Muti-turn Model: AVA.
Quarter-turn Model: AVAT.
Country of Origin: China.
Non-intrusive Design
The Greatork AVA/AVAT range actuators take the non-intrusive design. The site setting operation can be accomplished by using an infrared setting tool without removing the electric cover. The design for local operation discards the traditional moving shafts penetrating the control enclosure and takes the hall magnetic sensor technology to control the actuator.
Torque Measurement
Greatork adopts its patented torque measurement system to ensure the overload protection of actuators and indicate the torque variation by LCD.
High-definition LCD
Greatork actuators incorporate a unique high-definition liquid crystal display. Large display window with backlight enables users to see valve position, torque and functional status at a long distance.
Automatic Phase Correction & Adjustment
With phase sequence discrimination function for power supply, Greatork actuator will rotate correctly, regardless how the three phase sequence is. It avoids the damaging of valve and actuator result from wrong wiring.
Over Torque Protection
When load torque exceeds actuator setting torque, the actuator will stop and alarm, the indication contact will action.
Instantaneous Reversal Protection
When actuators are rotating in one direction, such as opening, if the closing signal is commanded, the internal control circuit will stop for a while before executing closing. This technology decreases the over-current damage to the motor, prolongs the contactor's service life and prevents the mechanical driving devices, such as valve stem, gearboxes damaged by shock.
Phase Lost Protection
To prevent overheating of three-phase motor when losing phase, the phase lost protection circuit will monitor the three-phase power continuously. If one or more phases are lost, the actuator will block the control from control circuit to motor and alarm.
Motor Overheating Protection
Greatork actuator motors are designed with F class insulation, which can work in extreme environments. The thermal switches embedded in the motor windings of actuators will disconnect the relevant contacts, stop actuators and display alarm signals once the winding temperature is over presetting (132℃). Motor overheating protection can be shielded via setting program.
Remote Indication of Valve Position
Greatork actuator's current transmitter can convert the present valve position into 4-20mA current output signal. The smallest corresponding signals can be chosen for full open or full close. At rated voltage, the maximum external impedance is 500 Ω and the linearity of the whole stroke is less than 1%.
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