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Recent content by thekman

  1. thekman

    UPS for motor load

    ScottyUK, my first response was to put VFDs in, all I heard was 'they don't want to'. I don't think they have much of a choice.
  2. thekman

    UPS for motor load

    Mashup = UPS + DOL motor I take it. Worst part is they are 1ph motors, so they basically need new units. Luckily they're just around the corner...where the Atlantic ocean and Africa are the corner.... in the middle east.
  3. thekman

    UPS for motor load

    2HP hyd pump motor 230v 1phase. FLA 10A, reported inrush 53-63A. Customer wants a UPS on it - I found a 4kVA inverter rated for 12kVA surge for 20s. The ~14kVA inrush lasts only a second or so. I've been going back and forth with the mfr about it, he thinks it will burn out 'prematurely' and...
  4. thekman

    433MHz transmission

    IRStuff - my transmitters are powered by either 2 AA's or 1 9v battery. The only 'hole' in the box I'm testing with is the compressed gasket and whatever gap is created by me squashing the wires coming out....3 or more 18awg or smaller....when I close the hinged lid. Thanks for the replies...
  5. thekman

    433MHz transmission

    I use a simple contact sensor with an RF transmitter to fire a relay output on the receiver up to 40' away. This receiver is enclosed in a steel box with little or no air gaps, usually a NEMA 4. It seems to work ok with an antenna wire run out through a small hole in the box. I've been looking...
  6. thekman

    fieldbus control

    As I understand it, the servo may be controlled by the drive - (forward, backwards, stop), read/write parameters and get fault status and position, via "fieldbus" between the drive and a controller. Finding the right controller to accomplish this, then how to accomplish this, is where I am. I...
  7. thekman

    fieldbus control

    Can anyone point me to a succinct explanation of where to begin in choosing a means of commanding a servo drive via fieldbus (with no fieldbus experience), from a PLC or similar? I understand there is a command protocol used by the drive that may be communicated via fieldbus, which I should be...
  8. thekman

    115v motor actuator drive

    Ya, I've got the Invertek data sheet, Anacon is a vendor here in Texas. Thanks, I'll definitely look at those too.
  9. thekman

    115v motor actuator drive

    I found another mfr of singlephase motor drives....they seem much more informed and have more reasonable current ratings...just wanted to share.. http://anaconsystems.com/single-phase/
  10. thekman

    115v motor actuator drive

    Jraef, I did notice that right away, and asked the mfr what type of motor it is and he told me PSC. Additionally, it says in the manual that for reversing, the capacitor must "be disconnected". I haven't gotten my hands on it yet, but am pretty sure I can get into it and disconnect it. I'm...
  11. thekman

    115v motor actuator drive

    A motor with a built in VFD?? Have not seen that! The drive isn't the space killer, it's the actuator configuration using a 3ph motor...mechanical limits, always mechanical limits!
  12. thekman

    115v motor actuator drive

    Would love to! Not an option. Plenty of 3ph actuators out there but won't fit in space we have. Looks like we're going to switch to a DC Motor. Kind of hard to believe Leeson is the one and only company that makes such a drive. What's the big deal?
  13. thekman

    115v motor actuator drive

    I need to control a 1/2HP 115v motor...nothing fancy, just want to accel and decel - repeatably. I'm driving a 1500# load with an actuator (Duff Norton SPA6420). I found the perfect drive, a Leeson 175322. I need it in 3 weeks, I can't get it for 10. After scouring the WWW on and off for 3...
  14. thekman

    reversing motor wiring

    WIRING FOR MOTOR - ADDITION TO PREVIOUS POSThttp://files.engineering.com/getfile.aspx?folder=fbc78bc6-426b-4ff8-b2ce-29ae4ee73971&file=wiringdiagram.JPG
  15. thekman

    reversing motor wiring

    I'm getting no help from the motor mfr...and have not seen this before, so forgive me if it's common, but I have a customer who has wired a singlephase motor as shown in this diagram using reversing contactors, and has told me that "it works". I'll have to attach the motor wiring from the data...
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