input must be fully floating (galvanically isolated from ground), with an insulation strength of 500V ac;
7) Non condensing.
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