INTRODUCTION

In this assignment, you will measure resistance across a DC motor and learn to troubleshoot relays. You have already measured voltage, current, and resistance, so this assignment applies those measurement skills to diagnosing issues in DC loads, an essential skill for maintaining automated machinery.

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OBJECTIVE

Measure resistance across a DC motor.
Learn to troubleshoot a relay.

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MATERIALS + TROUBLESHOOTING REFERENCE PAGES

NOTE: In addition to the Basic Electrical Trainer, you will also need to use the Basic Automation Trainer board (sometimes called red boards). Do not change any of the wiring on the red board. You will only be using the conveyor on the red board. Disconnect the wires from the conveyor motor and measure resistance across that.

Please use the relay on the Electrical Systems board.

Basic Electrical Trainer
Basic Automation Trainer board
Lockout Tagout
Conveyor
24 VDC Motor
24 VDC SPDT Relay
8-Pin Relay Socket

Tools:

Multimeter

Reference Page:

Resistance

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TROUBLESHOOTING VIDEOS

Watch the following videos to learn how to troubleshoot the new components.

Motor

Relay

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INSTRUCTIONS

Watch the example lab video, and then perform the lab.

NOTE: You will need to use the Basic Automation Trainer board (sometimes called red boards). Do not change any of the wiring on the red board. You will only be using the conveyor on the red board. Disconnect the wires from the conveyor motor and measure resistance across that.

Please use the relay on the Electrical Systems board.

Measure the resistance across:
- The connections of the DC Conveyor Motor.
- The relay coil pins 2 (A1) and 7 (A2). Make sure to put the relay into the socket and measure across the screws. Do not measure the pins of the actual relay. The screws will not give a reading unless they are tightened, or you can put the probes under the screws.

	Remember!
	The screws will not give a reading unless they are tightened, or you can put the probes under the screws.

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SUBMISSION

After completing the lab, answer the questions in the quiz.