Questions and Answers
The shaft of a plugging switch is most often connected _________ to the motor it controls.
mechanically
Plugging controls provide for the _____ of a motor.
rapid stop
Another term for a plugging switch is _______.
zero speed switch
Plugging switches are designed to be added to control circuits as _______.
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Most machines in which plugging is done are driven by _______.
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The rotating motion of a motor is transmitted to plugging switch contacts either by a magnetic conduction or by _______.
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A plugging switch acts as a link between the motor and a/an _______.
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In a plugging device to oppose the torque and ensure that the contacts opened and closed at the proper time, regardless of motor speed a ______________ is used.
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A plugging switch must be driven by what means?
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_____________ is not a preferred method of driving a plugging switch.
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What type of coupling is required for a plugging switch?
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In determining the direction of motor rotation, the electrician will connect motor leads at the ______.
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To protect people, machines, and production processes, a __________ is used.
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A starter used for a plugging switch will:
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When a device prevents the application of a counter torque until the motor speed is reduced to an acceptable value, it is known as ______.
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The most accurate method of plug stopping a motor is with a ______.
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The 3 main methods of breaking a motor are ______.
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Study Notes
Plugging Switches and Controls
- The shaft of a plugging switch typically connects mechanically to its corresponding motor.
- Plugging controls enable a motor to achieve a rapid stop effectively.
- A plugging switch is also referred to as a zero speed switch.
Functionality and Design
- Plugging switches function as pilot devices within control circuits.
- Most applications of plugging utilize squirrel cage motors for their drive.
- The motion from the motor is relayed to the plugging switch contacts through either magnetic conduction or a centrifugal mechanism.
Connection and Operation
- A plugging switch links the motor to a reversing starter for operational control.
- Adjustable contact springs are utilized in plugging devices to counteract torque, ensuring timely opening and closing of contacts, regardless of motor speed.
- Plugging switches must be driven by positive means to function correctly.
Preferred Driving Methods
- Belt drive is not a preferred method for driving a plugging switch.
- A direct flexible coupling is necessary for effective connection to a plugging switch.
Electrical Connections and Safety
- In determining motor rotation direction, electricians connect motor leads at the motor/starter interface.
- To safeguard individuals, equipment, and production workflows, a lockout relay is essential.
Starter Functions and Anti-Plugging
- A starter designed for plugging switches can interchange leads for three-phase motors, reverse the armature for DC motors, and reverse windings for single-phase motors.
- Anti-plugging refers to mechanisms that delay counter torque application until the motor speed falls to an acceptable level.
Stopping Methods
- The most precise method for plug stopping a motor involves using a zero speed switch.
- The three primary methods for breaking a motor's motion include mechanical breaking, dynamic braking, and plugging techniques.
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Description
Test your knowledge on plugging switches and their functions within control circuits. This quiz covers key terminology and definitions related to motor control systems. Perfect for electrical engineering students or professionals looking to refresh their understanding.
