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28th Nov 2022, 08:58 AM #1Senior Member
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Single phase input VFD to 3ph output on a lathe
Hi, I've just connected a new VFD to the 3ph 415v 2 speed motor of my lathe. Problem; The motor will now run up to full speed (2800) no problem, BUT only after I give the pully an initial push start. The VFD is a Nflixin single phase 240v input to 3ph 380v output. I've changed a few parameters in settings, eg. speed to 2800, acceleration time to 5 seconds, volts to 415 but nothing else. Motor is around 50 years old but seems to run very nicely once going.
Thankswoodworm.
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28th Nov 2022, 09:07 AM #2Senior Member
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Maybe it dosen’t like too much variance from the 50Hz it was designed for?
Unsure though as most people seem to rave on about how much range of speeds they can get from a vfd
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28th Nov 2022, 09:22 AM #3Most Valued Member
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are you sure you have 415v across all three phases at the motor terminals?
are you saying the motor is a 2 speed motor? and you have tried to configure accordingly to work from the VFD on both speeds?
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28th Nov 2022, 09:51 AM #4Golden Member
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Can you post a picture of the Data Plate on the motor?
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28th Nov 2022, 11:21 AM #5Pink 10EE owner
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I wonder if it is wired correctly. Sounds like one phase is not there.
Gold, the colour of choice for the discerning person.
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28th Nov 2022, 12:43 PM #6Senior Member
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I did check static and running but for some reason when running the voltage was jumping around too much for me to understand. Maybe my multimeter wasn't up to the task.
Measuring from motor terminals while running multimeter also kept flipping over to DC.
Yes 2 speed 700 and 2800 but haven't run it from the 700 side.
According to those with the same motor it can only be run on one speed.woodworm.
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28th Nov 2022, 12:45 PM #7Senior Member
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28th Nov 2022, 12:52 PM #8Senior Member
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28th Nov 2022, 01:07 PM #9Senior Member
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28th Nov 2022, 01:14 PM #10Senior Member
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28th Nov 2022, 01:15 PM #11DISCLAIMER
No liability is accepted by MetalWork Forum's administrators
or moderators for advice offered by members posting replies
or asking questions regarding electrical work.
We strongly advise contacting a Licensed Tradesperson for all electrical work.
WARNING
Information supplied within Electrical Posts is not to be considered as detailed formal instructions to complete a task.
Members following such information do so at their own risk.
Updated Nov 28 2022
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28th Nov 2022, 01:16 PM #12Senior Member
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The 3 phase motors I’ve seen run with a missing phase (when a phase was lost in the building) ran slowly and with obvious growling sounds.
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28th Nov 2022, 01:58 PM #13Golden Member
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How have you got it wired into the lathe switches? The VFD should have Phase Loss Protection so it would not run at all unless 3 phases were available.
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29th Nov 2022, 10:54 AM #14Most Valued Member
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I am guessing that 1 phase is missing. Wire direct to motor as you suggest.
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29th Nov 2022, 05:23 PM #15Senior Member
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I've now noticed that the motor will keep running even when frequency is turned down to around 3.5hz
woodworm.
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