Introduction: 
AS440 is a half wave phase controlled thyristor type AVR and forms part of the excitation system for a brushless generator. The design employs Surface Mount Technology (SMT) for high integration of features in a small footprint AVR. 
Positive voltage build up from residual levels is ensured by the use of efficient semiconductors in the power circuitry of the AVR. The power and voltage sensing circuits have separate terminals, allowing the excitation power to be derived directly from the stator winding for basic applications or from an auxiliary winding if sustained short circuit performance is required. 
The AVR is linked with the main stator windings and the exciter field windings to provide closed loop control of the output voltage with load regulation of +/- 1.0%. 
The AVR voltage sensing terminals continuously sample the output windings for voltage control purposes. In response to this sample voltage, the AVR controls the power fed to the exciter field, and hence the main field, to maintain the machine output voltage within the specified limits, compensating for load, speed, temperature and power factor, of the generator. 
Over excitation conditions are limited to a safe period by a protection circuit within the AVR. 
Provision is made for the connection of a remote voltage trimmer, allowing the user fine control of the generator's output. 
An analogue input is provided allowing connection to a Newage Power Factor controller or other external devices with compatible output. 
The AVR has the facility for droop CT connection, to allow parallel running with other similarly equipped generators. 

Specification: 
SENSING INPUT 
Voltage Jumper selectable 
100-130 Vac 1 phase or 
190-264 Vac 1 phase 
Frequency 50-60 Hz nominal 
POWER INPUT 
Voltage 100-264 V ac 1 phase 
Frequency 50-60 Hz nominal 
OUTPUT 
Voltage 82 V d. C. @ 200 V a. C. 
Current continuous 4A (see note 1) . 
Transient 7.5A for 10 secs. 
Resistance 15 ohms min  
(10 ohms min when input volts is less than 175 ac) 
REGULATION 
+/- 1.0% (see note 2) 
THERMAL DRIFT 
0.03% per deg. C change in AVR ambient (see note 3) 
TYPICAL SYSTEM RESPONSE 
AVR response: 20 ms 
Filed current to 90%: 80 ms 
Machine Volts to 97%: 300 ms 
EXTERNAL VOLTAGE ADJUSTMENT 
+/-10% with 1 k ohm 1 watt trimmer (see note 4) 
Increasing resistance lowers voltage. 
UNDER FREQUENCY PROTECTION 
Set point: 94 -98% Hz (see note 5) 
UNIT POWER DISSIPATION 
12 watts maximum 
BUILD UP VOLTAGE 
4 Volts @ AVR terminals 
ANALOGUE INPUT 
Maximum input: +/- 5 Vdc (see note 6) 
Sensitivity: 1V for 5% Generator Volts (adjustable) 
Input resistance 1k ohm 
QUADRATURE DROOP INPUT 
10 ohms burden 
Max. Sensitivity: 0.07 A for 5% droop 0PF 
Max. Input: 0.33 A 
OVER EXCITATION PROTECTION 
Set point 75 V dc 
Time delay 10-15 seconds (fixed) 
ENVIRONMENTAL 
Vibration: 20-100 Hz 50mm/sec 
100Hz -2kHz 3.3g 
Operating temperature: -40 to +70º C (note 7) 
Relative Humidity: 0-70º C 95% (note 8) 
Storage temperature: -55 to +80º C