Automatic Voltage Regulator AVR MX321
is the replacemet for stamford AVR MX341
The MX321 has all the features of the MX341, additionally achieving voltage regulation in the order of 0.5 %. There is also the facility for 3-phase RMS sensing, built in overvoltage protection and optional short circuit current level adjustment.
The combination of PMG providing an isolated power source and the MX321's RMS sensing makes an ideal arrangement for supplying the non-linear loads associated with UPS systems.
Technical specification
SENSING INPUT
Voltage 190-264V ac max, 2 or 3 phase
Frequency 50-60HZ nominal
POWER INPUT
Voltage 170-220 V ac max, 3 phase,3 wire
CURRENT: 3A/phase
Frequency 100-120HZ nominal
OUTPUT
Voltage max 120V dc
Current continuous 3.7A dc
Intermittent 6A for 10 secs
Resistance 15 ohms minimum
REGULATION
+/-0.5% RMS with 4% engine goverming
THERMAL DRIFT
0.02% per deg.C change in AVR ambient
TYPICAL SYSTEM RESPONSE
AVR respone 10ms
Filed current to 90% 80ms
Machine Volts to 97% 300ms
EXTERNAL VOLTAGE ADJUSTMENT
+/-10% with 5k ohm 1 watt trimmer
UNDER FREQUENCY PROTECTION
Set point 95%HZ
Slope 100% -300% down to 30HZ
Max dwell 20% volts/S recoverey
UNIT POWER DISSIPATION
18 watts maximum
ANALOGUE INPUT
Maximum input +/-5V dc
Sensitivity 1V for 5% Generator Volts(adjustable)
Input resistance 1k ohm
QUADRATURE DROOP INPUT
10 ohms burden
Max.sensitivity:0.22A for 5% droop OPF
Max.input:0.33A
CURRENT LIMIT INPUT
10 ohms burden
Sensitivity range:0.5-1A
OVER VOLTAGE DETECTOR INPUT:
Set point:300V,time delay:1 sec
CB trip coil volts:10-30 vdc
CB trip coil RESISTANCE:20-60 ohms
OVER EXCITATION PROTECTION:
Set point:75vdc
Time relay:8-15 sec
Environmental
Vibration 20-100HZ 50mm/sec
100Hz 2kHz 3.3g
Operating temperature -40 to +70 C
Relative Humidity 0-70C 95%
Storage temperature -55 to +80 C