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Recent content by james64

  1. james64

    Transformer enclosure type for lift station

    Thank che12345, As far as I know, only Type 2 has louvers. Am I right? I will check the shop drawing. Thank FaceEngrPE, Will Type 2 be sufficient for a transformer installed indoors not outdoor installation. In addition, both the control panel and the electrical panel with driphood should...
  2. james64

    Transformer enclosure type for lift station

    Thank Waross, All equipment, including the control panel, electrical panel, and transformer, must be installed above ground level, not below grade. Thank che12345, Do you mean that the transformer will generate heat equivalent to approximately one percent of its capacity? Does 75kVA require a...
  3. james64

    Transformer enclosure type for lift station

    Hello, I am working on a small lift station(pumping storm) that requires a 75 kVA transformer. "Is a Transformer enclosure with a Type 2 driphood enclosure sufficient or should it be a NEMA 4 enclosure?"
  4. james64

    VFD blow up

    Thank you eeprom for your comment.
  5. james64

    VFD blow up

    Thank you wcaseyharman for your comment.
  6. james64

    VFD blow up

    Thank TugboatEng for your comment !! I am wondering if the overvoltage issue is a result of not having a line reactor between the AC incoming and VFD input. I am not sure how this overvoltage occurred.
  7. james64

    VFD blow up

    After checking the site, I noticed that the cable length would be around 50ft from the panel to VFD. The cable was inside a rigid conduit that was well-bonded to the ground. There has been an explosion on the AC incoming side of the VFD, causing the incoming circuit breaker to trip as well...
  8. james64

    VFD blow up

    Thank you for your tip, LittleInch. I will share your input with the relevant person as much as possible.
  9. james64

    VFD blow up

    Thank Waross,LittleInch,jraef and TugboatEng.. Thank you for your tips.If we plan to purchase a VFD, it's important to verify the vendor beforehand. We have already complained about the broken VFD, but they are insisting that we purchase a new one. Thank you for sharing the photos. I saw a...
  10. james64

    VFD blow up

    Thank SilverfoxUK for your comment, As far as I know, VSD is located near FAN and I will verify the distance of the cable. However, the fan has been operated on for a few months without a problem, this issue came out recently. I am skeptical that issues with the reason, harmonic, or fan...
  11. james64

    VFD blow up

    Thank Waross & LittleInch, I spoke with the contractor, who informed me that the VFD had broken into pieces with a loud bang on the floor. He remembered that the fan operated correctly for a few months. He also mentioned that he does not have any information regarding your concern. I plan to...
  12. james64

    VFD blow up

    Thank thebard3 and LittleInch, To thebard3, I agree with your comment. To LittleInch, After reviewing the shop drawing, I noticed that the specification lists two full-load currents. Please refer to the attached file for clarification. I am a little confused about which one I should consider it.
  13. james64

    VFD blow up

    Thank jraef for your comment. You mentioned that only a 10% success rate can be guaranteed for 600V, which indicates a high potential failure rate for the drive side.
  14. james64

    VFD blow up

    Thank TugboatEng and LittleInch, TugboatEng, I will contact the vendor. LittleInch, Wil more investigation about that. See below for your concerns. How is the VFD set up to start? => Can you please elaborate on this question? Ramp rate? => VFD units are factory set with acceleration and...
  15. james64

    VFD blow up

    During the starting process of the motor, the VFD has broken down.
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