The AS480 is a half wave phase controlled AVR which forms part of the excitation system of the brushless generator. The design employs Surface Mount Technology (SMT), custom mouldings and heatsinks to produce a compact AVR assembly. The AVR also incorporates an interface to the optional Excitation Boost System (EBS) for use where short-circuit current maintenance is required.
Technical parameters
SENSING and POWER INPUT Voltage 100-264 V ac 1 phase Frequency 50-60 Hz nominal
OUTPUT Voltage 82 V d.c. @ 200 Va.c power input. Voltage 45 V d.c. @ 110 Va.c power input. Current continuous 5A (see note 1). transient 7.5A for 10 secs. Resistance 15 ohms min
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 20ms Field current to 90% 80 ms Machine Volts to 97% 300ms
EXTERNAL VOLTAGE ADJUSTMENT +/-10% with 1 k ohm 1 watt trimmer (see note 4) Increasing resistance lowers voltage. Fixed 15kOhm resistor enables 110V sensing
UNDER FREQUENCY PROTECTION Set point 94 -98% Hz (see note 5)
UNIT POWER DISSIPATION 12 watts maximum
BUILD UP VOLTAGE 4 Volts @ AVR terminals
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 67 Vdc +/-3% (fixed) Time delay 10-15 seconds (fixed)
ENVIRONMENTAL Vibration 20-100 Hz 50mm/sec 100Hz – 2kHz 3.3g Operating temperature -40 to +70C (note 6) Relative Humidity 0-70C 95% (note 7) Storage temperature -55 to +80C