Title: Lab 4-3: Using a Timing Relay
Course: Electrical Motor Controls (Sandbox) > Section: Module 4: Control Relays and Timing Relays, 20 hr

Introduction

Background

The timing relays on your trainers work just like control relays, except for the contacts don't immediately change state when the coil is energized. Instead, when the coil is energized, a specified amount of time elapses and then the contacts change state. Terminals 2 and 7 energize the coil on the timing relay found on your trainer and can be powered by AC or DC voltages.

When wiring up these contacts with AC voltage, it does not matter which terminal is connected to hot and which is connected to neutral. However, it does matter for DC Voltage. When wiring DC, connect the terminal 7 to  DC+, and connect terminal 2 to DC-.

Assignment

In the circuit you build, set the timing relay for 5 seconds. When you turn the "On/Off" switch on (needs to be a maintained switch), the timing relay coil becomes energized. The time specified on the timing relay elapses (5 seconds in this case) and then the timing relay contact closes, which, in turn, sends electricity to the light.

In other words, the light turns on 5 seconds after you turn on the "On/Off" Switch.

Now that you know how to use timing relays, you will build the next circuit. The following videos (the link is a video) will walk you through the steps of building the circuit.

Automation Studio: How to Simulate a Circuit with a Timing Relay (2 minute video)

Lab Instructions

1. Watch the video introduction to this lab.
2. Draw a schematic diagram, in Automation Studio or by hand, that represents a circuit that will operate as described in the video.
3. Unplug the Motor Controls trainer.
4. Build the circuit on the Motor Controls trainer.
5. Plug in and turn on the Motor Controls trainer.
6. Test the circuit.
7. The timing relay causes the light to turn on 5 seconds after a user turns on the "On/Off" Switch.

Submission

To complete this lab, submit a 30-second video following the criteria found in the rubric. If you are working with another student, each of you must record and submit your own video.

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