WARNING
Make sure the whole control station is not energized before touching or starting your exercise!
Objective
Learn how to wire 24V DC pilot light with push buttons to turn it on/off.
Material
Multimeter
AC/DC power supply. Input 120V AC and output 24V DC, 1A (at least)
Push button (green )
Push button (red)
Pilot light (green). 24V DC
What to do
Connect the pilot light after the start button
Set on the power supply
Use the following ladder diagram:
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| Ladder diagram for pilot light |
The pilot light should turn on when the start button is pushed and turn off when the button is not depressed
Check for continuity if needed
How to do it
For this exercise the same setup developed for LE 02 is to be used. Details shall be omitted and refer to LE 02 for more information.
Step 1. Identification of the pilot light
The pilot light has two terminals only labeled as X1 and X2 as shown,
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| Side and bottom view of a pilot light |
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| Side and bottom view of a pilot light |
Step 2. Pilot light connection
Starting with the setup for LE 02 you just need to connect terminal 24 to X1 and then X2 to the DC (-) block. For simplicity follow the, labeled, ladder diagram below.
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| Numbered ladder diagram for pilot light |
Step 3. Energizing the loop
In order to power the loop you should activate the circuit breaker to the ON position with the lever upl and the green indicator being shown.
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| Thermal circuit breaker |
Step 4. Continuity and DC voltage test
Check for continuity at every contact and for 24V DC using the multimeter. Since you are using a power source for 24V DC you should get a reading not far from this value.
Continue your training with the next exercise
Any question? Write in the comments and I shall try to help.
Other stuff of interest
- LE01 - AC and DC voltage measurement and continuity test
- LE 02 - Start and stop push button installation 24V DC
- About PID controllers
- Ways to control a process
- About pilot lights
- Solving the Colebrook equation
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Ildebrando.
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