This wiring diagram shows how to set up a DOC (Digital Overload Controller) unit for a panel board starter with two modes: automatic and manual. Here’s a detailed explanation of each component and connection:
Components:
1. DOC Unit: Controls the motor and has settings for different operational modes.
2. Manual/Auto Switch: Allows switching between automatic and manual control.
3. Main Contactor: Primary contactor used for motor control.
4. Secondary Contactor: Auxiliary contactor for additional control in certain configurations.
5. Relay: Acts as an intermediary control element, often for safety or switching purposes.
6. Line Input and Motor Output Terminals: Provide power to the motor and connect to the power source.
Connections:
1. DOC Unit to Manual/Auto Switch:
NC (Normally Closed) and NO (Normally Open): Wires from these contacts on the DOC unit connect to the manual/auto switch, allowing the user to toggle modes.
2. DOC Unit to Main and Secondary Contactors:
The DOC unit has multiple control wires (yellow, black, orange, etc.) that connect to both the main and secondary contactors.
Yellow Wires: Likely provide control signals to the contactors for switching.
Black and Orange Wires: Used for further signal or control connection between the DOC unit and the contactors.
3. Power Lines (Line Input Terminal):
The R, Y, B, and N terminals on the line input section represent the threephase power supply and neutral.
Red, Yellow, and Blue Wires: Connect each phase (R, Y, B) from the line input to both the main and secondary contactors.
4. Motor Output Terminal:
The output terminals labeled R, Y, B connect to the motor, allowing it to receive power from the contactors.
Red, Yellow, and Blue Wires: These wires provide the output power to the motor based on the contactor states.
5. Relay Connections:
The relay is connected with blue wires to various points on the contactors and DOC unit, possibly for auxiliary functions like overload protection or safety interlocks.
Functionality:
Automatic Mode: When the manual/auto switch is in the "Auto" position, the DOC unit automatically controls the motor based on programmed settings or conditions.
Manual Mode: When switched to "Manual," the DOC unit allows the operator to manually control the motor, bypassing automatic functions.
This setup allows for flexible control of the motor, providing options for automated or manual operation, typically used in industrial or heavyduty motor control applications.
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Tags:
Mechanical