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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...

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...

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?"

Thank you eeprom for your comment.

Thank you wcaseyharman for your comment.

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.

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...

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

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...

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...

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...

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.

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.

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...

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

Hi all, I am experiencing a problem with a VFD that seems to be getting damaged when the motor starts. The overcurrent protection of the VFD is set to around 70A, while the motor has a full load current of approximately 80A, 600V, 3-phase at FLA. I am wondering whether the issue may be caused...

Thank both waross and che12345. My concern is what is appropriate transformer impedance for reducing fault current preventing trip panel branch breakers. To be honest I am not quite sure. What kind of fault should be applied for this calculation ?

Thank Che Kuan for your question. See below I agree with fault current kA, load current shall be A. 1. Your upstream breaker is 400 A and system is (600 V ?) Note: 600 V is not widely used. A) This voltage is used in Canada. 2. Why your client wishes to increase the "fault current"? Does he...

Thank you for your comment, Waross. I'm curious about the source of the 2.82% mentioned.

Hi all, I am experiencing an issue with a low-fault current panel X that is connected to an upstream feeder breaker with a capacity of 600V/400A. The client wishes to increase the fault current in the current panel X, but replacing the panel is a challenging task. To resolve the issue, we have...