Defenitions Flashcards
What type of control system requires a human operator?
Manual
What type of control is characterized by using a push button, pressure switch or other sensing device to operate a magnetic contactor or starter? The operator still needs to initiate the action such as starting or stopping, but the motor is connected to the line directly by the starter, being controlled by our input.
Semi-auto
What type control system does not require an operator?
Automatic
What are some types of motor control systems we use every day?
Garage door opener
Microwave
Dishwasher
Bathroom fan
Light switch
What are the three types of control systems?
Manual
Semi automatic
Automatic
What are five factor factors that will influence the design of a control system when we are talking about installing motors and control equipment?
Power source
Motor connections
Motor type
Controller type
Electrical code
What are conductive parts which co-act with another to either complete or interrupt Circuits?
Contacts
What kind of contact is sized to carry the full load current to the motor or load?
Pole contacts
What kind of contacts move and are usually spring loaded?
Moveable contacts
What kind of context do not move?
Stationary contacts
What Kind of contact maintains power to the contactor after the start button is released?
Holding contacts
What type of contact can be N.O. And/or N.C. And can change state when the coil is energized?
Auxiliary contacts
Define button interlocking
The electrical prevention of two circuit actions from taking place simultaneously.
The activation of a button will open the circuit to one coil and close the circuit path to the other coil.
Define mechanical interlocking
Physical prevention of two actions from taking place simultaneously. One Action Taking place prohibits the other action from taking place.
Define electrical auxiliary interlocking
The electrical prevention of two actions were taking place simultaneously.
The difference between a motor starter and a contactor is the addition of a___________.
Overload relay
Are you allowed to use to push button and electrical auxiliary interlocking in the same circuit?
Yes
Abbreviation for the term “single pole, double throw”
SPDT
To reverse the rotation of a three phase motor, interchange ________ motor leads
Any two
The CEC dictates that the three phases shall be coloured as follows:
L1 _______
L2_______
L3_______
Red
Black
Blue
To reverse the rotation for a single phase motor, you must interchange either the_____________ or the ___________, but not both.
Starting windings
Run windings
By industry standard, the two T leads that are most often interchange to reverse the direction of a single phase motor are?
T5 and T8
A float switch that is used to control a motor directly must be rated to carry the________ of the motor
Full load current
The load terminals for a three phase motor starter protector are labelled…
T1
T2
T3
Does every motor require overload protection?
Yes, unless proven to be exempt
Overlook protection does not protect a motor from short circuits, motors are protected from short circuits by___________ and ____________.
Fuses
Breakers
An open line feeding a three phase motor starter can cause a motor to hum, not spin, fast, and labor, this condition is referred to as……
Single phasing
What are two basic types of O/L relays?
Thermal
Magnetic
What are the two major types of thermal overload relays?
Solder pot
Bi-metallic
What are the two major types of magnetic overload relays?
Electronic
Dashpot
The contacts of a motor starter that carry the full load current of the motor are called __________,_________ or _________ contacts.
Pole
Line
Load
The contacts of a motor starter that do not carry motor currents are called?
Auxiliary contacts
Took of control method allows an operator to connect a motor momentarily at reduced voltage to cost small movements of motor driven machinery?
Inching
“Two wire control” provides “no or low-voltage__________”
Release
Multiple stop buttons that control a magnetic motor starter are connected in_____________.
Series
The contact used to maintain a circuit after the start button has been released is called the……
Holding contact
Control circuit diagram that is used to illustrate the logical relationship of the circuits and its components, without regard to actual location of components, it’s called……….
Line diagram
What is the contact that will open motor control circuit in the event of prolong overcurrent?
Overload contact
“Three wire control” provides “no or low voltage _____________”
Protection
Teresa a fractional manual motor starter after an overload, the switch has to be moved to the full________ position before the motor can be restarted
Off
Additional start buttons added to control a magnetic motor starter protector are always connected in _________ with existing start button
Parallel
Magnetic control circuits use_____________ energy to close switches
Electromagnet
What are the three names given to the contacts of a motor starter protector that carry the full load current of a motor?
Pole
Line
Load
What’s the name of the contact of a motor starter protector that does not usually carry the full load current of a motor
Auxiliary contacts
The ring used to prevent chattering of the stationary and moving components of a motor starter coil is called
Shading coil
Push buttons are manual and momentary contact devices
True or false
True
What are two other names for line diagrams?
Schematic and ladder
Schematic diagrams are read from:
Left to right top to bottom ?
Right to left bottom to top ?
Top to left bottom to right ?
Left or right top to bottom
What type of diagram shows all components of the system in physical relation to each other complete with connecting wire wires?
Wiring diagram
Type of diagram shows the control devices in their logical order of operations without regard to their physical location
Line (ladder) diagram
What are the three basic sectors of a control circuit?
Stop sector
Start sector
Run sector
In a manual control circuit, operation of the circuit is dependent on?
An operator physically activating a manual device
What type of control circuit is dependent on the activation of both manual device devices by operator and activation of automatic device devices such as a limit switch float switch or timer?
Semi automatic
Manual control does not provide no voltage or low voltage protection, true or false
True
Motor service that incorporates overload protection is also a?
Motor protector
What does low-voltage and no voltage protection ensure?
The safety of the operator
When a magnetic motor starter protector is used with pilot devices a better degree of ________can be achieved?
Control
Button contacts may be normally open or normally closed
True or false
True
How must additional start buttons be connected with existing start button buttons?
In parallel
How much does additional buttons be connected with existing stop buttons?
Series
What is a control relay?
Small electromagnetic device
Which control relay typically used for?
Enhance the flexibility and compatibility of a control circuit
What’s ensuring that two or more motors start in a specific order known as?
Sequence control
When installing motor control system, list, four major factors to consider concerning the power system
Power supply
Motor horse power
Motor in rush current
Environment
Where is the best place to look for specific information about a motor?
Motor face plate
What type of control has no dependence on automatic functions?
Manual
What type of control has no dependent on manual function?
Automatic
What type of control is dependent on stop and start function
Semi automatic
Jogging is momentarily connecting motor to full line voltage
True or false
True
Inching is momentarily connecting motor to reduced voltage
True or false
True
What is the most common method of controlling a speed of an AC motor?
Variable frequency control
What is meant by the term ramping?
The acceleration of a motor from rest to full speed over a period of time
