ENGINEERING PRACTICE. UNIVERSITI TEKNIKAL MALAYSIA MELAKA (UTeM) MOTOR STARTER LABSHEET

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UNIVERSITI TEKNIKAL MALAYSIA MELAKA (UTeM) MOTOR STARTER Instruction: 1. Read and understand the procedures first before commencing any wiring. 2.

1 UNIVERSITI TEKNIKAL MALAYSIA MELAKA (UTeM) MOTOR STARTER Instruction: 1. Read and understand the procedures first before commencing any wiring. 2. Each report is to be duly completed and submitted before the start of the next workshop session. GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 1 -

2 Part 1 - Direct On-Line (D.O.L) Motor Starter Objective: 1. To learn about the operation of three-phase Direct On-Line (D.O.L) motor starter. 2. To become familiar with the correct wiring method of three-phase Direct On-Line (D.O.L) motor starter. Equipment: No. Equipment Qty 1 Single-Phase Miniature circuit breaker 1 2 Three-Phase Miniature circuit breaker 1 3 Three-Phase Thermal Overload Relay 1 4 Biased switch (start button) 1 5 Biased switch (stop button) 1 6 Indicator lamp 1 7 Three-Phase Contactor 1 8 Three-Phase Induction motor 1 9 Cables (red, yellow,blue,black,green) As required Figure 1 Direct On Line Motor Starter Schematic Diagram GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 2 -

3 Procedure: UNIVERSITI TEKNIKAL IMPORTANT: ANY CONNECTION TO THE POWER SUPPLY & MOTOR MUST BE ACCOMPANIED BY INSTRUCTOR. 1. Ensure all power supplies are disconnected before commencing any wiring. 2. Perform components functionality test as per test sheet. 3. Using all the components given to you, wire-up the Direct On-Line motor starter circuit as shown in Figure 1. Starts with the control circuit wiring. 4. After the control circuit has been wired-up, get the permission and assistant from the instructor before making connections to the supply 240V. 5. Connect the power supply to the control circuit. Ensure the voltage is correct. Beware Live 240V electricity is present. 6. Turn-on the power supply. Test the control circuit and observe its operation. Rewire the control circuit if the outputs are different from theory and retest its operation. 7. Turn-off and disconnect the power supply. 8. Once the control circuit has been completed and tested accordingly, wire-up the D.O.L main circuit. DO NOT CONNECT to the power supply and motor just yet. 9. After the main circuit has been wired-up, get the permission and assistant from the instructor before making connections to the motor. 10. Press and release the START button. Observe and record down what happen in the control and main circuits. 11. Press and release the STOP button. Observe and record down what happen in the control and main circuits. 12. Test the tripping function of the thermal overload relay with a test pen. 13. Answer all questions in the test sheet. 14. Write a laboratory report. GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 3 -

4 Part 2 - Direct On-Line (D.O.L) Forward-Reverse Motor Starter Objective: 1. To learn about the operation of three-phase Direct On-Line (D.O.L) Forward-Reverse motor starter. 2. To become familiar with the correct wiring method of three-phase Direct On-Line (D.O.L) Forward-Reverse motor starter. 3. To learn about wiring scheme that controls the direction of a motor rotation. Equipment: No. Equipment Qty 1 Single-Phase Miniature circuit breaker 1 2 Three-Phase Miniature circuit breaker 1 3 Three-Phase Thermal Overload Relay 1 4 Biased switch (start button) 2 5 Biased switch (stop button) 1 6 Indicator lamp 3 7 Three-Phase Contactor 2 8 Three-Phase Induction motor 1 9 Cables As required Figure 2 Direct On Line Forward-Reversed Motor Starter Schematic Diagram GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 4 -

