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Recent content by fangas

  1. fangas

    Using proximity sensors to detect rotational direction

    Physically mount the switches so they switch 90 degrees apart. This will give you a quadrature output. then refer to the card module instructions to configure it. Ed
  2. fangas

    Overspeeding AC drive/motor

    Long discussion on this thread http://www.eng-tips.com/viewthread.cfm?qid=247210">Electric motors, generators & controls engineering - Maximum speed a motor can be run at</a> Good description at http://www.powerqualityanddrives.com/torque_constant_horsepower/ Ed
  3. fangas

    led to M12

    Cordset to: http://www.turck-usa.com/Products/Connectivity/eurofast/Field_Wireables/eurofast_Field_Wireables_Standard_with_LEDs.htm Then a cap, for protection. Probably look ugly. It's a place to start
  4. fangas

    Basic advice to control a Delta VFD-B for automated run-in cycle

    I agree with SReid on temperature shutdown. Especially if you're sorta new to this stuff, and have a limited budget. Measuring current & voltage out of a drive can't be done using conventional methods. You'll need some true RMS measuring. And that can get expensive. The easiest way would be to...
  5. fangas

    Basic advice to control a Delta VFD-B for automated run-in cycle

    Since you haven't done this before, I'd like to ask a few questions. 1). What is the purpose of this run-in ? Do you want to see if these motors will function for 8 hrs without self-destruction? Or ? 2). Will the run-in involve loaded or unloaded motors? 3). What temperature are you concerned...
  6. fangas

    RC Series Circuit

    There isn't, perhaps, a built-in freewheeling diode, is there? Ed
  7. fangas

    mains voltage sensing

    I've used these in similar applications http://www.crmagnetics.com/2550.pdf Ed
  8. fangas

    VFD removal

    To Calculate the speed of a induction motor, apply this formula: rpm = (120 x F)/P rpm = synchronous revolutions per minute. 120 = constant F = supply frequency (in cycles/sec) P = number of motor winding poles So, the synchronous speed of a 4-pole motor is...
  9. fangas

    Relays - AC vs DC specs

    E-stopping a servo by shutting down the supply is (was) used to be pretty common with FANUC. Here is FANUC's E-stop setup. In the description, the term "Magnetic" is used on Page 3/5 around line 50. My recollection is that "Magnetic" is FANUC's term for Contactor. It's been awhile seen I...
  10. fangas

    IR temp Sensor

    Raytek XR IR, with 485 to 232 adapter kit http://www.raytek.com/Raytek/en-r0/ProductsAndAccessories/InfraredPointSensors/ThermalertSeries/Raytek+XR/GP+Datasheets.htm Ed
  11. fangas

    Dynamometer in thinking stage- VFD or DC drive

    When I was working for a major motor Mfg. I got very involved in setting up an engineering / preproduction motor testing lab. It had 4 cells. Two were wrapped around a DC based dyno and the others around AC. The DC's were 1800 RPM machines that utilized field weakening to get to 2-pole AC...
  12. fangas

    electronic clutch?

    This looks sorta like a language (nomenclature) problem. If I'm remembering correctly, FANUC called this an "Abnormal Current In Servo" alarm. the machine tool maker can call it anything he wishes though. Basically it means that the servo is exceeding it's current limit, and the drive is...
  13. fangas

    E-Stop on machinery

    Questions to ask consultant. 1) This machine is eating itself. How far away do you think an E-Stop should be? 2) This machine is eating *you*. How far away do you think an E-stop should be? Ed
  14. fangas

    Use of series relays for HV DC safety isolation

    karl, That 2 X might very well be for 2 parallel contacts. It was early and I was between the 1st & 2nd cup. Another area you might look at would be the A-B Bulletin 100S-D IEC Safety Contactors. they actually spec a standoff of 1 kV. Series a couple contact sets, and you'll have a lot of...
  15. fangas

    Use of series relays for HV DC safety isolation

    Karl, Just to further complicate matters, I just took a look at the Schaltbau relay you referenced, and I very much doubt (but could be wrong) that the Aux contacts are not of the "Force Guided" type. If they are not, they probably aren't suitable as MPCE monitor contacts. However, you might...
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