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Thread: VSD connection help
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4th Jul 2020, 10:52 PM #1future machinist
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VSD connection help
I'm trying to figure out how to hook up this motor too a VSD. What's confusing me is it has 9 leads UVW U1V1W1 and XYZ. If anyone can help ,Thanks in advance guys
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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5th Jul 2020, 09:12 AM #2Member: Blue and white apron brigade
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It's right there in the circuit diagram.
Basically U1 is paired with X, V2 is paired with Y and W1 is paired with Z on one set of terminals and
RST are connected to U, V and W on the other set of terminals,
RST are the 3 phase cables from the VFD
sd1.jpg
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5th Jul 2020, 09:38 AM #3Most Valued Member
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Hi bob,
Thanks for the zoom, cant do that easily on this pc.
So for 220V its series star and 440V parallel star? am I reading that right?
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5th Jul 2020, 10:13 AM #4Member: Blue and white apron brigade
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5th Jul 2020, 11:14 AM #5future machinist
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Thanks Bob I will give it a go. It's strange being a star wound motor.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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5th Jul 2020, 12:18 PM #6Member: Blue and white apron brigade
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It has two separate sets of coils and reminds me of a two speed motor.
Is your coolant pump SP or 3P.
Cheers
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5th Jul 2020, 12:41 PM #7future machinist
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The coolant pump is three Phase. I'm still not 100% how to move the flexible cables. at the moment it's 440v. But I'm thinking.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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5th Jul 2020, 02:49 PM #8Member: Blue and white apron brigade
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Are you hoping to run it from the same VFD as the motor?
If so this has a couple of potential issues.
Each motor is supposed to be permanently connected to its own VFD because its the VFD that is supposed to turn the motors on and off.
You can run both motors from the same VFD semi-safely if they are are permanent connected in parallel to the VFD power so the VFD always switched both on and off at the same time.
I say semi safely because the VFD will need to be set up to provide current over protection for the bigger motor.
BUT
if something jams in the (smaller) coolant pump it will not be protected and it could be damaged. Unlikely but it could happen.
Switches between the VFD and main motor are not advised especially if the main motor is heavily loaded and the its switch is turned off.
However, if the main motor is permanently wired to the VFD, a parallel power arm and switch could be setup between the VFD and pump. This means the pump will not work unless the main motor/VFD is running.
Another solution is to forget the coolant pump and go for a misting system
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5th Jul 2020, 02:56 PM #9future machinist
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The coolant pump is a seperate unit and I will be using its own VSD. At the moment I'm just still trying to get the spindle motor hooked up. The side with two connectors is marked W and Z the one with one is marked W this is where the power came in.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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5th Jul 2020, 04:18 PM #10Most Valued Member
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I assume those white pieces of tap are labels. If you can make out the letters/numbers can you label them as I sure cant make them out from your photo. Well apart from the W . If you cant make them out you're going to have to work it out.
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5th Jul 2020, 04:34 PM #11Most Valued Member
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p.s. I wouldn't be moving any wires or even taking more nuts off until you have labels. working out what goes where if you mix them up could be tricky.
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5th Jul 2020, 08:31 PM #12
Hi Guys,
Wouldn't just be more convenient to put a tap on the output of the pump ?Best Regards:
Baron J.
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7th Jul 2020, 03:01 PM #13New Member
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8th Jul 2020, 10:52 AM #14future machinist
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Well I got it going. I had another look at the terminal box. And despite it saying in 4 places on the machine it was wired for 400v. The motor was infact be already configured to 220. Just hooked the VSD straight up and was in business grinding drills. Will post a thread over in the other forum. When I fully figure out the machine.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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8th Jul 2020, 11:49 AM #15Most Valued Member
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Well of course it was and it was staring us in the face we just missed it
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