Have you encountered a PowerFlex 753 drive that is receiving power but not providing output to the motor, without displaying any fault codes? The Human Interface Module (HIM) indicates that it is running at the correct speed and all systems are functioning properly.
Is the device instructed to operate at a speed of zero? And where is it configured to receive instructions for its operation and speed settings?
The device was instructed to operate at 60 hz, however, no voltage was being delivered to the motor. After consulting with RA, it was revealed that the IGBT had malfunctioned, causing the VFD to operate under the assumption that everything was functioning properly. Therefore, it is necessary to replace the entire unit.
I encountered a problem with my PF 753 drive where it had 640VAC in and "310VAC Out" but no actual voltage output. I suspected an IGBT issue, so I replaced the VFD. Upon dismantling the old VFD, I found the IGBT in pieces with burn marks. I ordered a new IGBT in an attempt to salvage the VFD, but even after installation, there was still no output voltage. This leads me to believe that the IGBT may not have been the only issue. When I commanded the motor to stop, the VFD decelerated to 0 Hz. However, when I tried to start it again, there was a sudden loss of power and a sound resembling a gunshot. I will reassess the situation when the maintenance lead returns from vacation, but I suspect I may have wasted several hundred dollars.
A 640VAC input translates to a 904VDC bus, which likely caused the transistors to fry.
There are 753s available that are capable of supporting input power up to 600VAC and 690VAC. It is hoped that this is the case.
In my experience with a PowerFlex 753 drive, I had a similar occurrence where everything seemed perfectly fine from the HIM standpoint, but there was no motor output. Strangely, there were no fault codes either. The issue turned out to be related to a loose control wire in the terminal block of the drive. The connection was hardly noticeable but fixing it solved the problem. I'd recommend thoroughly checking all wiring connections as a start. Good luck.
It sounds like you've checked the basics, so this might be a bit more complex. If everything is displaying as 'normal' on the HIM but you're not getting output, it could be an issue with the motor connection or the drive's output stage itself. It would be worth checking the connections between the drive and motor for any signs of damage or loose connections. Also, perform a static check on IGBT to make sure there're no Short Circuit or Open Circuit faults. If everything on the motor side seems fine, your issue might be inside the drive, which can be harder to diagnose and might need professional assistance.
In fact, this is a situation I've encountered before. The issue could be related to the control wiring, rather than the drive itself. It might be beneficial to double check if the wiring between the drive and the motor is properly connected and not damaged. Additionally, you could also verify that the parameters of the drive are correctly set according to the motor's specs. I've also experienced cases where a hidden internal fault in the drive was the root cause. Sometimes sensing and reporting systems aren't perfect, so don't rule out manual checks.
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Answer: Answer: There could be various reasons for this issue, such as internal drive faults, incorrect parameter settings, motor issues, or external factors affecting the drive's operation.
Answer: Answer: Troubleshooting steps may include checking parameter settings, inspecting motor connections, verifying wiring integrity, testing with a different motor, and consulting the drive's documentation for further guidance.
Answer: Answer: It is unusual for the HIM to display correct speed while the drive is not delivering output to the motor. This discrepancy may indicate a specific issue that needs to be investigated further.
Answer: Answer: Solutions may involve checking for loose connections, verifying parameter settings, performing a reset on the drive, inspecting the motor for faults, and consulting the user manual or contacting technical support for assistance.
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