Drive and frequence
- Thread starter issamty
- Start date
Is this thread a continuation of this other one?:
http://www.plctalk.net/qanda/showthread.php?t=104582
http://www.plctalk.net/qanda/showthread.php?t=104582
The other about the automation of the full system with RSlogix.
But here just about a general information.
Well, you're not providing enough information to help you. I only can give you a general answer.
From your original question, you need a control system to detect what machine is going to be operated by the motor. That control system will be in charge to set the correct frequency in the Altivar.
From your original question, you need a control system to detect what machine is going to be operated by the motor. That control system will be in charge to set the correct frequency in the Altivar.
gbradley
Lifetime Supporting Member
My take on your picture:
Altivar61 is turning a motor, and when it is requesting 0-15Hz speed turn on machines 1,2,3,4, when the motor gets up to 25Hz also turn on machines 5,6,7,8, as the speed reaches 40Hz turn on machines 9,10,11,12, and when it gets to 50HZ turn on the last four machines as well 13,14,15,16.
Did I guess right?
Altivar61 is turning a motor, and when it is requesting 0-15Hz speed turn on machines 1,2,3,4, when the motor gets up to 25Hz also turn on machines 5,6,7,8, as the speed reaches 40Hz turn on machines 9,10,11,12, and when it gets to 50HZ turn on the last four machines as well 13,14,15,16.
Did I guess right?
jraef
Member
How would one "turn on" machines that are running behind a single motor? Clutches? If so, bad idea, unless maybe they are fluid clutches or magnetic particle clutches that can be added slowly so that the drive can respond. Otherwise the immediate step change in load like that will likely cause a current spike that will shut down the drive, unless the motor is grossly over sized.
But we really don't know yet, because that sketch is devoid of details.
Mill_Control
Member
IF you're asking how to switch the drive between four different frequencies it can be done in several ways:
Select Preset frequencies using the drives digital inputs.
Command frequency using the drives analog input.
Numerous Comms options.
Select Preset frequencies using the drives digital inputs.
Command frequency using the drives analog input.
Numerous Comms options.
Thaks all for your answers.
let's explain my project step by step :
1)a drive (Altivar61) control one motor
2) this motor aspirate garbages from all machines
3) the responsible make decision to increment/decrement freqency in Altivar61 by knowing the numbers of machines that work (manually operation every 2/3 hours).
here we will lost a lot of energy, so, my best solution until now is to put a pressure sensor for every machine (and fix it value) and we caculate the total pressure of all machines (work ones) and connect this pressure to PLC (Allen-Bradley), so the PLC control the Altivar61 (via inputs).
the problem is that I want create a project in RSLogix 5000 but i didn't know how can I add an Altivar61 ? and how to connect it to PLC ? and for supervision, i will use FactoryTalk view (so the responsible can check the process if it work correctly or not from his desk and he can also change ATV61 frequency) , but the altivar61 communicate via ethernet/IP , how to make a relation between factorytalk and ethenet/Ip or it exists before ?! or can i use another type of communication for this drive ?
So, if somone have another solution for this problem, or response to my questions I will appreciate it.
Thank you all
let's explain my project step by step :
1)a drive (Altivar61) control one motor
2) this motor aspirate garbages from all machines
3) the responsible make decision to increment/decrement freqency in Altivar61 by knowing the numbers of machines that work (manually operation every 2/3 hours).
here we will lost a lot of energy, so, my best solution until now is to put a pressure sensor for every machine (and fix it value) and we caculate the total pressure of all machines (work ones) and connect this pressure to PLC (Allen-Bradley), so the PLC control the Altivar61 (via inputs).
the problem is that I want create a project in RSLogix 5000 but i didn't know how can I add an Altivar61 ? and how to connect it to PLC ? and for supervision, i will use FactoryTalk view (so the responsible can check the process if it work correctly or not from his desk and he can also change ATV61 frequency) , but the altivar61 communicate via ethernet/IP , how to make a relation between factorytalk and ethenet/Ip or it exists before ?! or can i use another type of communication for this drive ?
So, if somone have another solution for this problem, or response to my questions I will appreciate it.
Thank you all
If I understood correctly, you are dealing with a waste extraction system: an extractor unit and ducts collecting garbage from different points (machines). I worked with a paper extraction system (newspaper company) but the motor was operated at fixed speed: when a machine needed to be stopped, the operator had to manually close a damper on duct connected to the machine.
A PLC could do the same job if it knows when the machines are working.
I thought that you would use the fixed setpoints according to the number of working machines. You need to elaborate more this idea about pressure sensors.
No offense, but taking into account these many questions, I think you need to ask for local help. Working with an experienced specialist is the best approach for learning how to deal with integration projects.
Yes, thats the system : waste extraction system
Yes, that what i want do
Yes, fixed setpoints according to the number of working machines
I can resume them to 2 questions :
1) how to configure, programming Altivar61 in RSlogix 5000 ?
2) we can use Ethernet/IP for Altivar61/PLC communication, but, HMI accept Ethernet/IP or not? to ensure that the responsible can change frequency in some cases via it.
thank you for your answer Sir
Last edited:
jraef
Member
So all you are really asking is how to add in a Schneider drive to a Rockwell Logix PLC system using Ethernet/IP then?
Sounds as it you don't have a lot, or enough, experience with adding non-Rockwell devices to the system. There is a process to do it, it involves creating what's called a User Defined Profile (UDP). Overall, a device on an Ethernet/IP network must have a "profile" that tells the other devices on the network what it is and how it communicates. Rockwell devices all come with their own Add On Profile (AOP), as do many devices from their "Encompass Partners" who make products complimentary to Rockwell's product line. But when you want to add a "foreign" device, meaning a competitor to Rockwell, someone has to create this UDP for it to work. Information on how to do this should be available to you in your language from any number of local resources. In some cases, companies that make competitive equipment even publish their own documents describing the process of adding their devices to Logix, those are sometimes the best route, so I would start by contacting Schneider first and asking them. Once you have that profile loaded onto RSLogix, adding it into the program will be a lot easier. With communications established, you can simply load a speed command value into the drive based on whatever machine combination you select.
Personally, I think you have more problems than that with this concept, such as drive size and capacity, but you seem to be confident in the basic design and reluctant to share details so, good luck with it.
Sounds as it you don't have a lot, or enough, experience with adding non-Rockwell devices to the system. There is a process to do it, it involves creating what's called a User Defined Profile (UDP). Overall, a device on an Ethernet/IP network must have a "profile" that tells the other devices on the network what it is and how it communicates. Rockwell devices all come with their own Add On Profile (AOP), as do many devices from their "Encompass Partners" who make products complimentary to Rockwell's product line. But when you want to add a "foreign" device, meaning a competitor to Rockwell, someone has to create this UDP for it to work. Information on how to do this should be available to you in your language from any number of local resources. In some cases, companies that make competitive equipment even publish their own documents describing the process of adding their devices to Logix, those are sometimes the best route, so I would start by contacting Schneider first and asking them. Once you have that profile loaded onto RSLogix, adding it into the program will be a lot easier. With communications established, you can simply load a speed command value into the drive based on whatever machine combination you select.
Personally, I think you have more problems than that with this concept, such as drive size and capacity, but you seem to be confident in the basic design and reluctant to share details so, good luck with it.
If you put the PLC, VFD and HMI on the same ethernet network, your flow of data will be:
Code:
Start-Stop-Set Speed
HMI ----> PLC ----> VFD
Status
HMI <---- PLC <---- VFDEDIT:
The point is: the HMI doesn't need to read or write directly to the VFD. This way the PLC is in charge of control & safety.
Last edited:
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