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29th Jul 2018, 03:57 PM #1Member
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Trouble getting old 3 Phase motor to run
Hi,
I am restoring an old drill press which has an inbuilt 3 phase motor.
There are only 3 leads which makes me believe it's a star connection.
The resistance between each of the wires is 17.4 ohms.
For a test, I connected it to a VFD, but it only hums and makes a sort of grinding noise, but does not turn.
I've swapped the cables around multiple times but the problem persists.
Anyone have an Idea what could be causing the problem?
Does there need to be some fuse or breaker?
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29th Jul 2018, 04:05 PM #2Golden Member
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What frequency have you got the VFD set to?
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29th Jul 2018, 04:23 PM #3Member: Blue and white apron brigade
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I agree the frequency may just be too low
Is the belt connected? if so remove the belt and try again.
The belt alone could be enough to prevent a is 415V motor starting under 240V 3P.
BTW 3 wires means it could still be a delta motor.
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29th Jul 2018, 04:47 PM #4Golden Member
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When I set up a new Chinese VFD on my surface grinder I did not check the Maximum Frequency setting because I was in a hurry to see it go for the first time, the motor just sat there making funny noises until I realized that the drive was set to 400Hz, after resetting to around 60Hz it started and ran perfectly.
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29th Jul 2018, 06:03 PM #5Member: Blue and white apron brigade
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When connected to a 50Hz motor a Huanyang VFD with a 10s acc time and a 400Hz max will start the motor but switch it off at about 200Hz and report an error.
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29th Jul 2018, 08:46 PM #6Member
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The motor stator had a stamp 40-60 Hz 415v.
How can I check the frequency which my VFD is running off (currently turning the little pot gives values from approximately 0-60)?
A different motor will run just fine from the same VFD.
This drill press is geared, where the entire motor is built into the casting and can be removed.
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29th Jul 2018, 09:41 PM #7
Hi Mlo18,
I think that you need to carefully, physically check the motor windings for any damage ! Better yet take it to a motor re-winder and let them cast an eye over it.Best Regards:
Baron J.
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29th Jul 2018, 09:43 PM #8Golden Member
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Is your motor two speed? How many horsepower? What size drive?
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29th Jul 2018, 09:56 PM #9Member
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This is the VFD i currently have from ebay: 1,5 KW 3 Phase VFD 220V
I am not aware of what the HP of the motor is. I will check if the manufacturer of the drill press put the information somewhere.
I was able to completely remove the stator, I did not see any damage, it looked very good.
Bear with me, I am still learning.
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29th Jul 2018, 10:00 PM #10Member: Blue and white apron brigade
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Are you connecting the VFD direct to the motor.
If you have any sort of switch like contactor in the way this is A) not good for the VFD and B) will not work
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29th Jul 2018, 11:55 PM #11Member
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30th Jul 2018, 12:42 AM #12Member: Blue and white apron brigade
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31st Jul 2018, 12:15 AM #13Intermediate Member
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I suspect you have a 415 volt motor in its current setup, It maybe possible to change but expect some work. The load from the gear train might be enough to stop it when you are feeding it 220v 3phase.
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31st Jul 2018, 02:43 PM #14Member
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The motor spins freely even with the gear setup. I have removed all the gears, the motor makes vibrating noises and is hard to turn by hand when the VFD is switched on.
On one side the motor is easier to turn, then had a sudden jump before stopping again (wrong phases connected?).
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31st Jul 2018, 03:27 PM #15Member: Blue and white apron brigade
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