Hafco DC90

**BobL** · 7th July 2022, 05:34 PM

Originally Posted by AndrewK01

Thanks Bob, I have a dedicated circuit to the Dusty Shed that can handle the power, so that side of things is covered, I found a suitable VFD on AliExpress, so I will get one of those underway

Is there any benefit in keeping the lower felt bags ?, I am putting a pair of canister filters on top to reduce the height a bit.

Keepinbg the lower flat bags would help/assist air flow but one they fill with sawdust, then less so, especially if you are planning on using pleated filters on top.

I cut the 3 4” fittings off the front of it, and opened it up to 6”, I would have liked to use the 8” opening, but I am buggered if I can find 8” duct and fittings here in NZ

There's no such thing as 8" PVC plumbing/stromwater pipe. There are teleco PVC fittings that come in 8" but they cost and aroma and a leg. Then you have to pay 3 arms and a leg for the cost of the fittings. Cheap Stormwater and DWV PVC next size up is 225mm (which is actually 240mm ID) but those fittings are also expensive. You could have used galvanised ducting which I understand does come in 8" but that's can also be expensive.

You could improve things a little by using a flared inlet (reverse bell mouth hood) like this.
Upgrading a 3HP Single Phase DC with 4HP 3P motor and VFD

**AndrewK01** · 17th July 2022, 04:19 PM

Just waiting on a vfd and a controller, It will be interesting to see how much more suck this has compared to a dc-7

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**BobL** · 17th July 2022, 06:08 PM

Yes it will be interesting.
Your limit is still going to be the 6" intake.
According to the online manual it says the fan is only 12" but that can be right, have you measured it?

**AndrewK01** · 17th July 2022, 06:24 PM

I did see the 12” in the manual, their website says 355mm, the tape measure says the same, and it has 14” stamped on the impeller

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**Chris Parks** · 17th July 2022, 06:36 PM

Originally Posted by AndrewK01

I did see the 12” in the manual, their website says 355mm, the tape measure says the same, and it has 14” stamped on the impeller

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That should work Andrew, so much for manufacturers technical information in brochures.

**AndrewK01** · 21st July 2022, 04:21 PM

The Ecogoo VFD arrived yesterday along with the new controller from Auto Blast Gates, thanks to NCArcher who sorted out some instructions to program the VFD I gave it a test run today, it’s all running well, and I just need to move it to the Dusty shed and replace the current one

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**BobL** · 21st July 2022, 05:13 PM

Can you run it with the impeller open and report back on the current drawn?
That will give us an idea of how many horses it really is using.

**AndrewK01** · 22nd July 2022, 02:42 PM

I have got a clamp meter coming Bob, so I will have a look at that when it arrives

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**AndrewK01** · 29th July 2022, 10:54 AM

I did some testing today, with the 200mm inlet it pulls 5.65A, and with the 150mm it pulls 5.4A, that’s running at 60Hz

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**BobL** · 29th July 2022, 12:05 PM

Originally Posted by AndrewK01

I did some testing today, with the 200mm inlet it pulls 5.65A, and with the 150mm it pulls 5.4A, that’s running at 60Hz

Is that in the 3P outlet wires or the 1P input wires?

Both readings at 50 and 60Hz would be handy.

**AndrewK01** · 29th July 2022, 12:18 PM

That was the 3P output

The input @50Hz

150mm outlet 10.64A
200mm outlet 11.12A

Input @60Hz

150mm outlet 14.02A
200mm outlet 14.70A

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**BobL** · 29th July 2022, 02:44 PM

Originally Posted by AndrewK01

That was the 3P output

The input @50Hz

150mm outlet 10.64A
200mm outlet 11.12A

Input @60Hz

150mm outlet 14.02A
200mm outlet 14.70A

Thanks - that looks fairly consistent ie a 20% increase in speed should require ~40% more energy/current.

I would have thought it would draw a bit more current with the larger outlet especially at 60Hz

Those currents suggest the motor is develop between 3 and 4HP so the DC appears to be impeller size limited.
At 50Hz a motor developing a full 5HP should draw about 17A.
I suspect the shortish PFs may also be constraining the flow - very carefully and briefly you could try running without the filters and see what current it draws at 50Hz - you may trip the breaker at 6OHz.
Ultimately the limit is going to be 6" ducting.
The main thing is the motor with a 5HP rating should long term cope with 60Hz just fine.

How's the noise?

**AndrewK01** · 29th July 2022, 03:10 PM

I’m not sure of the noise yet, as I have just fired it up in the Shed to test it, I don’t think it will be too loud once it’s in the dusty enclosure.

What power factor do you use for 3PH induction motor calcs ?.

The Input is 245v so that might change the calcs slightly

I ran it without 1 of the filters, and the 150mm intake

The input side pulled 10.62A @50Hz and 18.04A @60Hz

So it does look like the filters are restricting it a bit

I had worked it out to be around 4.2HP @60Hz using a PF of .8 or 4.7 using a PF of .9

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**BobL** · 29th July 2022, 04:05 PM

Originally Posted by AndrewK01

I’m not sure of the noise yet, as I have just fired it up in the Shed to test it, I don’t think it will be too loud once it’s in the dusty enclosure.

What power factor do you use for 3PH induction motor calcs ?.

The Input is 245v so that might change the calcs slightly

I ran it without 1 of the filters, and the 150mm intake

The input side pulled 10.62A @50Hz and 18.04A @60Hz

That doesn't sound right, with the filters on @ 50Hz it was 10.64A, and with the filters off it's 10.62A?

**AndrewK01** · 29th July 2022, 04:13 PM

Originally Posted by BobL

That doesn't sound right, with the filters on @ 50Hz it was 10.64A, and with the filters off it's 10.62A?

It didn’t look right to me either, so I just tested it again with a filter off and got 10.8A @50Hz

Strange thing is I got 5.4A @60Hz on the 3Ph side with the filter off, which is the same as with the filter on

I am guessing there is is little to no restriction with the filters on and it running @50Hz

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