vfd help...

[crsaz]

I have an old reeflo barracuda pump(sequence motor) I think I have found a replacement

this looks to be the direct 230v replacement, does anybody know if the 56c frame will mount up to the mdminc wet side

here is the replacement I've found,but I would like to find a baldor to match up to my pump face.
http://cgi.ebay.com/BALDOR-1-2-HP-AC-VM3538-3-PHASE-MOTOR-MOT1973_W0QQitemZ360125280235QQcategoryZ42920QQcmdZViewItemQQ_trksidZp3286.m7QQ_trkparmsZalgo%3DLVI%26itu%3DUCI%26otn%3D3%26po%3DLVI%26ps%3D63%26clkid%3D4864351821155727170

 

[kcress]

I don't believe so. Most pumps demand "J" motors which expect to have their impellers screwed directly onto motor's shaft.

Does the pump you want to use have a threaded impeller?

Have you looked at the VFD thread? Lots of pictures and explanations.

 

[BeanAnimal]

That motor will not work. It is a "C" type motor with a keyed shaft and no feet. The motor is mounted via its FACE (like the starter motor on your car). As mentioned, you need a "J" type motor. It will have a threaded shaft and an unmachined face with a threaded mounting holes and mounting feet.

 

[crsaz]

Ok, I've found the correct replacement now the question is how do I contro the vfd. Say like ramping up and down throughout the day.. I know the vfd comes with 0-10v inputs. But how would I pair this up with somthing like a microcontroller.

 

[dmarkham]

The correct term is C frame and J frame motors. One place to always get help with VFD's is at your local electrical motor or power transmission distributor. They also can get the parts as well.

 

[kcress]

There are two possibilities.

1) Use a controller with an analog out that sends whatever speed profile you want via 0-10V.

2) VFDs have digital speed inputs. You set what speed you want when a particular input is active. Whenever you energize that input the VFD will run at a set speed. This makes any ON/OFF controller work.

Going further the "rate" at which the VFD transitions to ANY set speed can also be adjusted. This means you could have one input that commands 100%. You can adjust the "rate" setting so it takes 20 seconds for the 100% to be reached. This prevents sudden speed changes.

 

[BeanAnimal]

The correct term is C frame and J frame motors. One place to always get help with VFD's is at your local electrical motor or power transmission distributor. They also can get the parts as well.

Actually, C and J are not NEMA frame designations, they are only modifiers used with designated NEMA frame sizes. That is, there is no such thing a a C or J frame, however there are 56J and 56C frame motors.

As for the local power transmission disributor... sure, if you want to pay $800 for a $400 motor or $400, for a $200 drive. While I am all for buying locally, industrial supply houses and home hobby DIYers are not a good match. Using the knowledge of the local supply house without buying from them is dishonest and only contributes to their overhead and resulting high prices.

 

[stugray]

One of these:

http://www.factorymation.com/s.nl/sc.2/category.13/.f

and these:

http://www.factorymation.com/s.nl/it.A/id.41/.f?sc=2&category=1296

can give you full speed control of the CL, ATO, RO/DI res., and it can turn on your lights.

Oh.... and it will build you an island then transform into a plane & fly you there

see this:

http://www.reefcentral.com/forums/showthread.php?t=1750674

Stu

 

[BeanAnimal]

I would choose the EV series over the FM series.... The EV is sensorless vector drive and has better torque characteristics at low RPM.

 

[crsaz]

stuguy, I was looking at those,
but... how flexible are they? what Im really after is ramping up and down almost exactly like eco-techs lagoon and reef crest mode, but speed and intervals all set by me, will that controller beable to do that? sorry for asking so many questions but I cant get the pdf's to open up.

 

[kcress]

Remember post #6? If you can live with a couple of fixed speeds and slow ramps to and from them then the shopping list Stu gave does the trick. If you want any speed any time then you need the 0-10V method. If that is what you want you need to get the mating Analog Out module too.

If you have no clue what LADDER LOGIC is or what LOGIC BLOCKs are, I'd advise you don't go this way.