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Yes. So that means it is NOT there to power the motor. In other words, the function of the PWM line is INFORMATION not POWER. The motor is powered from VDC and DC GND.
If his intention with the PWM measurement was to measure the operating voltage for the motor, then he doesn’t know what he’s talking about.
I’ll ask my previous question again: What is the FUNCTION of the PWM line to a BLDC motor?
measure the voltage supply from Ground to PWM. Was what he did valid?
Depends on what the intention was with his measurement. What would he be measuring in this case?
Re-read the list of modules and units in the Fundamentals and Refrigerates courses. Which modules and units do you think would talk about BLDC motors?
If I want to measure voltage supply from the motor on the control board
Other way around: the board supplies the motor with voltage.
I have to measure from DC ground to the PWM, correct?
Think again about what you’re measuring here. What is the function of the PWM line?
Measuring voltage between DC supply and ground would just be supply voltage.
Correct! This is the operating voltage that powers the motor.
The schematic must be labeled to identify the pins.
You are learning the basic principles in the course. It is not possible to show you every possible depiction you may encounter in the field. What you are learning are the principles and way of thinking. Your mastery of these principles comes with your applying them in the field. This is how it works with any trade. Be patient, continue the coursework, and apply what you learn here.
It would be more productive if you would provide schematics that you have questions about since I have no way of knowing how exactly you are “iffy.” You have access to the downloads at Appliantology. Go rummage through them.
What about the kind of voltage supply you would measure for? AC? DC? No See? You see?
Do BLDC motor has 4 lines when it’s shown on a schematic?
BLDC motors are very versatile. They can be 2, 3 or 4 wire configurations depending on the application and engineering control objectives.
The extra 2 lines on bldc motors are there for the PWM and RPM right?
Typically, yes.
If im not wrong, bldc needs an inverter as part of an bldc vfd.
Yes. On smaller BLDC motors, such as evaporator or condenser fan motors, the inverter will be built into the motor casing.
What is the importance of recognizing a bldc motor on a schematic?
Why do you think it would be important to distinguish a BLDC motor from a shaded pole motor? How would this affect doing step 4 of the Ten Step Tango?
Which module and unit are you referring to?
October 2, 2019 at 12:03 pm in reply to: Module 5 Unit 4: Using Schematics to Troubleshoot Appliances #16824LOWz and VAC. I don’t quite understand that. DO you ave a video explaining that concept more in depth?
Yes, but you have to promise to really watch it this time. 🙂
This webinar recording at Appliantology goes into great detail explaining this principle of low input impedance meters and ghost voltage.
Always glad to help. Keep at it! Take good notes as you go through the course. Be sure to watch all the videos, even the long ones, making notes as you watch. And ask questions here as often as you need to.
I feel like the concept on time chart is not discussed enough because I completely don’t know how to read one and how to trace those lines onto the schematic diagram.
As stated in the lesson:
This video is about as advanced as we’ll get in the Fundamentals course. If you like this video, it’s a foretaste of what awaits you in the Advanced Troubleshooting course where we go into great detail on topics such as open neutrals, alternate neutral pathways, and troubleshooting appliances with electronic control boards.
Which is why the quiz did not have any questions on timer charts. In general, throughout the course, let the quiz questions be your guide as to what you are expected to get out of the lesson.
Do i need to understand thoroughly time chart now in order to move on to the next lessons?
No, move on. You’ll circle back to timer charts in detail in the Advanced Troubleshooting course. The point here is to expose you to different troubleshooting techniques and some of the technical literature that you will use to troubleshoot, such as schematics and timer charts. Also remember: you can and should watch the videos multiple times and you should be making notes of both specific questions and the time in the video where your question occurred.
Same thing goes for cheater cord I don’t quite know how it works just yet.
Did you watch the webinar video at the end of Module 5, Unit 4? Does “cheat the load, jump the switch” ring a bell?
By the way the Mdule 5 unit 5 talks about dryer.
We’re using a dryer to illustrate the troubleshooting technique of half-splitting. This is the main point you should get out of the video. Half-splitting is a powerful troubleshooting technique you can use to eliminate parts of the circuit that are not causative to the problem you’re troubleshooting and hone in on the parts of the circuit that are part of the problem. In this module, TROUBLESHOOTING, you are learning the lost science of troubleshooting. We are teaching you this using real world appliances rather than abstract circuits. At the same time, you are getting accustomed to seeing how different manufacturers present technical information.
I don’t find any course teaching about fixing washer or dryer on the website.
That’s an entirely different course that we are currently developing and due to release in October. In this course, you are learning the Fundamentals of appliance repair: how electricity and circuits work, how to troubleshoot like a real technician, gas, motors, etc.
Can i skip this chapter?
Which chapter are you referring to?
No the component is functioning just fine it’s just that the meter can’t pick up a proper number
Exactly right! If that’s the case, then, why bother with a continuity measurement?
Let’s use another example:
Suppose you’re testing a component with a spec of 5 k-ohms. In most meters, the continuity setting tops out at 1k-ohm. If the component resistance is higher than 1 k-ohm, the meter on continuity setting will report open. Does this mean the component “bad” (ie., out of spec)?
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