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  1. Hello, I am having an issue with a PowerFlex 700S. This drive controls a travel motor for an overhead hoist. It is periodically not starting after stopping at a programmed point and sometimes stops while traveling to the next station. It does not give any faults or alarms. It is controlled remotely from a CompactLogix through a wireless router to an N-Tron unmanaged switch to the 20-COMM-E adapter. There are some limited manual controls, but the normal operation is a start, stop and speeds all sent from the controller. We have the DI6 set to enable and that does not seem to ever be lost. When this happens the only thing that I can find is the start inhibit parameter shows a bit 8 set high which is a start request present. I can see the PLC has already sent the start signal. I can put the machine in manual mode then cycle back to auto and the drive takes off. The only thing I can see changing while doing this is the start command is dropped and then sent again. I have changed the comm adapter as originally I had thought this was an issue with comms, but now I am skeptical as I have it set to fault and stop if a comms loss is detected. I am also able to connect to this drive and others on the same hoist through the wireless comms, so I feel better about the comms path. What causes this start inhibit bit 8 to become active? Does this seem to be a communication issue or a potentially a bad drive?
  2. Hello, I'm looking into getting into PLCs, I have worked on things like Arduinos and other electronics. In my line of work I keep coming across PLCs and I think it would be best if I knew more about them. So my friend and I are planning on doing a PLC based project but we are a bit stuck on deciding what PLC brand to purchase. For now we are looking into Automation Direct Productivity2000 series and IDEC MicroSmart Pentra.  We have very little experience with PLCs so the Automation Direct stuff looks tempting but I'm afraid of investing money and time into something that wont translate over to industrial standards (software, logic, etc...) I came across this site while researching PLCs and wanted to ask: With your hindsight and knowledge of the industry, what PLC would you pick for someone that is starting out and wants to a project that will help them gain knowledge of the industry?   Thank you for your time, Hector
  3. Greetings, We (in the steel industry) have many pumps / motors (large and small).  Generally we use soft-starts,  cross-line starters (E3+) or even Flex drives. There may be several motors in a pool to start where we need only say 2 of 3 to be running at any one time  When it's time to start them, we may need to stagger start them, if one fails, the spare may need to start.  My question to the group is... Are there any philosophies out there (and hopefully pseudo or actual code) as to how to start a subset of motors/pumps within a pool of motors and maintain the configuration running ? I appreciate any and all comments. David