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About drforsythe

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  • Location Metro Detroit Area, Michigan
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  1. Good call, Joe.  That is common especially in plants with unstable or uneven flooring.  In our plant, a forklift driving by can shift the concrete slabs when it drives over them.  Way back when the building was erected, the contractor was pressured to rush on the concrete installation.  The quick-cure and poor base prep caused some slabs to curl on the corners causing a slight "dishing" in the center of the slabs.  We have to shim the enclosures in some areas to keep them level.  
  2. Does it look like the enclosure was dropped?  How were the holes cut in it (manually using hand tools or boring mill, radial drill, etc.)?  If it was dropped, the hinge or area where the hinge is welded could be damaged.  If someone cut the enclosure on a boring mill, for example, the tool could have crashed the door causing distortion.  Another place it could have been damaged is the fold around the doors.  If they are distorted, they will rub on the door opening.  Regardless, you will need to inspect for the location of the damage and then "help it back into position".  A large enclosure like that typically takes a lot to distort it.  It will take an equal force to move it back.  I have had to use a large mallet in the past to move a door back that was hit by a forklift.  Good luck.
  3. Universal Analog Input Card

    That usually means that the card can take multiple types of analog inputs.  For example, it could take +/- 10VDC, 0-10VDC, 0-20mA, 4-20mA, thermocouple (multiple styles) or RTD.  The card would usually have some hardware configuration (different terminals to select the type of input) and software configuration for scaling.
  4. CNS PUCC11

    The pictures and print are helpful to determine what you have, but I am not going to be able to help you with software.  I may be able to guide you in the right direction to get an expert involved, though. The first picture you show is listed as "CNS" on the diagram.  When looking at the NOTES section, "MELTAS" is listed in ().  I think this should be "MELDAS" which is an acronym for Mitsubishi's CNC (computerized numerical control) division.  I cannot remember what MELDAS means, but it references the CNC division.  The PLC is referenced as "MELCEC" which (if memory serves me) stands for Mitsubishi Electric Logical Sequential Electronic Controller.  The CNC division has technical support in the Chicago, Illinois, USA area, but that will not help you in Vietnam.  I would try to find a local technician that services Mitsubishi CNC machines.  They should be able to guide you in the right direction. Best of luck.  
  5. CNS PUCC11

    I searched for all of the numbers I see at the top of the cards in the picture and was not able to find anything.  That doesn't look familiar to me from a Mitsubishi perspective.  The oldest Mitsu controller I saw was a K Series.  I thought those had tan plastic covers, though. I did notice that the key in the PUCX11 says "idec" on it.  Have you checked with Idec to see if they know of it? What type of machine is this on? Do you have any other information (electrical print showing complete part numbers or pictures of the side of the unit where a manufacturer tag may be? Now I am curious and want to know what it is. Good luck on your search.  Please keep us posted on your progress.
  6. Control Panel Builder

    Welcome to the forum.  Please include some more details about yourself, your specific experience building panels and if you have pics that would be great.  Where are you located?
  7. network parameter fo A3A cpu

    I spent some time this morning looking at your program, but I cannot easily determine the mapping of the network devices to the internal memory devices of the PLC.  It would take some time to study the prints, the physical layout of the machine and the program in order to determine the network map.  That is something I could not do in the time I spent this morning.  I would recommend contacting the original machine builder or contact a Mitsubishi office and ask for someone who is familiar with the A series PLC.  I worked on stuff like this over 20 years ago.  The product has long ago been replaced by new PLCs, networks and software to program it all.  I am sorry I cannot help you.  Best of luck in your search.  
  8. network parameter fo A3A cpu

    Attach it to this thread.  I will do my best.  It has been many years...  
  9. Hello.  This topic is not controls-related, but I think I could learn something from the group.  In addition to being an electrical controls engineer, I am a medical first responder for the plant I work in.  It has been suggested that all first responders be easily identifiable by the plant and office staff in case of an emergency.  This request could easily get out of hand- nobody wants to wear a bright green t-shirt to work every day or a hard hat with strobe and light.  My question is this:  Do the first aid response personnel in your places of employment wear or carry anything that helps to identify their role?  If so, please share your experiences and images if you have any.  Silly or comical images are definitely accepted, as they may help to demonstrate what we DON'T want to do.  Thank you and stay healthy and safe!
  10. network parameter fo A3A cpu

    That is a good start, but it doesn't state which device(s) are used in the address ranges.  For instance, Melsecnet/mini can be tagged to X, Y, M, D... devices.  Your program should help us determine what devices were used.  
  11. network parameter fo A3A cpu

    I used to work for a company that sold Mitsubishi 20+ years ago and would have to regularly talk my customers through the setup of their Melsecnet networks.  They would upload a program using Medoc from a PLC that was configured with a GPP unit.  The GPP had tables to fill out for the network settings, but Medoc did not.  When they would download back to the PLC CPU, the network settings would be missing. All that being said, the biggest challenge was knowing what memory areas to read from and write to when setting up the mapping the physical inputs and outputs.  Some customers had well-documented prints that showed the real-world I/O and how it related to the virtual I/O.  Others were not so easy, and we would need to study their code for clues.  Do you have any such info?  Do your electrical prints have the information?  Or is your program documented to show which memory locations were used?  
  12. Starting my career

    If you can get a job in maintenance while you are working on your degree, it will show your employer and other potential employers you can manage work and school at the same time.  It can also show them you are willing to start in a position that will help you be a better engineer.  It will also give you a great perspective from the maintenance side of things.  Sometimes the biggest challenge is getting your foot in the door.  If you are a dedicated, intelligent, hard working person who is not afraid to take on new things, it will get noticed.  The big thing that could hinder you is if travel is an absolute requirement of the job.  Best of luck to you.
  13. How to make analog signal more stable?

    I am not familiar with your controller, but I would use an averaging, or filter command to reduce the fluctuations.  How much is the 0-10V signal changing?  Looking at your graph, the values on the Y-axis are only changing from a min of 73.07 to a max of 74.2.  That is a difference of 1.13.  That is if I read the scaling correctly.  I am not sure what units the X-Axis units are or how those values correspond to a 0-10V signal.
  14. 1756-EN2F

    Is it possible that the Dell managed switch is only allowing traffic from the original MAC address and not the new one?  
  15. Am I correct in reading that the system will repeat itself " until input X1 has been turned off" ?  If that is the case, then X1 would need to stay on for the entire time in order to set the output.  The sequence would abort and reset if X1 goes off at any time.  Or am I misunderstanding the requirement?