03 Wk3 Lab 3-Manual Motor Starter Hand Off Start-F josh0030 PDF

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Name:

NISARG JOSHI

Student Number 040882951

03. Manual Motor Starter and Hand-Off-Auto Control Pre-lab 1. 2.

Complete questions 1 to 9. Read the circuit description and use it to prepare the drawing using the proper format.

Equipment 1 motor control work station

1 multi meter and test leads

Circuit Description 3a) The single phase motor is controlled by the manual motor starter. Draw Ladder and wiring circuit diagrams below

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3b) Draw Ladder and wiring circuit diagrams below for 1. Control the three phase motor with the magnetic motor starter. 2. Control the magnetic motor starter with a hand-off-auto selector switch. a. in the hand position the motor starter coil is energized b. in the off position the motor cannot be started c. in the auto position the motor starter coil is controlled by a thermostat

Procedure 1. Connect the single phase motor controlled by the manual motor starter as described in Lab 3a. 2. Connect the three phase motor as described in Lab 3b. 2. What is the part number of the correct size of overload for the motor? What is the part number of overload that is installed?

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2. correct overload part number (from table in switch cover) installed overload part number Table 3-1: Manual motor starter overloads. Questions 1. What does the term “disconnecting means” mean in the CEC?

A. Disconnecting means open all ungrounded supply to conductors to a motors.

2. Can a manual motor starter be used as a “disconnecting means”? Rule ___________

3. What two functions does a “motor starter” perform? 1. Motor starter is used to control the operation(electric current) of motor. 2. It protects motor from drawing to much current and over-heating.

4. What is the function of a motor overload device? A. The main function of motor overload device is to protect motor, motor apparatus and motor branch circuit conductors from over-heating which is occured due to motor - loads.

5. How many overload devices are requires for a single phase, 120 volt motor? Only ONE overload device according to NEC.

Rule ___________

6. How many overload devices are requires for a single phase, 240 volt motor? Only ONE

Rule ___________

Notes:

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7. Is the circuit in this experiment an example of no-voltage-release or no-voltageprotection?

A. No - Voltage Protection 8. What is the function of the hand-off-auto selector switch and where would it be used?

A. The main function of hand-off selector is to allow operator to switch between auto or manual operation of a motor.

9. Can the off position of the hand-off-auto switch be used as a disconnecting means?

A. Yes, we can use this in off position because its all connections are open Rule ____________

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