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vfd

  1. General Electrical Discussion
    Greetings, Question about the CEC regarding VFD's. Im doing a sand blasting project. I have the following loads .77A 120Vac single phase gear motor, controlled across the line. .7A dc motor controlled by a 120Vac KB penta DC drive 100W powersupply for PLC,PLC in/out modules, and 3 input...
  2. PLCs, VFDs, Motors and Controls
    We have 4- 50hp drive controlled winch motors. The drive cabinets are in an exhaust drift in an underground mine, and are not in a controlled environment. Since install we have lost 6 drives- 2 because of the MOV jumpers, 1 because of contamination (those three were at commissioning), and the...
  3. PLCs, VFDs, Motors and Controls
    VFDs must create lots of harmonics on the power line since their output is non-sinusoidal or distorted sinusoidal. That being said, are supply wires for VFD pumps and motors typically larger than those for standard AC pumps and motors of the same horse power?
  4. New Member Introductions
    Hey folks, been looking around and it seems I can really get along here on the site. 2nd year controls electrician from Calgary, AB with Concept Elec. Finished the Telus Spark science center and paid my dues bending pipe and pulling wire. Spend my time bouncing from offices to multi-unit...
  5. NEC Code Forum
    For years in industrial facilities, we have been able to disconnect a motor back at the MCC (and use LOTO) for service. We usually do this when the motors are located in Electrically classified spaces. But also in pharmaceutical where the fewer boxes & conduits the better. We were recently...
  6. PLCs, VFDs, Motors and Controls
    what would happen if i run a motor that has a nameplate rating of 60hz and is on a vfd, to 65 or 70hz???
  7. PLCs, VFDs, Motors and Controls
    Manual at: http://www.delta.com.tw/product/em/drive/ac_motor/download/manual/VFD-B_manual_en.pdf I have a Delta Electornic VFD-B drive. I have the 3-wire Stop/Start and FWD/REV figuered out using NO for run,NC for stop and 3 position sl sw for FWD/REV just like the drawing on page 5-19. My...
  8. General Electrical Discussion
    I have come across a 3 phase, 5HP 208v well pump install that is acting up. When i showed up onsite the pump tech's were there and the VFD had just blew off the wall... i have done some low level meggering, it seems like some tests should be done, any thoughts.. I am not very skilled in...
  9. General Electrical Discussion
    Lenze-AC Tech the release of the NEMA 4X Terminal Cover with Speed Potentiometer. This Lenze-AC Tech product can replace most Hitachi Variable Frequency Drive models SJ200, L100 and L200 series products. In addition, the following AC Tech-Lenze SMV new HP Ratings are also availabe in NEMA 4X...
  10. PLCs, VFDs, Motors and Controls
    Hey.. I have a 0 to 10 V signal from a device which I would to control a VFD with. The problem is that I need it to work like this. 5V means stop From 5 to 10 V the motor runs one way ( 10V is full speed one way) From 5 to 0 V the motor runs the other way (0V is full speed the other eay)...
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