Analog Feedback Mechanical Load Control

Western States - Analog Feedback Mechanical Load ControlThe Analog Feedback Mechanical Load Control is a fully enclosed, solid state device to replace the Servo Loading Control. The electronics for the Analog Feedback Mechanical Load Control assembly are located on the unit for easy access and simplified installation.

The Analog Feedback Mechanical Load Control uses a paddle assembly to sense the load in the basket and generate a signal that varies with the basket load. A positioner mounted on the loading gate shaft generates a signal that varies with the amount of gate opening. The two signals are compared by the centrifugal PLC to control the loading of the basket. The primary difference between the Servo Loading system and the Analog Feedback Mechanical Load Control is the ability of the PLC to utilize the analog signals obtained during loading to better control the loading gate, maintain a constant feed rate, and gain precise control of the requested fill thickness with less operator intervention.

The Analog Feedback Mechanical Load Control mounts to the centrifugal in the same position as the paddle for the Servo Load Control; the gate positioner replaces the Servo Box on the gate shaft. Slight modification of both the valve lifter base and gate shaft is required.

The Analog Feedback Mechanical Load Control can be integrated into most Allen-Bradley PLC systems if an electronic operator interface (graphic terminal) is present. For centrifugal installations with other types of controls, an optional electronics package is required. The optional electronics package includes a dedicated PLC with logic for controlling the loading and an Allen-Bradley Panel View component C300 Operator Interface Terminal to allow the operator to set the fill thickness and maximum gate opening.

The complete package to convert a centrifugal using a sliding wedge or roller wedge gate and Servo Loading to Analog Feedback Mechanical Load Control consists of:

  • Analog Feedback Mechanical Load Sensor
  • Gate encoder

Optional items that may be required are:

  • Electronics package
  • Replacement valve lifter assembly
  • Gate solenoid valves

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