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Sequential Control Schematic Ciruit Diagram

Sequential Control Systems

Sequential control systems operate by processing individual steps in a predefined order. Progression from one step to the next is contingent upon specific conditions being met, ensuring a systematic sequence of actions.

Application of Sequential Controls

These controls find application in scenarios where precise and continuous remote control of mechanical installations, such as rotating antennas or valves, is necessary. The diagram depicts a sequential control system with a remarkable setting accuracy of 2.5%, achieved using a minimal number of components.

Sequential Control Schematic Ciruit Diagram 1

Controlling Motor Rotation with Bridge Rectifier and Potentiometers

In this configuration, the control motor is connected in series with a bridge rectifier across the secondary mains transformer Tr2. It is crucial that the transistor’s rating matches that of the motor. Additionally, two other main transformers, both 12-volt light-duty types, are utilized. These transformers provide a small alternating voltage accessible via P1 and P2.

Utilizing Potentiometers for Motor Control

The wiper of P1 is linked to the gate of T1 through a resistive network (R3-R5), while the wiper of P2 connects to the source of T1. The source-gate junction of the transistor acts as a null-point detector. When the circuit is balanced, the potential difference between the two wipers equals zero, causing T1 to turn off. Consequently, no current can pass through the motor because the current loop in the rectifier bridge breaks during each half cycle. Adjusting one of the potentiometers disrupts the balance, leading to T1 being activated either during the positive or negative half cycles, depending on which potentiometer was adjusted.

Enabling Bidirectional Motor Rotation

During imbalance, current flows through the motor, D4, T1, and D1, or through the motor, D3, T1, and D2. This arrangement allows the motor to rotate in either direction. If mechanical input is applied to P2, P1 can be employed for remote motor control.

Considerations for Different Motor Types

It’s essential to note that the depicted circuit is designed for 12 V motors. If alternative motors are used, it’s crucial to recognize that they operate on half-wave rectified voltage. Consequently, the transformer must be rated at 1.52 times the motor voltage to ensure proper functionality.


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