[Al_The_Man]

Ok, back in the office. Looks like quite the debate on which terminals to use for single phase input. I double checked the manual for this SK2201 and still find NOTHING about connecting to single phase.

Tom

The technical documentation I have shows the SK 2201 as: 1 ph Can be input on L1 - L2.
The motor size capacity will be reduced from 15.5hp on 3ph to 11.6HP on 1ph.
Al.

[mactec54]

The technical documentation I have shows the SK 2201 as: 1 ph Can be input on L1 - L2.
The motor size capacity will be reduced from 15.5hp on 3ph to 11.6HP on 1ph.
Al.

The VFD the Toolchatter has is a SK22001 4.0Kw 5Hp, the SK32001 is 11Kw 15hp

Only the A series SK drives have a L1 & L2 input for 1 ph, all the rest have it listed in there technical manual as L1 & L3 for single phase use

[Al_The_Man]

Well I guess there is a conflict in their data, the OP stated the model as SK2201 not SK22001?

[ToolChatter]

It's a 2201, rated at 5hp normal duty. The last page of the manual says the AC supply can be up to 264 V.

I got my buddies transformer...it's a Powerstat 116, rated at 120V 7.5A. Does anyone know if the insulation can handle 240V for me to reform the caps?

[mactec54]

It's a 2201, rated at 5hp normal duty. The last page of the manual says the AC supply can be up to 264 V.

There input voltage rating is 200v to 240v +/- 10%

You are way to high with your RPC at 265v

The attachment is from the manual for your drive, why have you not wired it with your 220v single phase, your RPC is totally ridiculous, to run a VFD like this

[ToolChatter]

There input voltage rating is 200v to 240v +/- 10%

You are way to high with your RPC at 265v

The attachment is from the manual for your drive, why have you not wired it with your 220v single phase, your RPC is totally ridiculous, to run a VFD like this

240V +10% is 264V, so we're both saying the same thing. 265 is obviously a touch higher, but I'd be really surprised if they cut it that close. That's just the no-load voltage as well...it will drop when the motor is actually running. I'd try pulling out one of the balance

The manual that came with it makes absolutely no mention of the drive being able to run on single phase input, whereas for other smaller drives it is officially stated. That's why I assumed it isn't set up for single phase, which is why I'm using the 3-phase from my RPC. I've since heard from several people, however, that it will run on single phase even though it isn't officially stated (at least in the documentation that came with it).

Anyone have any thoughts on whether or not the powerstat will be ok at 240V? The current to reform the caps is small, so it's only a question of internal insulation I believe.

Thanks

[hub]

Just thinking out loud...
How old is your VFD? Current ones might have different specs than older ones (maybe).
I would not recommend going above 240VAC.

Hub

[Al_The_Man]

The manual that came with it makes absolutely no mention of the drive being able to run on single phase input,

Here is a page from the Tech doc.
Al.

[ToolChatter]

BOOM! Al for the win! Pretty much the smoking gun right there...hook up single phase to L1 and L2 and get a derated power of 3.5 kW. Why on earth they don't put that manual in the box is beyond me, but a search on the Emerson site produces that manual with that info. Thanks Al.

The powerstat will go up to 140%, so if I just run it off of 120, I'll get 168V. Do we think that's enough to reform the caps?

Thanks again!
Tom

[ToolChatter]

Ok, so I performed the reforming process but only took it up to about 145V. Based on absolutely zero knowledge of elctro-chemistry, I decided that should be enough to build up the oxide layer. During that process, the unit powerd up at about 80V and gave a low DC bus voltage as expected.

After I was done with that, I hooked up 240V to L1 and L2. The unit powered up and immediately threw the HF26 error again. I measured the DC bus voltage at 336V.

Any thoughts on the likely culprit for this error?

[mactec54]

ToolChatter

Overcurrent detection at power up

Do you have a load that is on when you start up the VFD, It also may be damaged from when you ran it before

Try L1 & L3

[ToolChatter]

No motor hooked up. Tried L1 and L3 with the same result. If I blew something, is it likely to be evident if I open it up? If so, where should I look?

[mactec54]

ToolChatter

If the IGBT has not blown it's guts out, it may be able to be repaired, if it is evident in the drive that this has happened, then in most cases it will be junk

Over current trips destroy IGBTs, which in turn cause input rectifiers to fail

[Al_The_Man]

After I was done with that, I hooked up 240V to L1 and L2. The unit powered up and immediately threw the HF26 error again. I measured the DC bus voltage at 336V.

Any thoughts on the likely culprit for this error?

That DC would be about right for 240vac, DC = ACrms x 1.414 = 240 x 1.414 = 339vdc.
Al.

[ToolChatter]

Who wants to circle some components for me to check out??? I know, sounds like way too much fun.