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  1. gcaudill

    Delta 3 Phase and VFD problems

    For what it's worth, I have used Baldor, ABB, AB, and Delta drives in a facility with both 230V and 460V, delta connected, ungrounded substations. I have used the said drives on both voltages. I have not had any drive failures related to the delta connected substation nor have I had to make...
  2. gcaudill

    SLC 5/05 Fault

    Are the inverters grounded via the enclosure sub-panel or is there a an actual ground conductor? In my opinion, all devices in an industrial control panel should never utilize the sub-panel or enclosure as the grounding path. To do so opens the door for common mode noise and stray voltages...
  3. gcaudill

    Rockwell icons

    you could probably get the icons from the original installation CD's. They usually have an icon file in the CD root directory.
  4. gcaudill

    Initial Power-up of an Electrical Enclosure

    In my startups I've found the most comforting action is to close and lock the panel doors, clear the room, and throw the big switch. Common sense checks prior to powering up should be done, of course.
  5. gcaudill

    Modbus vs. Modbus RTU

    Thanks djs for the clear answer.
  6. gcaudill

    Modbus vs. Modbus RTU

    I have two devices: Device #1 - Honeywell UDC3300 with Modbus RTU protocol Device #2 - Newport iSeries with Modbus protocol Are these two devices compatible on the same network? Is "Modbus RTU" different from "Modbus". Both use the RS-485 physical layer.
  7. gcaudill

    Network Voltage vs. Device Voltage

    Thanks rraghunath and kiribanda. Most helpful.
  8. gcaudill

    radio remotes for Class 1 Div 1 Zone 1

    I'm not exactly what you mean by handheld radio remote, but mayber Intermec, Symbol, or LXE has something. All three make I/S products for hazardous environments.
  9. gcaudill

    A/V multiplexor - Design Question

    You could use any brand of two-position, maintained, selecter switch with three contact blocks containg one Normally-Open and Normally-Closed contact per block. For appearance, mount the switch in a small and cheap enclosure available from the likes of Allied or Newark electronics. For cable...
  10. gcaudill

    ac motor control

    With a 30:1 gearbox the reflected inertia from the gearbox output shaft to the motor shaft will be very low. The load will most likely "wind down" very quickly if there is and amount of mechanical damping in the system on the load side. The motor stops producing torque as soon as the power is...
  11. gcaudill

    Network Voltage vs. Device Voltage

    I am currently designing an electrical distribution system for a plant to be built outside of the U.S.A.. The nominal network voltage is to be 380V/3/50. The motors and other devices being specified for the plant are 380/400/415V rated (basically IEC stuff). My question is this, would it be...
  12. gcaudill

    MVI56-MCM to UDC3300 communications

    DASKAT, yes it is a ProSoft card. The UDC3300 addresses of interest are the loop 1 and loop 2 present value, to start. I have the ProSoft and Rockwell generic examples for using the ProSoft card, I was hoping to find something more specific to the UDC3300 application.
  13. gcaudill

    Can PLC system do this?

    The PLC has timer functions, among many others. I'm certain it can handle this application. Via the I/O, you could interface nearly any external control system with the PLC. PLC manufactuers do offer touchscreen displays, but that starts to add considerable expense.
  14. gcaudill

    Can PLC system do this?

    If you are not measuring flow, no analog I/O will be required. Digital I/O is all that you need. To build your standard PLC you need: Rack Power Supply Processor 1 8-point digital input (I assume you need to start/stop the process, i.e. a switch of some type needs to interface with the PLC...
  15. gcaudill

    MicroLogix Modbus RTU to Chessel 5180V Recorder Problem

    The values from the Recorder may be in Hex, even when reading the Floating Point registers. Thus, going directly to the F8:0 register is not possible?
  16. gcaudill

    MVI56-MCM to UDC3300 communications

    Does anyone have any ladder logic they can share with me for communicating between an MVI56-MCM module in a ControLogix platform to Honeywell UDC3300 controllers (modbus).
  17. gcaudill

    4-20 mA Current Loop Isolation

    Isolation improves common mode noise rejection. Stay isolated if possible.
  18. gcaudill

    Help) Controllogix + MVI56-MCM

    I am using the MVI56-MCM as master to several Honeywell UDC3300 controllers. Do either of you have ladder logic that you could share with me that may help?
  19. gcaudill

    RSLinx Ethernet comm issues

    The bandwidth may not be a problem, the quality of service may. Maybe unsolicited messaging from the devices to RSLinx would solve the problem?
  20. gcaudill

    Communication over Buss Bar

    Prosoft also offers wireless radio communications, not just Ethernet protocol.

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