Electrical power lap reports

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Laboratory Exercise 1

Motor Control

Procedure

1. Add numbers to the drawing signifying wire numbers.

2. Remove the coil from the starter and find and identify the contactors. If possible, remove one of the contactors and show to the instructor.

3. With sticky-notes, identify each of the following:

power leads

overloads

overload contact

contactor

coil

auxiliary contact (aux contact)

motor leads (T leads)

When complete, have instructor initial here:

______________________________________

4. Re-install the coil and wire the circuit using wire provided. Tag each wire with either a sticky label or other means using the numbers assigned above.

5. Have the circuit checked by the instructor. Do not attempt to hook up to any available voltage. This circuit will be checked without power.

6. When done, have instructor verify the circuit is acceptable by initialing the blank below:

______________________________________

7. Question: Why do contactors become pitted and need to be replaced?

The following diagram shows the major components of a Motor Starter:

Motor Starter with several components removed and contactor exposed.

Auxiliary Contact can be easily removed when the coil is removed

The Coil is shown with the iron core that magnetizes when current flows

Contacts are exposed when the contact cover is removed

Contacts shown in engaged position. This happens when the

coil conducts. The motor will start and run in this condition.

Contacts shown in engaged position. This happens when the coil conducts. The motor will start and run in this condition.

Start PB

Stop PB

Motor

Jog-F

Start PB

Stop PB

Motor Jog-F

Power Leads

OverloadsOverload

Contact (NC)

Contactor

Coil

Auxiliary

Contact

Motor Leads (T Leads)

Power Leads

Overloads

Overload Contact (NC)

Contactor

Coil

Auxiliary Contact

Motor Leads (T Leads)

Motor Starter with several

components removed and

contactor exposed.

Auxiliary Contact can be easily

removed when the coil is removed

The Coil is shown with the iron core

that magnetizes when current flows

Contacts are exposed when

the contact cover is removed