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WEG CFW500 VFD PID Overview from AutomationDirect


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To learn more: https://www.AutomationDirect.com/drives?utm_source=I8x2UdZc6vM&utm_medium=VideoTeamDescription

(VID-DR-0324)

A quick overview of the WEG CFW500 Variable Frequency Drive (VFD) PID capabilities. This drive actually has THREE different PID implementations. 1. The drives usual native PID. 2. A Soft PLC version of drive control PID that has extra features, and 3. A soft PLC version of PID that can be used to control OTHER processes

just like any PLC. There is also a Sleep Mode that uses PID to automatically fill tanks for example. Lot of PID options: Just one more reason this feature rich VFD is such a great value!

PID Support Files And Configuration Tools: https://cdn.automationdirect.com/static/video-resources/drives/WEG_CFW500/CFW500-PID-Support-Files.zip

Online Support Page: https://community.automationdirect.com/s/?utm_source=I8x2UdZc6vM&utm_medium=VideoTeamDescription

**Please check our website for our most up-to-date product pricing and availability.


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The WEG CFW500 Drive has three different PID implementations. The first one is part of the drive’s native parameter set. It’s your basic PID implementation that allows the drive to automatically adjust the motor’s speed to maintain whatever process you are monitoring. Typically, temperature, pressure or flow – stuff like that. The second PID implementation is referred to as the “Internal PID.” It does everything the native PID does except It’s an application that you load into the drive’s built-in PLC. It also adds the ability to use a second analog input to bias the feedback result as a sum, difference or average. And it has low and high-level alarms. You can use this one or the drive’s native PID, you can’t use both because they both want to control the same motor. The third PID implementation is referred to as the “External PID” and it is also an application you load into the drive’s built-in PLC. Instead of controlling the drive’s output to the motor, it controls an Analog output which you can then use to control some other external actuator just like you would with any PLC or controller. So this is just a generic PLC-based PID that you can use for whatever you want and you can use it while running the drive’s built-in PID. Which means you can have the drive controlling a motor and the built-in PLC controlling another process. Which saves you the cost of having to buy separate PLC to control that other process! Here’s the plan: This video is just a quick overview. We’ll then take a few minutes to understand and characterize the hardware we’ll be using in this series. That’s always the first and most important step when implementing PID. You need to make sure you understand what your hardware is capable of and how it performs, so don’t skip that one. Next, we’ll show you how to set up the parameters and how to use the drive’s native PID. And I’ll show you the trick I use to massively simplify and track all the PID related parameters. Then we’ll show you how to use the Internal PID implementation. It’s pretty much the same thing except you have to load the PID application into the built-in PLC first and it uses different parameter numbers and has a couple extra options. The external PID implementation uses the exact steps and doesn’t really have anything to do with the drive’s motor control so I’m going to skip that one for now. Maybe I’ll do a video on that guy if enough folks ask for it in the comments below the video. Finally, we’ll do a sleep mode example which is great for applications where you want PID to automatically fill a tank to some level, but then go to sleep until the tank drains down to some lower level where PID wakes up and automatically fills the tank again. That way the drive isn’t burning power trying to automatically maintain a tank level. One side note: We did a whole series of videos that did similar quick starts for the WEG CFW100 and CFW300 drives AND then also broke up the whole PID algorithm up into small bite sized chunks where you can learn all about the Setpoint options, tuning a PID loop, noise reduction techniques, how to use bumpless modes, pretty much every aspect of using PID. While those all use the WEG CFW300 drive, the same concepts apply here too. The only thing to be aware of is those smaller drives only have the PLC version of PID, they don’t have the native drive parameter version that the CFW500 has and the CFW500 PID will typically have more options. But the concepts are the same and will definitely get you close enough. In this WEG CFW500 series, we’re just going to focus on getting you up and running quickly with these videos. Ready? Join me in the next video where we learn about the hardware we will be using. Again, understanding your hardware is the most important step to successfully implementing PID. Meanwhile, click here to learn more about the WEG CFW500 Variable Frequency Drives. Click here to learn about AutomationDirect’s free award-winning support options and click here to subscribe to our YouTube channel so you will be notified when we publish more videos like this one.



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