Voltage fluctuation is all too common and does a great amount of damage to sensitive electronic equipment. To avoid the expenses involved in replacing machinery and overtime charges to catch up on production it makes good sense to use an automatic voltage regulator. These autonomous devices catch and correct the voltage before it can cause problems. The automatic voltage regulator works by measuring the output voltage against a set point. Once a difference has been detected to sends a signal to adjust the excitation of the generator. As the excitation current in the field winding increases the terminal voltage will increase. This solid state unit is far more efficient than the old electromechanical devices as it automatically adjusts the voltage where necessary. Where multiple generators are used the AVR system will have circuits to ensure that all generators operate at the same power factor.
Specifications of the EA321 Automatic Voltage Regulator
The sensing input has a voltage of 190 to 264 Vac maximum on 3 phase with an option of 50 or 60 Hertz. The power input is 170 to 220 Vac maximum at 3 phase with 3 wires with a current of 3 Amps per phase. The excitation voltage is a maximum of 120 Vdc at a power input of 220 Vac with a continuous current of 4 Amps and an intermittent current of 7 Amps for 60 seconds. The resistance is a minimum of 15 Ohms. The static power dissipation is a maximum of 18 Watts. Quadrature droop input burden is 10 Ohms with a maximum input of 0.33 Amps. It has an operation temperature range of between -40 Celsius to 70 degrees Celsius.
Characteristics of the EA321 Automatic Voltage Regulator
This unit has been designed for use with a permanent magnet generator. A frequency measuring circuit continually monitors the shaft speed of the generator and provides under speed protection. Provision is made for the connection of a remote voltage trimmer to allow the user fine control of the generator’s output. An analogue input allows connection to a controller or other external device. The AVR can be run in parallel with other generators.