Podcast
Questions and Answers
The shaft of a plugging switch is most often connected _________ to the motor it controls.
The shaft of a plugging switch is most often connected _________ to the motor it controls.
mechanically
Plugging controls provide for the _____ of a motor.
Plugging controls provide for the _____ of a motor.
rapid stop
Another term for a plugging switch is _______.
Another term for a plugging switch is _______.
zero speed switch
Plugging switches are designed to be added to control circuits as _______.
Plugging switches are designed to be added to control circuits as _______.
Most machines in which plugging is done are driven by _______.
Most machines in which plugging is done are driven by _______.
The rotating motion of a motor is transmitted to plugging switch contacts either by a magnetic conduction or by _______.
The rotating motion of a motor is transmitted to plugging switch contacts either by a magnetic conduction or by _______.
A plugging switch acts as a link between the motor and a/an _______.
A plugging switch acts as a link between the motor and a/an _______.
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.
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.
A plugging switch must be driven by what means?
A plugging switch must be driven by what means?
_____________ is not a preferred method of driving a plugging switch.
_____________ is not a preferred method of driving a plugging switch.
What type of coupling is required for a plugging switch?
What type of coupling is required for a plugging switch?
In determining the direction of motor rotation, the electrician will connect motor leads at the ______.
In determining the direction of motor rotation, the electrician will connect motor leads at the ______.
To protect people, machines, and production processes, a __________ is used.
To protect people, machines, and production processes, a __________ is used.
A starter used for a plugging switch will:
A starter used for a plugging switch will:
When a device prevents the application of a counter torque until the motor speed is reduced to an acceptable value, it is known as ______.
When a device prevents the application of a counter torque until the motor speed is reduced to an acceptable value, it is known as ______.
The most accurate method of plug stopping a motor is with a ______.
The most accurate method of plug stopping a motor is with a ______.
The 3 main methods of breaking a motor are ______.
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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