SKD series electric actuator is especially designed for the cement industry. This product is the terminal performing unit based on the SD electric actuator adopting the advanced automatic modulating technology from BERNARD Company of France. It incepts 4~20 mA analogue signal from the modulator or the computer, outputs the torque the thrust and automatically operates the actuator to perform the automatic modulating.

Main technical specifications and characteristics

1. Voltage of the power supply: 380V50HZ

Controlling voltage: 220 V50HZ

2. Input controlling signal: 4~20 mA DC Ri=250Ω

3. Output valve position signal: 4~20 mA DC RLmax=300Ω

4. Output torque: refer to sheet 1(or sheet 2 or sheet 3)

5. The actuator and controlling box are assembled separately in order to adapt the effect of the over-high environment temperature.

6. Requirement of control mode: automatically modulate to stop at the terminal 34° and alarm. If it is necessary to modulate for the ending position, it can be startup forcefully to the ending position to guarantee the security of the equipment.

7. environment temperature:10°C~55°C

Humidity: ≤85% no corrosive characteristic exist in the ambient air

8. Protection class: accordance with IEC145 IP65

Advantages:

Cut-off signal protection

The actuator stop at the original, all-on or all-off position which is instructed by users as the signal is interrupted by accident or the input signal is less than 3mA (called the cut-off signal) in order to guarantee the whole system’s safe and stable. It also possesses the output connection point for alarm.

Over-torque of two- way protecting function

When the torque exceeds the setting scope, the torque switches inside the actuator and outputs a signal to the controlling circuit for stopping the motor to protect the valve, the driving parts and the motor. After the mechanical over-torque fault is relieved, shutting down the power supply or input an instantaneously reversed signal, the actuator will come back to turn normally.

Auto switch function

The actuator can implement three kinds of switch function – “Distant- automatic / distant -manual /local”. It can also operate electrically and manually on the spot.

The pros and cons of switch function

The control panel program has the pros and cons of switch function that satisfied different situations on-the-spot.

Dynamic braking

The control panel program of modulating model electric actuator has the dynamic braking function that can prevent motor’s inertia movement and ensure the stability and reliability of the controlling system.

Servo-motor with double protection and high-efficiency

All the motor has the thermal and open-phase protecting function. When there is an unexpected failure, it will shut off the power supply effectively so as to protect the motor. It serves as a good servo characteristic and it will not overheat after frequent movements.

Stronger anti-interference function

With the imported main chip of control panel and stable performance, the actuator has the stronger anti-interference capability. The input and output signal adopt the shielded wire.