5 Procedure: UNIVERSITI TEKNIKAL IMPORTANT: ANY CONNECTION TO THE POWER SUPPLY & MOTOR MUST BE ACCOMPANIED BY INSTRUCTOR. 1. Ensure all power supplies are disconnected before commencing any wiring. 2. Perform components functionality test as per test sheet. 3. Using all the components given to you, wire-up the Direct On-Line Forward-Reverse motor starter circuit as shown in Figure 2. Starts with the control circuit wiring. 4. After the control circuit has been wired-up, get the permission and assistant from the instructor before making connections to the supply 240V. 5. Connect the power supply to the control circuit. Ensure the voltage is correct. Beware Live 240V electricity is present. 6. Turn-on the power supply. Test the control circuit and observe its operation. Rewire the control circuit if the outputs are different from theory and retest its operation. 7. Turn-off and disconnect the power supply. 8. Once the control circuit has been completed and tested accordingly, wire-up the D.O.L Forward- Reverse main circuit. DO NOT CONNECT to the power supply and motor just yet. 9. After the main circuit has been wired-up, get the permission and assistant from the instructor before making connections to the motor. 10. Press and release the F button. Observe and record down what happen in the control circuit, main circuit and the direction of the motor rotation. 11. Press and release the STOP button. Observe and record down what happen in the control circuit, main circuit and the motor. 12. Press and release the R button. Observe and record down what happen in the control circuit, main circuit and the direction of the motor rotation. 13. Press and release the STOP button. Observe and record down what happen in the control circuit, main circuit and the motor. 15. Test the tripping function of the thermal overload relay with a test pen. 16. Answer all questions in the test sheet. 17. Write a laboratory report. GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 5 -

6 Part 3 STAR-DELTA Motor Starter Objective: 1. To learn about the operation of three-phase Star-Delta motor starter. 2. To become familiar with the correct wiring method of three-phase Star-Delta motor starter. 3. To learn the differences between the Star-Delta and D.O.L motor starter wiring and operation. Equipment: No. Equipment Qty 1 Single-Phase Miniature circuit breaker 1 2 Three-Phase Miniature circuit breaker 1 3 Three-Phase Thermal Overload Relay 1 4 Biased switch (start button) 2 5 Biased switch (stop button) 1 6 Indicator lamp 2 7 Three-Phase Contactor 3 8 Three-Phase Induction motor 1 9 Timer 1 10 Cables As required Figure 3 Star-Delta Motor Starter Schematic Diagram GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 6 -

7 Procedure: UNIVERSITI TEKNIKAL IMPORTANT: ANY CONNECTION TO THE POWER SUPPLY & MOTOR MUST BE ACCOMPANIED BY INSTRUCTOR. 1. Ensure all power supplies are disconnected before commencing any wiring. 2. Perform components functionality test as per test sheet. 3. Using all the components given to you, wire-up the Star-Delta motor starter circuit as shown in Figure 3. Starts with the control circuit wiring. 4. Set the Timer time to 5 seconds. 5. After the control circuit has been wired-up, get the permission and assistant from the instructor before making connections to the supply 240V. 6. Connect the power supply to the control circuit. Ensure the voltage is correct. Beware Live 240V electricity is present. 7. Turn-on the power supply. Test the control circuit and observe its operation. Rewire the control circuit if the outputs are different from theory and retest its operation. 8. Turn-off and disconnect the power supply. 9. Once the control circuit has been completed and tested accordingly, wire-up the Star-Delta main circuit. DO NOT CONNECT to the power supply and motor just yet. 10. After the main circuit has been wired-up, get the permission and assistant from the instructor before making connections to the motor. 11. Press and release the START button. Observe and record down what happen in the control circuit, main contactor, Star contactor, Delta Contactor and the motor. 12. Press and release the STOP button. Observe and record down what happen in the control circuit, main circuit and the motor. 13. Test the tripping function of the thermal overload relay with a test pen. 14. Answer all questions in the test sheet. 15. Write a laboratory report. GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 7 -

8 Sample of Laboratory Report Title: Circuit Diagram: Testing: No. Test 1 Motor Polarity Test 2 Circuit Continuity Test 3 Circuit Insulation Test 4 Circuit Grounding Test 5 Thermal Overload Relay Test Observation: Events that occur during circuit operation Discussion: Describe the detail operation of the motor starter circuit. Conclusion: Things learned from the experiment. GROUP : FKE DURATION : 5 DAYS DATE : 16 May 22 July 2011 PAGE : - 8 -

ELECTRICAL SERVICE TECHNICIAN EXAMINATION 25 November 2017 QUESTION AND ANSWER BOOKLET

Candidate Code No. EST 2075 For Board Use Only Result Date Int Result Date Int ELECTRICAL SERVICE TECHNICIAN EXAMINATION 25 November 2017 QUESTION AND ANSWER BOOKLET INSTRUCTIONS READ CAREFULLY Time Allowed: