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Found 5 results

  1. How to connect + Program wire encoder

    Hi all, I am not a PLC expert but can find my way within the program and would like to develop much more. For work (We sell industrial bandsaws) we have purchased a Posital Fraba wire encoder, and we would like to hook it up to our Mitsubishi FX3G PLCs to measure at what height the saw bow of the bandsaw is at that moment. Unfortunately I have little experience with connecting these things, as other encoders used in our machines are pre-installed by our factory. Below is described what functions the wires have. What I thought was the following: Pin 1 goes to an input of the PLC Pin 2 goes to + (or 24V) Pin 3 doesn't go to "Ground" as they describe, but instead to - (or 0V), which is technically ground Pin 4 and 5 we don't use, correct me if I am wrong. The saw bow goes up and down only, and I thought we don't need to use these wires.   I connected it like this, connected wire 1 to X0 on PLC and just to test I made the program read:   M8000 ------------------------------ C235 k99999   But the value stays 0, whether I pull the wire or not. So something is wrong, but what, I really can't figure out. Hope someone can help!  
  2. Hi all, I am taking a Kubler draw wire encoder back to a 1734-VHSC24 and having a little bit of an issue with the rollover.  With the draw wire untouched the output value seems to be fluctuating over time and appears to be drifting backwards to the rollover value making our distance measurements completely useless.  Does anyone have any insight as to why that might be?
  3. Hi All, I am pretty new at electrical design for PLC control panels. We are a UL508A shop, so this is the code I refer to most. Something struck me as odd when I was trying to size wire for this control panel. UL508A 28.3.1 says this: The required size of the field wiring terminal shall not be less than 14 AWG (2.1 mm2) and shall be determined by: a) Calculating the required ampacity per 28.3.2 – 28.3.6; and b) Determining the minimum field wiring conductor size from Table 28.1 having a corresponding ampacity that is equal to or greater than the required ampacity from (a). How can the minimum wire size be #14 AWG? We use #16 AWG for wire to the PLC modules? Are we breaking code or is there something I am missing? Also, understanding code books can be difficult. Is there a website or place I can go to get a plain English translation? I feel like I will read a sentence over and over again to try to understand what they are saying, and feel like there's is a much easier way to say it than the way it is written. For example, "28.3.1 b" ……...what is it really saying?  
  4. hi all   good morning i having problem to change the wire colour  i not sure why the others drawing can be done but not this one.   appreciate help eplan - wire colour cannot change.elk
  5. Good afternoon Mr.PLC forum members.   We recently had a fuse blow on the wiring between a 1756-OF6CI analog out card and a control valve (which we have no feedback for - only the 0-100% output). Took a little longer to troubleshoot since we have no feedback and we also don't monitor individual channel status of the card. For input cards (1756-IF8H or IF16H), it's easy enough to use the under-range/over-range or broken wire signal to troubleshoot a blown fuse or bad connection, and activate an alarm. I have been told by our local consultant-technician that there is an equivalent monitoring bit for output cards. Reading the instruction manual for the 1756-I/O cards, the fault channel bits do not seem to have this type of function for the 1756-OF6CI. The fault bits only seem to look at the requested output values, and at the connection between card and PLC itself as far as I can tell.  Am I missing something?   thanks for your help