Genuine Stamford AVR Mx321 Made in UK

Genuine Stamford AVR Mx321 Made in UK
 

Product Description:

 

MX321 is a three phase sensed Automatic Voltage Regulator and forms part of the excitation system for a brushless generator.Excitation power is derived from a three phased permanent magnet generator(PMG),to isolate the AVR control circuits from the effects of nonlinear loads and to reguce radio frequency interence on the generator terminals.Sustained generator short circuit current is another feature of the PMG system  

 

 

Product details presentation:

 

 

 

TECHNICAL SPECIFICATION:

SENSING INPUT
Voltage 170-250 V ac max
Frequency 50-60 Hz nominal
Phase 1 or 3
Wire 2 or 3

POWER INPUT (PMG)
Voltage 170-220 V ac
Current 3 A/phase
Frequency 100-120 Hz nominal
Phase 3 Wire 3

OUTPUT
Voltage max 120 V dc
Current continuous 3.7 A (See note 3)
Transient 6 A for 10 seconds
Field Resistance 15 W minimum
REGULATION (See Note 1) +/- 0.5% RMS*
THERMAL DRIFT
(after 10 min)
0.5% for 40°C change in AVR ambient
SOFT START RAMP TIME
0.4 - 4 seconds
TYPICAL SYSTEM RESPONSE
Field current to 90% 80ms
Machine Volts to 97% 300ms
EXTERNAL VOLTAGE ADJUSTMENT
+/- 6% with 4.7 K W trimmer
UNDER FREQUENCY PROTECTION
Set Point (see note 2) 95% Hz
Slope 100-300% down to 30 Hz
Dwell (Recovery) 0.5-2.0 seconds
UNIT POWER DISSIPATION
18 watts maximum
ACCESSORY INPUT
+/- 1 V = +/- 5% change in output volts
QUADRATURE DROOP
Maximum sensitivity (10 W Burden)
0.22 A for 5% droop @ 0p.f.
CURRENT LIMIT
sensitivity range (10 W Burden) 0.45 A - 1 A
OVER VOLTAGE PROTECTION
Set Point 300 V
Time Delay (fixed) 8-15 seconds
Circuit breaker trip coil voltage 40-60 v dc
Circuit breaker trip coil resistance 50-100 ohms
OVER EXCITATION PROTECTION
Set Point 75 V dc
Time Delay (fixed) 8-15 seconds
ENVIRONMENTAL
Vibration 20 - 100 Hz 50mmc100 - 2 kHz 3.3g
Relative Humidity 0 - 60°C 95%
Operating Temperature -40 to+70°C
Storage Temperature -55 to +80°C