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  1. jwmccoype

    ControLogix and Multilin SR469 Relay

    Hello OhioAviator, You've got lots of options, but they will each probably involve adding a specialty module to your ControlLogix rack. Have a look at http://www.prosoft-technology.com I think they'll have a module for just about any the protocols available on your Multilin. The only module I...
  2. jwmccoype

    Problem with delta to wye VT's on HRG system

    Guys, Thanks for the great discussion. I'm going to print all of this out and sit down with our team to figure out how to best apply it to our situation. John
  3. jwmccoype

    Problem with delta to wye VT's on HRG system

    TestBeforeTouch, thanks for your post. Good to know someone else has been in a situation similar to ours. We don't feel quite as crazy for trying the delta-wye connection now. What was your final solution? As for applying 480V to a 208V VT, another member of the team convinced me that a voltage...
  4. jwmccoype

    Problem with delta to wye VT's on HRG system

    Thanks for all of the good info, davidbeach. Like I said in the beginning, the relay is designed to be connected directly without VT's, for systems up to 480 V. Do you think I have any chance of making this work with the three phase voltages connected directly to the relay (through fuses, of...
  5. jwmccoype

    Problem with delta to wye VT's on HRG system

    Hello davidbeach, The original open delta VT's are gone. Three new ones were installed, but their primaries are connected in "full" delta with their secondaries connected in wye. All of this was done to derive a "usable" neutral. With that clarification, please expound a bit on what we should...
  6. jwmccoype

    Problem with delta to wye VT's on HRG system

    I'm involved with the replacement of the diesel genset on a 480V high resistance ground system. As part of the project, a Schweitzer SEL-547 distributed generator interconnection relay is replacing several individual relays protecting the utility interconnection breaker. The OLD relays were all...
  7. jwmccoype

    DCS Delta V connect via Modbus Ethernet Modicon Premium PLCs

    Lantronix has a device called the UDS10-IAP we have used with good success. However, we've had the Modbus master on the ethernet side, and the slaves on the serial side. Sounds like you may have the opposite case, and I'm not sure if it's applicable there. One thing we've done in the...
  8. jwmccoype

    UPS for PLC

    APC has alittle-known industrial product called the SP500DR, which mounts on a DIN rail and has screw terminals for input and output power. Unfortunately, it has an RS-232 port that works with their PC software instead of a status contact. We have connected a 120V relay coil in parallel with...
  9. jwmccoype

    SLC 500

    I think you're saying that you don't have feedback signals for air flow and fuel flow, but are individually controlling both of these actuators from the output of a single PID loop. Often, this is done with a single output (called "firing rate") from the controller, and the fuel and...
  10. jwmccoype

    Load Shedding Scheme

    Thanks, everyone, for your responses. One thing that seems to be unique is that our load-shedding objective is mainly to protect the client financially, not necessarily to protect the system physically. (Of course there's lots of relaying, outside my scope, for that). Although, an undefrequency...
  11. jwmccoype

    Load Shedding Scheme

    tomatge, We are working on a system similar to what you describe, but on a smaller scale. We have a client who will have their own generation on site and will be paralleled with the local utility. They plan to import from the utility a certain amount and generate the rest to meet their campus...

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