Abstract
A brief description of the experiment. The abstract should not exceed four or five sentences.
Introduction
In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report.
Conclusions
This section should reflect your understanding of the experiment. Important points to include are a brief discussion of your final results, an interpretation of the actual experimental results as they apply to the objectives of the experiment set out in the introduction should be given
ANSWER ALL THE QUESTIONS
EET220
Industrial Applications
Instructor: enter instructor name
Lab 1
Silicon Controlled Rectifier (SCR) Operation
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Honor Pledge:
I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to the Judicial Review Board hearing if summoned.
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Student Name Date: 1/1/2018
Adding your name here constitutes your agreement to the Honor Pledge as stated.
Contents Abstract 3 Introduction 3 Part 1: Methods and Procedures 4 Part 1: Results and Figures 5 Conclusion 9 References 10
Abstract
|
(This instruction box is to be deleted before submission of Lab report) What is an Abstract? Write the Abstract, Introduction and Conclusion last! This should include a brief description of all parts of the lab. The abstract should be complete in itself. It should summarize the entire lab; what you did, why you did it, the results and your conclusion. Think of it as a summary to include all work done. It has to be succinct but yet detailed enough for a person to know what this report deals with in its entirety. |
I ntroduction
|
(This instruction box is to be deleted before submission of Lab report) What is an Introduction? Write the Abstract, Introduction and Conclusion last! In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report. State the objectives of the lab as well as the overall background of the relevant topic. |
Part 1: Methods and Procedures
Objectives:
1. To verify the operation of SCR using DC triggering.
2. To demonstrate the phase control operation of SCR using AC triggering.
Procedures:
1. Research the datasheet of 2N1599 SCR and fill the following table 1 at 250C.
|
Parameter |
Value |
|
IT(RMS) – Forward current RMS |
1.5A |
|
IH – Holding current |
5.0mA |
|
VDRM – Peak forward blocking voltage |
400V |
|
IGT – Gate trigger current (typical) |
2.0mA |
|
IDRM – Peak forward blocking current |
1.0mA |
|
VTM – Forward on voltage (typical) |
1.1V |
Table 1: Specifications of EC103D1 SCR
Part I: SCR Operation – DC Triggering
2. Construct the circuit as shown in the Figure 1. (use jumpers as a switch)
Figure 1: SCR DC Triggering
3. Connect the gate switch (S1) to R2, and then run the simulation. Do not stop the simulation until you complete table 2.
4. Measure the voltage at the gate terminal and record the measured value in the first row of the table 2 under gate voltage.
5. Measure the voltage between anode and cathode of the SCR and record the measured value in the first row of the table 2 under SCR voltage.
6. Indicate the condition of the SCR whether it is on or off based on the lamp condition.
7. Change the position of the switch in the order as indicated in table 2 below and repeat steps 4 through 6.
|
Gate connection |
Gate Voltage (VG) |
SCR Voltage (VAK) |
SCR/Lamp condition (On/Off) |
|
R2 |
1.2mV |
11.928 V |
off |
|
R1 |
753.874mV |
1.001V |
on |
|
R2 |
1.2mV |
1.001V |
on |
Table 2: Voltage measurements and condition of SCR
Part II: Phase control of SCR – AC Triggering
1. Modify the previous circuit as shown below.
Modify the number of turns to 12:0.5:0.5 by double clicking on the transformer
Figure 2: SCR Phase control – AC Triggering
2. Turn the potentiometer (R2) to 0%, which represents the firing angle to be approximately 1800. Then Run the simulation.
a. Since the firing angle is 1800, no power delivered to the lamp and it should be off.
3. The signals on the oscilloscope should be as shown below. Blue one across SCR & Red one across lamp (separate both signals so you can see them clearly).
Figure 3: Oscilloscope waveforms
4. Change the potentiometer in steps of 25%, take the screenshot of the oscilloscope image (use snipping tool), and insert below.
Potentiometer @ 25%:
Potentiometer @ 50%:
Potentiometer @ 75%:
Potentiometer @ 100%:
Answer the following Experiment Questions:
1. Before firing, the voltage from anode to the cathode is _____B______.
a. 0 V b. Approximately Equal to VCC.
2. If the gate is made ___B_____ when the anode and cathode are forward-biased, the SCR turns on.
a. Negative b. Positive
3. The SCR will ___A____ when the gate potential is removed and the anode/cathode are forward-biased.
a. Remain on b. Turn off
4. When the SCR is off, the voltage from the anode to ground is __B______.
a. Close to VCC b. Near 0
5. The SCR will turn off when the current flowing through it drops below the ___Holding Current__________ value.
Conclusion
|
(This instruction box is to be deleted before submission of Lab report) What is a Conclusion? Write the Abstract, Introduction and Conclusion last! This section should reflect your understanding of the experiment conducted. Important points to include are a brief discussion of your results, an interpretation of the actual experimental results as they apply to the objectives of the experiment set out in the introduction should be given. Also, discuss any problems encountered and how they were resolved. |
(Students need to write this).
References
Bartelt, T. L. (2011). Industrial Automated Systems: Instrumentation and Motion Control. Cengage Limited. https://ecpi.vitalsource.com/books/9781305474277
2N1595-2N1599 – digitroncorp.com. (n.d.). https://digitroncorp.com/getmedia/ce1eddd8-0ef1-45e7-a824-acd2c25bc417/2N1595-2N1599.aspx?ext=.pdf&ext=.pdf&ext=.pdf&ext=.pdf
(2017) National Instruments Multisim (V 14.1) [Windows]. Retrieved from http://www.ni.com/multisim/
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