Single Motor Control 030204f Flashcards
What are the 3 sections of a control circuit?
Stop Circuit.
Start Circuit.
Holding Circuit.
What is the purpose of the stop section in a control circuit and what must it be able to do?
De-energize the coil.
Must be able to override control devices in both the start and holding sections.
What are interlocks in a motor circuit?
Contacts wired into a control circuit of a motor. Purpose is to ensure the operation of the motor is tied to another operation at the same time.
If interlocks are connected in series with the stop button what will it affect?
Will affect the starting and running of a motor.
A condition will need to be met prior to the motor being able to be started.
What does having an interlock connected in series with the start button affect?
Will only affect the starting of a motor.
What does connecting interlocks in series with the holding contacts affect?
Will only affect the running of a motor.
What are some common uses for pilot lights for motors?
Control power.
Motor running.
Motor stopped.
Trip due to overload.
What is a low-voltage release circuit?
May automatically restart when the power comes back on to a circuit.
What is a low-voltage protection circuit?
Will not automatically restart when the power to a circuit comes back on.
What are some examples of applications for a low-voltage release circuit?
Sump pumps.
Air conditioning units.
Hot water heating pumps.
Heating, ventilation, and air conditioning (HVAC) fans.
What is referred to as 2 wire control?
Only two control circuit conductors are required between the control device and the motor starter enclosure. Only one control device is used.
What are some examples of applications for a low-voltage protection circuit?
Lathes.
Band saws.
Escalators.
Industrial processes.
What kind of circuit uses a 3 wire control?
Low-voltage protection.
Requires 3 control conductors between the stop/start buttons and the motor starter enclosure.
