Drawings & Basic Circuits Flashcards
What is meant when the term “Normally Open Contact” is used?
It means the contact is open when the relay coil is de-energized
In what condition are automatic thermal, pressure, and mechanical limit device symbols drawn?
These symbols are drawn in the condition before their armature has moved. They are drawn in a de-energized state
What type of diagram would show the internal connections needed within a push button station?
A Wiring Diagram
What is the most suitable drawing to use to determine a system’s logical sequence of operation?
A Schematic Diagram
What is the name of the diagram that disregards the physical location of the circuit componets in order to provide a simple picture of the various interconnected componets and how they function progressively?
A Schematic Diagram
What kind of drawing shows the electrical connections between equipment?
An Interconnection Diagram
In a schematic diagram of a NEMA starter, which contacts are located between the motor coil and L2?
The overload contacts
A relay contact connected directly in series with the forward start button of a reversing motor control circuit would affect what?
It would affect the starting but not the stop in the forward direction
A motor is controlled by a start/stop station in a circuit with low voltage protection. Whent the start button is pressed, the motor starts but it stops once the start button is released. What could the problem be?
Faulty Holding Contact
What do schematic motor control diagrams most often contain?
Control circuits only
What are overload devices designed to do?
De-energize the motor if it ever became overloaded
What are the four basic types of drawings?
- Block Diagram
- Wiring Diagram
- Schematic Diagram
- Interconnection Diagram
What are the overload contacts labeled as on an IEC style motor starter?
95 and 96
What are the holding contacts labeled as on an IEC style motor starter?
13 and 14
What are the coil contacts labeled as on an IEC style motor starter?
A1 and A2
