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L1 Motor Controls > Motor Control - Crosswords > Flashcards

Motor Control - Crosswords Flashcards

1
Q

The type of switch that must have the motor shut off prior to pulling the disconnect means.

A

Isolation

* An isolation switch acts as a circuit breaker on your mains electrical supply so that any electrical work (such as an EV charger or solar installation) that is going to take place within a property can be completed safely by a private electrician or anyone doing electrical work on your home.*

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2
Q

A skill that is developed to locate problems in electrical circuitry.

A

Troubleshooting

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3
Q

The combination of overloads and contactor

A

Stator

* The stator is the stationary component of electromagnetic circuits in motors. In different configurations, stators may act as field magnets that interact with the rotor to create motion, or as armatures that work with moving field coils on the rotor. Drives the rotating armature*

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4
Q

A switch that spring returns to its original position

A

Momentary switch

* also known as a “momentary contact switch,” works or turns “on” only for a brief period when it is actuated. It automatically returns to its default “off” position when the actuation is released.*

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5
Q

A device used for making tests on electrical cct.

A

Multimeter (DMM)

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6
Q

A word that deals with heat = overloads

A

Thermal

* Thermal overload relays are economic electromechanical protection devices for the main circuit. In combination with contactors, they provide reliable protection against overloads and phase failures for motors. They allow to set up customized motor starting solutions according to individual needs.*

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7
Q

Current taken by a motor in a stalled condition.

A

Locked rotor

* A locked rotor condition occurs when the motor’s rotor (the rotating part) is prevented from turning, usually due to a mechanical obstruction or excessive load. In basic terms, it’s like trying to push a stationary boulder – the motor struggles to start, drawing a surge of current.*

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8
Q

The type of disconnect that has overcurrent and overload protection as well as a contactor.

A

Combination

***What is a combination starter disconnect?

Simply put, a combination starter is a motor starter that has the three following elements contained in an enclosure or some kind of protective case: A motor disconnect, a motor controller, motor branch circuit protection, and motor overload protection.***

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9
Q

The type of motor starter that has toggle switch to open or close the cct.

A

Manual

*** What is the difference between a manual motor starter and a switch?

A manual switch is a motor controller whose contact mechanism is operated by a mechanical linkage from a toggle handle or rotary handle. A manual starter is basically an “ON-OFF” switch with overload protection.***

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10
Q

How many wire control is a low-voltage release circuit?

A

2

*** 2-wire control

The 2-wire control circuit provides what is known as “low-voltage release.” In the event of a power failure, the magnetic motor starter will drop out.***

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11
Q

How to protect a motor from undervoltage?

A

To protect motors and equipment, use a three-phase monitor relay, also known as a phase failure relay, as a cost-effective solution to prevent costly damage from undervoltage.

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12
Q

What is the purpose of a manual start switch?

A

Manual Motor Starters are electromechanical protection devices for switching electrical motors ON/OFF manually. They enable you cost- and space-saving fuseless protection against thermal overload, short circuit, and phase failures.

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13
Q

What is the difference between a manual motor starter and a switch?

A

A manual switch is a motor controller whose contact mechanism is operated by a mechanical linkage from a toggle handle or rotary handle. A manual starter is basically an “ON-OFF” switch with overload protection.

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14
Q

What does it mean when the manual motor starter toggle switch lever is in a center position?

A

tripped

The handle moves to the middle or tripped position, and after a cooling period, the toggle switch can be reset by pushing the lever into the fully off position and then switching it on again.

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15
Q

What is a motor start switch?

A

A motor starter is an electrical device that is used to start & stop a motor safely. Like a relay, the motor starter switches the power ON/OFF, but unlike a relay, it also provides thermal overcurrent protection. The main function of a motor starter is: To safely start or stop a motor.

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16
Q

What is the difference between magnetic starter and manual starter?

A

Magnetic motor starters rely on electromagnets to close and hold contactors rather than the use of mechanical latching of on/off switches as used in manual starters. They are used in across-the-line applications and as reduced voltage starters for single- and three-phase motors.

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17
Q

What are the three types of starter motors?

A

Types of Motor Starters
- Manual: A manual starter is the most basic starter. …

  • Magnetic: This starter style utilizes a contactor or large relay to turn the motor on or off.
  • Reversing: A reversing style starter uses two contactors in parallel to change the phases so that the motor will run in reverse.
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18
Q

An overcurrent protective device

A

Fuse

19
Q

A current sensitive adjustable resistor

A

Rheostat

20
Q

The type of drawing that shows the component layout

A

Schematic drawing

uses symbols to identify components and interconnecting lines to display the electrical continuity of a circuit.

