VFD-Need Help Identifying Terminals

[npalen]

Been using this VFD to power a buffer for several years and now wanting to use it for a three phase motor on my lathe. I'm curious what the terminals are for that are circled in red. Any ideas? TIA

 

[hiddentacocatneddih]

Picture is really blurry

+ and - on a VFD typically is the DC bus internally.

 

[npalen]

Did you click on the thumbnail?

The four terminal markings left to right are: (/) +1 + -

The two middle ones are jumpered together.

 

[hiddentacocatneddih]

What brand VFD is it ?

 

[npalen]

It is a Polyspede brand but they were apparently acquired by Hitachi. The Polyspede number is XLT5-20 (2.0 HP) and the Hitachi number is L100-015NFU. I have the manual as well as a quick reference manual but neither show these terminals.

 

[npalen]

I'm wondering if those terminals are for an external braking resistor. Would that make sense?

 

[hiddentacocatneddih]

I'm wondering if those terminals are for an external braking resistor. Would that make sense?

That's pretty common as well.

Normally the manual will spell out what the terminals are.

 

[CalG]

http://www.polyspede.com/pdf/XLT3M.PDF

 

[npalen]

http://www.polyspede.com/pdf/XLT3M.PDF

Thanks for posting. I scanned thru it but don't see anything like the terminals.

I did find the Hitachi version manual but don't see anything in there either.

https://cdn.automationdirect.com/static/manuals/l100/l100.pdf

 

[Handloader109]

Uh, on most of these type devices, they aren't for you to mess with...
Truly, Stick with the front terminals. Just sayin

 

[hiddentacocatneddih]

Uh, on most of these type devices, they aren't for you to mess with...
Truly, Stick with the front terminals. Just sayin

That's no fun. Hit it with a meter and see if it's got juice

 

[npalen]

https://cdn.automationdirect.com/static/manuals/l100/l100.pdf

Page 5-2 shows some components on the terminals in question although I don't see the one marked (/) in the first post picture.
I doubt that any additional braking resistor will be needed on this 1.0 HP lathe application. I'm guessing that deceleration rate can be adjusted to make thread die and tap die reversals quick enough. Single point threading up to a shoulder can require a quick stop if the half nut isn't operated for each pass.

 

[m1garand762]

Do not hook anything to the dc bus and make sure it is good and discharged before you touch it. Once the charge light goes out your ok to touch

 

[npalen]

Do not hook anything to the dc bus and make sure it is good and discharged before you touch it. Once the charge light goes out your ok to touch

So, you're saying that the terminals shown in post no. 1 are the dc bus?

 

[m1garand762]

So, you're saying that the terminals shown in post no. 1 are the dc bus?

Yes , ac voltage is marked l1,l2,l3 on incoming and u,v,w on outputs. +,- are tue dc bus.