AVR AS440 Automatic Voltage Regulator Module Fits Generator Sets
Introduction:
The AS440 is a half-wave phase-controlled thyristor type AVR and forms part of the excitation system for a brushless generator. The design uses Surface Mount Technology (SMT) for high integration of functions in a small area AVR.
Positive voltage build-up from residual levels is ensured by the use of efficient semiconductors in the AVR power circuits. 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 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 supplied to the exciter field, and hence the main field, to maintain the machine output voltage within specified limits and to compensate for generator load, speed, temperature and power factor.
Over-excitation conditions are limited to a safe period by a protection circuit in the AVR.
There is a possibility to connect a remote voltage trimmer, which allows the user to control the generator output.
An analog input is provided which allows connection to a Newage Power Factor controller or other external devices with compatible output.
The AVR has the option of a hanging CT connection, to allow parallel operation with other similarly equipped generators.
Specification:
SENSOR 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
PRODUCTION
Voltage 82 V d. C. @ 200 V a. C.
Current continuous 4A (see note 1).
Transient 7.5A for 10 seconds.
Resistance 15 ohms min.
(10 ohms min when input voltage is less than 175 ac)
REGULATION
+/- 1.0% (see note 2)
THERMAL OPERATION
0.03% per deg. C change in AVR environment (see note 3)
TYPICAL SYSTEM RESPONSE
AVR response: 20 ms
Filed current to 90%: 80 ms
Machine voltage to 97%: 300 ms
EXTERNAL VOLTAGE ADJUSTMENT
+/-10% with 1k ohm 1 watt trimmer (see note 4)
Increased resistance lowers the voltage.
UNDER FREQUENCY PROTECTION
Setpoint: 94 -98% Hz (see note 5)
UNIT POWER SUPPLY
Maximum 12 watts
BUILD UP TENSION
4 Volts @ AVR socket
ANALOG INPUT
Maximum input: +/- 5 Vdc (see note 6)
Sensitivity: 1V for 5% generator voltage (adjustable)
Input resistance 1k ohm
QUADRATURE DROOP INPUT
10 ohm burden
Max. Sensitivity: 0.07 A for 5% drop 0PF
Max. Input: 0.33 A
OVER EXCITATION PROTECTION
Setpoint 75 V dc
Time delay 10-15 seconds (fixed)
ENVIRONMENT
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
