please help, VFD wiring

Casey4545

Casey4545

Joined
Jun 10, 2011
Messages
242
Hi guys, I'm really hoping someone would be so kind and help me with a few questions. I just got a brand new 1hp 3 phase disc sander, and a VFD control. Unfortunately, I know nothing about electronics and have never so much as changed a light switch before. I'm trying to get this wired up and I've read the manual, and tried google but I'm coming up short. I will be the first to admit I am totally inexperienced with this, it reads like a foreign language to me.

Question 1 kind people (also I really need layman terms please, sorry I am a total newbie with this)

I connected the power cord (the one with prongs on the end) with 3 wires (Green, Black, White) inside the VFD. I connected Black to L1, White to L2, and Green to the green screw. Is this correct?

2. I have another cord (2ft long) to connect the VFD to the motor. It has 4 wires on each end. They are Green, Yellow, Brown, and Red. These I'm assuming need to be connected to the 3 screws shown in below picture (Green I know should go to green ground screw). The screws are labeled U V W, which color wire goes to which letter screw??

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3. The other end of that cord (with the Green, Yellow, Brown, Red wires) needs to go to the motor. There are 9 numbered wires T1-T9, I know they get connected per the diagram on the motor. So for example T1 & T7 get connected along with one of the wires on the connecting cord using a wire nut. But what color wire gets connected to that combination of T#'s? The diagram says T1&T7 T2&T8 T3&T9 and then T4,5,6 go with eachother. But for the combination of two T wires, which color from the cord gets added?

4. In the last pic you'll see a tag attached to two smaller diameter wires. It says these leads terminate three 140C normally closed thermostats. My question is what do I do with those wires? The ends are bare exposed wire, do I just leave them like that?

Guys, seriously thank you so much for anyone willing to help me out with this long post, and for your patience. I realize this is probably first grade stuff for most, thank you for the help! :)

Casey

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The answer to any how do I wire this motor = Show really good photos of all the motor data plates

What make and model of the vfd is it and post the link to the manual



1 and 2,
It's ok what you have there, do it the way you show.


3
It doesn't matter which of the three wires from the vfd to the motor are which.
If it's going in the wrong direction, just swap any two wires.

Just hook up the motor correctly, use the right high / low voltage diagram




As for the others, let's see the motor plate photos



If it's for a disc sander, you need a foward rverse switch, let's see the manual, have you got a foward reverse jumper ?
make sure you set the 110-220 jumper
 
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Thanks very much for the reply Count, I took more pictures and I'll include a link to the manual. The motor is a Techtop model BL3-AL-TF-56C-4-B-D-1 I'll include a pic of the plates also. Do the different color wires on the cord matter which T-number combination they get connected to?
Link to manual
http://www.essexbrownell.com/Catalog/00053689/CatalogDocuments/Datasheets/kbac_manual.pdf

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You're going to use the low voltage chart

4-5-6 all connected together by themselves

1-7

2-8

3-9

Each of those gets one of the three wires from the vfd,
As I edited above, no order to which is which

If the motor is running the wrong way, just swap any two of the three wires.


You're going to put that switch in place of the forward reverse jumper


It should all work after that.



But

That will have power running to it all the time.

Either unplug it when you finish, or you can use that 0-1 hole on the bottom for a power switch
Put a switch in line with the power cord before the connections you have now.
 
Thanks Count, okay so any colors from the VFD can go to the motor wires. I do have the forward reverse switch, I wasn't even going to mess with that until I get up the VFD connected but I'm sure Ill have a few questions. I did move one jumper from 230v to 115V. I'm not sure if there is a forward reverse jumper or not. There is one labeled "relay" with an F and R on the side, is that it?
 
All three wires of a three phase system are "hot" . The order that they are connected to the motor is unimportant. And as 12345678910 says, if the motor runs in the wrong direction. Swapping any two of those three wires will make the motor run the other direction.
 
Okay thank you both! I'll connect it and see if it works. One last question, do the two wires with the tag on them that says "These leads terminate three 140C normally closed thermostats" do those just stay bare/exposed inside the housing for the wires? Thanks again
 
Casey4545 said:
I do have the forward reverse switch, I wasn't even going to mess with that until I get up the VFD connected but I'm not sure if there is a forward reverse jumper or not.

There is one labeled "relay" with an F and R on the side, is that it?
Click to expand...

I have the two HP model, it looks like this

http://i1085.photobucket.com/albums/j422/TheCount12345678910/vfdfwdrevfootkbac27d-1.jpg

Casey4545 said:
One last question, do the two wires with the tag on them that says "These leads terminate three 140C normally closed thermostats" do those just stay bare/exposed inside the housing for the wires?
Click to expand...

Look up the manual for that motor to see what you do with them, there's a web address on the motor plate.

I have no experience with that, but you never leave anything bare and exposed
 
Casey4545 said:
Okay thank you both! I'll connect it and see if it works. One last question, do the two wires with the tag on them that says "These leads terminate three 140C normally closed thermostats" do those just stay bare/exposed inside the housing for the wires? Thanks again
Click to expand...

As per the Counts advice, check with the supplier and don't leave the wires bare.

A lot of the industrial motors I come across have thermistors fitted in the windings. These are usually only suitable for low-voltage (the label usually says not to apply more than 5V when testing them). They are connected to a separate thermistor relay that is wired to cut the main power to the motor if the windings overheat.

If the thermistor relay is fitted on the plant, we obviously connect the thermistors. If the thermistor relay is not fitted, we don't connect it. They are most often fitted on biggish motors (20 HP and up), Hazardous-Area motors and motors used in dusty locations or locations with a high fire risk.

I'm in Europe and some things are done differently here, but I'd guess the thermostats are there to do the same job as the thermistors. If they are thermostats, they probably don't have the 5V limit of the thermistors. You should be safe just securing/insulating the ends.
 
This thread is very timely. I just finished wiring up a KBAC 24D and 1HP Leeson motor the way you've described and it works but the bottom LED slowly flashes red. The trouble shooting chart says that it means a short circuit. Any suggestions? (If this is considered a high jack let me know and I'll start a new thread)
 
Pheer Grinders has a youtube channel that goes over the wiring of a 3 phase motor and a KBAC 27d which is about the same as the 24d with wiring. Mine is 230v. I followed those videos and it worked perfectly on the first try. Also got my wiring from Wayne Coe.
 
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