21
Q

The rate of doing work

A

Watt

22
Q

Also known as overload relay

A

Relay switch

An overload relay, also referred to as a relay switch, is a device that opens the circuit in the event of an electrical, thermal or power overload.

23
Q

Another name for inching

A

Jogging

Jogging refers to repeated starting and stopping of a motor in short bursts to perform a particular movement such as moving a crane to a particular location. Jogging should not be done more than 5 times in a minute.

24
Q

The hand that must be used when pulling or putting in a disconnect switch

A

Left

25
Q

The cct used to manage the power cct

A

Control

26
Q

The process involved in repairing on overload condition

A

Reset

Before a motor overload can be reset, the cause of the overload must be identified and corrected. This may involve inspecting the motor and its components for any damage or wear, checking for proper lubrication, and ensuring that the motor is not being operated beyond its rated capacity.

27
Q

Made up of electromagnet and a set of contacts

A

Electromechanical Relays (EMRs) are commonly used devices in electrical systems. They work based on the principle of electromagnetism. Let’s dive into the details of EMRs. An EMR consists of two main parts: an electromagnet and a set of mechanical contacts.

28
Q

The type of diagram showing the relationship of sub units

A

Block

29
Q

The smallest part of a cct. Ie resistor, transistor etc.

A

Component

30
Q

A type of magnetic with a front pivot

A

Clapper

When the clapper strikes the inside of a bell, it makes the bell ring. If you need the bell to be silent, you have to muffle the clapper to keep it from striking the inside of the bell and making a sound.

31
Q

A normally closed (NC) type button

A

Stop push button

32
Q

A device that when pressed can either start or stop a cct

A

A push button

33
Q

A particular method for checking fuses

A

Crisscross

34
Q

The material that is used in the melting type thermal overload

A

Solder

35
Q

The noise that a broken shading coil makes

A

Chatter

If a magnetic contactor is making an unnatural “chattering” sound, it may be caused by a loose or faulty shading coil. Shading coils are simple closed loops of conductive material that, when exposed to the changing magnetic field of an AC circuit, creates its own magnetic field with a slight delay in period.

36
Q

Contact that assist the main cct contacts

A

Auxiliary

Auxiliary contact is the contact in the auxiliary circuit that is operated mechanically. It is physically linked to the main contacts and activate at the same time. It does not carry so much current. Auxiliary contact is also referred to as supplementary contact or control contact.

37
Q

Either mechanical or electrical

A

Interlock

Mechanical Interlocks
Forward / reverse starters must never close their power contacts simultaneously. The best way to provide this is through electrical interlocks, which prevent the one coil from being energized if the other is engaged.

What is mechanical and electrical interlock?

The mechanical interlock between the contactors of the handle lock is to make the two contactors used for interlocking cannot operate at the same time by contacting the internal structural mechanism, while the electrical interlocking is to form a chain through the electrical connection through the auxiliary electric

38
Q

A place where keys are kept when a lot of tradespeople need to lockout

A

Lockbox

39
Q

A coil that quickly extinguishes the arc caused by opening a switch under load

A

Blowout

A blowout coil is a safety device used to suppress electric arcs created in the air gap between contacts when switching high currents. Magnetic blowout coils overcome this condition by providing a magnetic field that pushes the arc away from the contact field.

40
Q

Another name for holding contact

A

Seal-in

Also known as a “maintaining” contact, these are the normally open contacts of a magnetic starter that are connected in parallel with the start button in a three-wire control circuit.

41
Q

How multiple stop buttons are installed in a control cct

A

Series

42
Q

A switch with 2,3,4 or more position

A

Selector

Refer to link of pilot devices https://opentextbc.ca/basicmotorcontrol/chapter/switches-and-pushbuttons/

43
Q

The type of switch that is used for speed control as well as forward/reverse direction

A

Drum - Drum switches have handles or levers that operators turn to start/stop motors and reverse their direction. These switches control motors in applications like machine tools, conveyors, and doors.

If a motor is to be driven in two directions, then it will require a Forward / Reverse motor starter, which has two three-pole horsepower-rated contactors rather than just one as in the conventional starter. Each of the two different motor starters powers the motor with a different phase rotation.

44
Q

The rating that the disconnecting mean and the power contacts must be

A

Horsepower

The contacts are the current-carrying part of the contactor. This includes power contacts, auxiliary contacts, and contact springs. Contact material is chosen for high electrical conductivity, mechanical strength, and stability under arcing and oxidation.

L1 Motor Controls (6 decks)

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