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  • Users: gcaudill
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  1. 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.
  2. 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...
  3. 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).
  4. gcaudill

    The worst of VFD's

    Does anyone have any real life experience with VFD's that are bad in terms of dv/dt switching, and that are paticularly hard on motors. I ask because I am looking for a drive to test inverter duty magnet wire for inverter rated motors. The drive should be 575V and available in the USA. In the...
  5. gcaudill

    Frequency Output and ControlLogix

    Does anyone know of a frequency output module fro the ControlLogix platform?
  6. gcaudill

    ATEX Zone 1,2 equipment in NFPA Class 1, Div.2

    Would anyone on this board feel uncomfortable using an ATEX Zone 1 and Zone 2 approved tethered (wired) barcode scanner in a North American Class I, Division 2 classified area?
  7. gcaudill

    Power Factor Capacitor Controller

    I need help identifying and finding documentation on a power factor correction controller. It is marked with the following: "GEC Measurements" and "NOVAR 200" Model # NV26S6D002 Serial # 26338W Wiring Diagram # TT9022 Does anyone recognize this controller? Where can I find a user's manual...
  8. gcaudill

    Drivers to make OPC Server <---> PLC2

    Does anyone know of any software that can communicate with Allen Bradley PLC2 compatible devices and work as an OPC server?
  9. gcaudill

    SLC500<-->Anafaze Controller Comms using RS-485

    I have six Anafaze 8LS controllers I want to communicate with from my SLC500 5/05 RS-232 port using an RS-232/RS-485 converter. Has anyone ever done this? Any tips?
  10. gcaudill

    Operating Induction Motor at Reduced Speed

    Anyone care to guess, or have some tool, to estimate the temperature rise that will result from operating a non-inverter rated induction motor at less than base speed from an inverter supply? I have: 5HP motor, 1750RPM, 184T frame, 230V/3/60, 87.5% Eff (at full load), NEMA design B, open drip...
  11. gcaudill

    Does 430.28 Apply?

    I want to install a subpanel off of an existing panel. The subpanel will feed three combination loads. The existing panel is fed by 3-350mcm feeders per phase. The tap conductors will be 2-250mcm cables per phase, and will be bolted to the existing panel bus bars. The subpanel will be...
  12. gcaudill

    C++ timing question

    I am using Borland C++ v.4.51. I want to execute something every 0.10 sec. How can I use the "data_time.ti_hund" command to do this. Does this command count in 0.010 (0-99 to the machine) second intervals? I have tried: hund_time = data_time.ti_hund; if (hund_time==1)...
  13. gcaudill

    MS Project 98 SR-1 & Windows 2000 Problem

    I am running Microsoft Project 98 SR-1 on Windows 2000. When I try to do a "Save as" from the File menu I get an error message instead of the "Save as" dialog box. The error message is: "There is not enough memory to display the Save dialog box." In the error...
  14. gcaudill

    "Save as" from the File menu error message

    I am running Microsoft Project 98 SR-1 on Windows 2000. When I try to do a "Save as" from the File menu I get an error message instead of the "Save as" dialog box. The error message is: "There is not enough memory to display the Save dialog box." In the error...
  15. gcaudill

    Unbalanced Three Phase Load

    I have an electrical system which consists of a delta-wye connected transformer supplying a delta connected load. One corner of the delta is grounded. I have the following load current measurements: I leg1 = 1115A I leg2 = 1000A I leg3 = 1092A Can someone tell me where the unbalanced current...
  16. gcaudill

    Allen Bradley 1784-PCMK Card

    I have tried nearly every Board Address setting in the RSLinx 1784-PCMK device configuration dialog box and all of them seem to conflict with other addresses used by the computer. Also, no matter what I set the Board Address to, when I reboot the Board Address always goes back to EC00. PC...
  17. gcaudill

    Mutual Inductance To Blame?

    I have an application where (10) 350mcm cables are arranged on 1" centers in an open wire tray. All 10 cables carry one phase of a three phase delta connected load. The total phase current is 2200A. When I measure the current on the individual conductors I get readings of 150A on the...
  18. gcaudill

    GE Reactrol

    Does anyone know where I can get information on General Electric Reactrol controllers?

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