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I've setup an Omron NX102 PLC with two CIF105 cards communicating with about 40 MX2 VSD's (20 on each card). Generally it works pretty well. I used the attached document to set up the devices. The links on the document to the examples don't work, so I'm unsure if I missed anything. My problem is that every day, sometimes multiple times a day the communication seems to die. i.e I either loose the output to the VSD and nothing will run. Or it all runs but I loose the feedback, as in I get no running signal even though the drives are running causing a fault in my program. I'm at a bit of a loss as to what might be causing the issue. To resolve it, I put the PLC into program mode and back into run mode and everything is happy again. Has anyone had a similar issue or offer any advise? MX2_Control_Serial.pdf
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Freewheeling stop in Altivar71
engMoH posted a topic in Modicon / Telemecanique / Schneider Electric
i am using a VSD Altivar71 and controlling it through serial MODBUS communication, the probllem is sometimes after stoping the motor the drives gives the "nst" fault which means according to the programming catalouge "freewheel stop" it doesn't do that all the time but it happens a lot and after uploading the code again to plc the problem is gone for a while before it happens again. i am sure that the fault is happening because if communication because when i controll the drive from hmi it never gives that fault, i checked the setting and tried different cables but it still gives "nst" and motor never moves, i found that in catalouge but i am not sure how to address the problem.-
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- communication
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i have a plc Modicon M340 , HMI hmigxu3512x and VSD Altivar 71, and i only allowed to use serial MODBUS port in plc, now the VSD is a slave and is controlled with plc as a master how can i add the HMI to this configuration?? i know that this model of HMI can be slave but then how it will give orders to PLC to start stop etc.. and if PLC is slave how it will control the VSD??
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Hello, I need to Synchronize two 4kW motors connected to their own individual AltiVar VSDs. To put it simply the two motors are pulling cables on a pulley and when loaded the motor's slip and the speed varies. I have an Omron CP1L-EM PLC and 2x Omron Rotary Encoders ( E6C2-CWZ5B encoders - 360 PPR) - connected to each motor, What is the best way to read the pulses from the two rotary encoders then convert to RPM? 1) Using PRV or PRV2(883) instruction, - this would be the best option as it would convert the value to RPM - however, can I use this instruction on both Counter 0 & Counter 1? 2) Or read the raw value from Counter 0: A270 (connected to motor one's encoder) Counter 1: A272 (connected to motor two's encoder) Convert the pulses to RPM - then compare and adjust? 3) Or using CTBL. - is this a useful instruction for this application? Once I get the RPM speed from each motor - I can then do a compare instruction - see if there is a mismatch and if so send a scaled analogue output to the VSDs to correct the speed if required. (10-50Hz) What would be your recommendations? any help would be most helpful. Thank you.
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I connected between Altivar 71 VSD drive and Modicon M340 PLC through MODBUS RTU RS485 and the communication is ok, now i want write a command word using Write_var function to control the VSD but I find very confusing. first : it's written in cataloug that bits from 0 to 15 can be assigned to commands , is that done from HMI? i can't find anywhere on HMI. second : in the function (both read and write) obj element can be int or bool bit but the EMIS element in 'write_var' function (data going to VSD registers) only accepted if it's array of int not bool so i can't trigger the bits i want !! third : like the picture the VSD showing it's in NST mode and it says that it won't start until hex value of 6 written to command word but the catalogue says that only bit 0 is assigned(to forword command) and other 15 bits are free for user to assign and 6 in hex (0110) bit 1 and bit 2 still not assigned to any thing !! i hope anyone could help
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i have altivar 71 speed drive without graphic display, and plc modicon m340 with only ddi and ddo modules and no communication module, i want to control the altivar 71 from plc through serial modbus but i don't know how to do so is there any book i can read or place to get information from ? all catalogues only explaining the graphic display which i don't have, i only need to conrol the speed and start stop function no other parameters!!
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FR-DU04 (FR-A500) vs FR-DU04-1 (FR-V500). Programming unit differences. (A VSD question) What is the difference between these units? Why are they not interchangeable. (Other than the fact that the FR-DU04-1 is used for vector VSD applications, and the FR-DU04 is intended for standard induction motor applications. Is this a matter of firmware differences?
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Hi erveryone, i'm new to the world of plc but very eager to learn. i'm currently working on a project that requires a vacuum pump to be driven at 4 different speeds. The pump is hooked up to a VFD and what i was wondering is it possible to create ladder code to make DA1I send different 4-20mA signal to the VFD to get the different speeds? This is my first project and its probably a little over my head but i'm keen to give it a go. thanks