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  1. dgauthier

    VFDs - Trouble restarting loaded conveyors

    Hello, all. Thanks for the response to my original post. You're a goldmine of information. FYI, the drives in question are A-B PowerFlex 70s. Reducing the accel rates per advice from A-B and others did help. Also, (according to AB) virtually any properly-configured drive should outperform...
  2. dgauthier

    Motor gearboxes...basic questions.

    Questions concering electric motor gearboxes... 1. Are there direct relationships between ratio, speed and torque? I just installed an electric drive. The torque spec on the basic drive (W/O gearbox)is given as 225 ft/lbs and the spec for the entire assembly is 2250. The gearbox is clearly...
  3. dgauthier

    Basic motor/drive questions...

    We use 460V 3ph squirrel-cage motors here, and I need to get up to speed regarding motor basics. I'm a controls guy with a heavy electronics background, well versed in basic ac/dc theory but little motor experience other than the control end. I don't speak calculus. 1. Is there a relationship...
  4. dgauthier

    Interference on T/C inputs to PLC

    In the old days, we used to have to attach a very small value electrolytic capacitor across noisy TC inputs. This was a stop-gap measure until the cable or other faulty component was identified and replaced. You will have to experiment with various values to get the right filtering. We've also...
  5. dgauthier

    Wireless MicroPLC

    mls1 - Sorry I can't give you the hands-on references you requested, but I considered wireless for an outdoor PLC link a while back and was sold on a company called Synetcom. Go to their website, www.synetcom.com to see if their products are what you're looking for. Regards, and good luck.
  6. dgauthier

    VFDs - Trouble restarting loaded conveyors

    Hello, all I'm a process control guy and I'm having to work with VFD-controlled motors more frequently lately. As an old boss used to say, "I'm not sure I understand all I know" about motors. I just built a PLC controlled panel for coordinated control of a conveyor line. VFDs were...

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