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Thread: 3p -3p 2hp vfd
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7th Oct 2016, 10:11 PM #1Member: Blue and white apron brigade
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3p -3p 2hp vfd
The men's shed has a 3P Nolex 12" RAS which takes around 3 minutes to come to a stop when turned off. During this time it is very quiet and in the general hum-drum of shed activities it is impossible to hear that it is still running.
I have looked at fitting a mechanical brake but there is nowhere to get any mechanical purchase so I though a VFD might be the way to.
The motor is 415V ∆ and to save stuffing around with the motor I though a 415-415V 3P VFD with a built in braking circuit would be the way to go.
I have looked around and these $215 senseless Vector drive units have come up on eBay.
Variable Speed Drive VSD VFD 1 5 KW 415V 3 Phase IN 3 Phase OUT | eBay
They have a AUS presence
MJB Controls Pty Ltd Unit 25/205-213 Port Hacking Rd Miranda NSW Australia 2228
Variable Frequency Drives / Variable Speed Drives | MJB Controls
133 page manual seems pretty good
Does anyone know anything about them?
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8th Oct 2016, 10:12 AM #2Senior Member
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Can't speak specifically about that one Bob but don't all VFD's have the ability to brake the motors these days ?
Looking at the manual for that one
http://mjbcontrols.com.au/sites/file...ser_Manual.pdf
Pg 62 PDF / Pg number 59 - P0-17 Dec Time 1
- this should be for setting the time
Pg 64 PDF / Pg number 61 - P1-05 Stop mode selection
- this should set the braking mode
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8th Oct 2016, 10:22 AM #3Member: Blue and white apron brigade
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Well yes and no, some have the beginnings of a braking system but have some chip missing from the boards. Jhovel has successfully added the chips to some of his SP-3P Huanyangs but I was hoping to avoid doing that. Maybe the 3P-3P Huanyangs already have the braking chips in them but the manual doesn't indicate this one way or the other.
I have also found the GT series Huanyangs are Vector control, 3P-3P, and according to the manual have a built inbraking circuit.
GT series inverters <15kW (380V) are equipped with internal braking unit.Inorder to dissipate the regenerative energy generated by dynamic braking, thebraking resistor should be installed at (+) and PR terminals.
Pricing seems reasonable
eg https://www.aliexpress.com/item/Huan...00023.5.H22cPC
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8th Oct 2016, 06:23 PM #4
Bob,
I can see the P+ terminal next to the PR connector in the bottom row. Same as the single phase Huanyangs. Their manual proudly states they have a built-in braking circuit .....Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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8th Oct 2016, 10:41 PM #5Member: Blue and white apron brigade
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9th Oct 2016, 02:23 AM #6
Yes, it is Bob. Some single phase manuals call them PR and N, P and N, another one PR and +..... the actual labels on all mine are PR and P+
go figure....Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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9th Oct 2016, 11:04 AM #7Most Valued Member
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Not exactly what you asked but would it be possible to just switch the motor to a resistor bank?
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9th Oct 2016, 11:23 AM #8Member: Blue and white apron brigade
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I assume you mean turn of VFD, disconnect VFD from motor, connect motor to resistor bank. If that was not done it could end up sending a bolt of emf back into the VFD.
That's why its better to let the VFD do all the switching as it does it a lot faster and safer than any manual operation.
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9th Oct 2016, 02:56 PM #9Most Valued Member
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Hi Bob,
No. It appeared to me the mens shed has 3P and the only reason you where using a VSD in this case was to get braking. If that's the case, couldn't you forget the VSD and just switch the motor from mains to a resistor bank. Wouldnt be as good as the VSD braking because there will be no DC, But you should be able to shorten 3 minutes considerably.
It would be more mucking about to set up than the VSD but may work out cheaper and maybe even more reliable?
Stuart
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9th Oct 2016, 03:33 PM #10Member: Blue and white apron brigade
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10th Oct 2016, 12:34 AM #11
Hi Stu,
that's how they used to do it in the old days. The bigger the resistor (and lower the resistance) the better it worked. I've seen old machines with a rotary change over switch that did just that: Run - OFF - BREAK/STOPCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....