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480v Split Phase


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#1 Daveyboy

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Posted 30 November 2006 - 05:48 AM

Hi all,

Just wondering if anyone knows how to connect a 480V split phase supply (2 phases) to a 3 phase VSD. Its a 22KW ABB VSD.
Thanks.

#2 niallnz

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Posted 01 December 2006 - 12:22 AM

Little more detail please.

Which model ABB drive? ACS550, ACS600, ACS800, ACS400 or older than these?
What is the voltage rating of the drive?
What size motor are you connecting to the drive?
Single phase supply connection to an ACS550 drive is permisible, BUT the drive rating is greatly reduced also the rated voltage of the drive tells the drive software what DC bus voltage to expect. So when you single phase the supply you have to have the supply voltage in the correct range to produce the expected DC bus voltage.

Why have you only got two phases available.


Cheers Niallnz


#3 Daveyboy

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Posted 01 December 2006 - 03:47 AM

Hi, answers in red
QUOTE(niallnz @ Dec 1 2006, 11:22 AM) View Post

Little more detail please.

Which model ABB drive? ACS550, ACS600, ACS800, ACS400 or older than these?Its the ACS550
What is the voltage rating of the drive? 380-480V
What size motor are you connecting to the drive? Connecting to 11KW motor
Single phase supply connection to an ACS550 drive is permisible, BUT the drive rating is greatly reduced also the rated voltage of the drive tells the drive software what DC bus voltage to expect. So when you single phase the supply you have to have the supply voltage in the correct range to produce the expected DC bus voltage.

Why have you only got two phases available.Because its on a farm with limited supply.
Cheers Niallnz



#4 jOmega

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Posted 01 December 2006 - 05:19 AM

Yes, you can connect the input of the ACS550 to a single-phase source.

However, VFD rating must be 2x the motor ... i.e. 11 kW motor requires a 22 kW VFD.

Also, it is important to assure that the dc bus capacitors get precharged properly, and .... that you connect to the appropriate input power terminals..

I believe that the terminals to connect input power to are U1 & W1 .... (may be necessary to jumper to V1 from U1 or W1 .... don't remember any more)...

If you select the wrong pair of terminals, you will probably get a PHASE LOSS fault.

Harmonics on the AC source will be higher....much higher ... and will include even harmonic components.

Ripple on dc bus will also be higher. Could produce a Fault Code #22 ....

Good Luck ...



#5 niallnz

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Posted 01 December 2006 - 08:29 PM

As JOmega says, the ACs550 can be connected to a single phase. In the manual under the wiring overview section about page 13, it says to connect to U1 & W1. I also says that the drive current output is to be derated by 50%, you sould be ok with an 11kW as I assume that you are running a pump.

Fault 22 Supply Phase is determined by ripple in the DC bus voltage, you "should" be ok on a pump application as long as you don't try to go faster than the rated speed of the motor and draw more than 50% of the drive's nominal rated current, in your case no more than 22Amps.

Cheers Niallnz

#6 jOmega

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Posted 02 December 2006 - 04:17 AM

Whether he's running a pump or some other kind of load is NOT the issue.

It's a RIPPLE CURRENT issue for the bus caps .... and a THERMAL consideration from some of the power devices and bus caps.

If the motor is 11 kW ...... the VFD must be rated at 22 kW.

An 11 kW motor on a single-phase sourced 11 kW VFD is not sanctioned, and WILL result erratic operation of the VFD. (H/S OT Fault..... Phase Loss Fault....determined by magnitude of dc bus ripple voltage).

And regarding the note on page 13 ..... that is applicable ONLY for the designated single phase units wich are operated at 220v .... As I said in previous post .... there may be a jumper needed between input V1 and one of the other input terminals which, may be factory installed in the designated single-phase ACS-550 units.

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