Stamford Avr (Sx440)

We also manufacture:
Stamford: SX460 SX440 AS440 AS480 MX341 MX321 WA440-T
Leroy somer: R230 R250 R448 R449 R450 R438
General: GAVR-8A GAVR-12A GAVR-15A
Basler: EA04C EA05A EA08A EA15A EA350
Marelli: M40FA640A M16FA655A
Marathon: SE350
Charger: ZH-CH28 5A ZH-CH28 10A

1. VR6
VR6 controls the DC exciter field power of conventional, 50 or 60 Hz brushless genera tors. The regulator(VR6) includes frequency compensation with selectable slope, inverse time over-excitation shutdown, solid-state build-up circuitry, single-phase or three-phase voltage sensing, single-phase or three-phase shunt, or permanent magnet power input, and parallel droop compensation, and an accessory input. The accessory input provides compatibility with accessories such as a var/power factor controller.

2. VR6 Technical specification:
Input:
Voltage, rated 120 V 240 V
Voltage, limits 90-140 V 180-280 V
Frequency 50-240 Hz 50-240 Hz
Burden (at rated V) 1440 VA 2400 VA
Output:
Voltage, continuous 65 Vdc 125 Vdc
Voltage, forcing 10 sec. 100 Vdc 200 Vdc
Current, continuous 12 ADC 10 ADC
Current, forcing 10 sec. 25 ADC 20 ADC
Min. Feld resistance 4 Ohms 10 Ohms
Sensing: 100 to 120 V +/-10% with standard 10K Ohm control, 1 phase or 3 phase, 50/60 or 400 Hz;
Paralleling: 1 A or 5 A for 6% droop maximum; 10 VA maximum burden;
Regulation accuracy: +/- 0.5% maximum;
Under frequency protection breakpoints: Adjustable 45 to 65 Hz;
Regulator response: Less than 4 milliseconds;
Thermal stability: Less than 0.5% per 40° Ambi-ent temperature change;
Power dissipation: Less than 50 W at maximum continuous rating.

1. SX440 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator(AVR) and forms part of the excitation system for a brushless alternator, such as Stamford or Stamford technical alternator.
2. SX440 Technical specification:
3. Technical specification
INPUT
Voltage 190-264Vac
Frequency 50-60Hznominal
Phase 1
Wire 2
OUTPUT
Voltage max 90Vdc at 207Vac input
Current continuous 4ADC Intermittent 6A for 10secs
Resistance 15ohmsminimum
REGULATION
+/-1%(seenote1)
THERMALDRIFT
0.04%perdeg. CchangeinAVRambient(note2)
TYPICAL SYSTEM RESPONSE
AVR response 20ms
Filed current to 90% 80ms
Machine Volts to 97% 300ms
EXTERNALVOLTAGEADJUSTMENT
+/-10% with 1 kohm 1 watt trimmer(seenote3)
UNDER FREQUENCY PROTECTION
Set point 95%Hz(seenote4)
Slope 170% down to 30Hz.

UNIT POWER DISSIPATION
12 watts maximum
BUILD UP VOLTAGE
4Volts@AVR terminals
ANALOGUE INPUT
Maximum input +/-5Vdc(seenote5)
Sensitivity 1V for 5% Generator Volts(adjustable)
Input resistance 1kohm
QUADRATURE DROOP INPUT
10ohms burden
Max. Sensitivity: 0.07Afor5%droop0PF
Max. Input: 0.33A
ENVIRONMENTAL
Vibration 20-100Hz 50mm/sec
100Hz 2kHz 3.3G
Operating temperature -40to+70C
Relative Humidity 0-70C 95%(seenote6)
Storage temperature -55 to +80C.