Re: What air compressor for Mac's clamps?
Hi, Mike ¨C ? I have a similar California Systems compressor (the 10-gallon CAT-10020C) and use that not only for my Big Squeeze clamps, which are similar to Mac¡¯s, but also to operate my Nordfab automatic blast gates.?? Works fine, though the compressor kicks in about every 15 minutes or so while I¡¯m at the slider. ? -Rob
|
Re: What air compressor for Mac's clamps?
I do not have one but certainly there are ways to reduce the noise from a given portable compressor.
|
Re: VFD issue with 3 Phase power supply
Update. Another utility trouble shooter tech came by last night. This one was much more knowledgeable. He did not have a power quality meter or oscilloscope but he escalate to have a power quality tech come to test. More importantly he told me that ¡°I didn¡¯t
tell you this but we¡¯ve had a ton of
Issues with the transformer we installed here¡±. He also told me that the power line behind my property where my transformers connect is scheduled for replacement and that they would only do that if there was an issue with being able to balance it. Also
learned that if you have more than 40mV of drop across fuses in a panel the fuse is bad and will fail.?
toggle quoted message
Show quoted text
On Jun 4, 2021, at 10:43 AM, Joe Jensen <joe.jensen@...> wrote:
?
I am also going to lower the current limit in the programming to see what happens as it¡¯s a really easy test.? The new VFD is rated for like 19.6A output
and I am only running at 11.8 so probably nothing but an easy test.
?
?
Once you verify the motor is fine without the vfd, and the utility power is balanced going into the vfd, it would seem the vfd is at least part of the problem.? I'm voting that the motor has issues
until you rule that out.? Dave
Some more background.? I brought the idea of variable speed to increase suction on small ports to Robert founder of Oneida at the Vegas show like 10
years ago.? We traded a ton of emails and he swore me to secrecy and the idea became the Oneida Smart collector which won innovation of the year at either Vegas or Atlanta.? In appreciation for the idea Oneida upgraded my collector to a 5HP Smart collector,
single phase input.
?
Lately I was having some issues with the 10 year old VFD shutting down and Oneida was very helpful and we found that for some reason some of the parameters
were corrupted in the old single phase VFD.? Through this process I learned a lot about programming VFDs and I realized that the programming of the VFD was set to limit output current (the current limit of the original VFD) to 8.9A. The 5HP Baldor high efficiency
motor is rated at 11.8A.? In running the VFD and watching parameters I realized that the motor was never even getting to 60 HZ due to the current limit.
?
So I decided to upgrade the VFD to a 3 phase input. Same series ABB but at least with the ABB ACS310 series they are built as single phase input or
3 phase input.? So I ordered an ACS310 5HP 3 phase input VFD.? Super easy install as the programming just copies over.
?
But the new VFD faults.? Last week it would fault after a few minutes.? When measuring the input currents the delta then was about 30%.? Over the weekend
it didn¡¯t fault at all and the current deltas were 20% or so. ?ABB sent a replacement VFD and it did not solve the issue.? Last night would get faults in less than a minute and the current delta was over 40%.
?
More background:
-
I have 600A of Utility 240V Delta 3 phase power.? Two transformers in my front yard.? New install one year ago with new buried lines from front yard to workshop.
-
The workshop has a 5 Ton AC, 1.5HP pool pump, and sometimes an AC and water heater on for the guest house, plus 2,200w of LED lighting.? I doubt I¡¯d ever see more than 100A or load at
one time.
-
I have a 3 phase shaper and a 3 phase bandsaw running in the shop with no VFD and the currents are pretty consistent on all lines.
-
Voltage at the panel and at the VFD for all three legs is very similar.
-
When the utility came out this week to test I started as many loads in the shop as I could and we had 0.2V difference for the two transformer legs measuring 121.3V and 121.1V.? Leg B
being lower
-
It seems like the average current across the three legs is the same each time I measure even though the delta between legs can be quite different each time.
?
Can a phase error between the phases cause lower current in one leg?
?
?
More thoughts after rereading your post.
You mention original VFD as single phase and new as 3 phase input. This could be important if you are running with single phase input.
At first I thought you were running new VFD with single phase input but you report 3 input currents. Just curious, why are you using a VFD with 3 phase input on a dust collector with a 3 phase motor?
Another thought. I am sure you know this, on a VFD, the single or 3 phase input is used to create a DC power supply. This to me means that there should not be a repeatable phase relationship between input and output currents. A resolution
to your problem can help further our understanding of how these things work.
?
I had to replace the VFD on my dust collector. It was an ABB ACS310 single phase input feeding a 3 phase 5 HP motor. This was from Oneida and because of the single phase supply they set the max current at the limit of the drive which is below the amperage
of the motor. Anyway the new drive, an ABB ACS310 5HP 3 phase input VFD, faults with my utility delta 3 phase supply. The fault is due to uneven current on the input. I¡¯ve spent hours measuring and testing and worked with ABB tech support several times. The
key test ABB had me do was to swap two wires to see if the low current moves. It does not so ABB said not the drive. But they did approve a warranty swap. With the replacement I see the same problem. With leg A I get 20A leg B 15A and leg C 19A. Leg C is the
wild leg. The voltages under load for legs A and B are within 0.2V. I also had the utility out and then measured and said all good on their side. They did not put a scope on the lines to see is I have phase shift issues. Could a phase different between the
lines cause a 20-25% current difference when the voltages are the same? ?Also I have notices that the current difference changes. Worst was tonight with 22A, 14A, and 20A.?
also I have two other 3 phase machines that run and the currents measure the same on all three legs for those machines. I also tried running the VFD with a new breaker and also on a different line. ABB agreed to swap the drive because the currents are the same
on all legs with non-VFD machines. ?
the only thing I can think of is the phase angles between the three legs is not 120 degrees. HELP
|
Re: What air compressor for Mac's clamps?
Thanks all. ?I bought a California Air off of the scratch and dent page. ?I believe this is a tool acquisition that my spouse will heartily endorse!
toggle quoted message
Show quoted text
On Jun 4, 2021, at 5:00 PM, Airtight: Clamps by Air Compression < airtightclamps@...> wrote:
Mike, I use this one in my assembly works great startles my wife when it go¡¯s off. Sorry for the monster link mac,,,
Designing and building for 50 years ? I bought this just for air clamps:California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.ImranOn Jun 4, 2021, at 6:12 PM, habacomike via <habacomike@...> wrote:?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. ?I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. ?The craftsman makes a ton of noise and startles my spouse every time it starts. ?Any suggestions for something more appropriate?Mike
|
Re: What air compressor for Mac's clamps?
I have the small California air.?? Had it for a couple of years now and works well.? I have it connected to and use it for my Felder clamps, RL 160 and CNC (uses air to assist the lift of the three heads) and have not had any problems other than some leaky connections. ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of george Woodg via groups.io Sent: Friday, June 4, 2021 9:20 PM To: [email protected]Subject: Re: [FOG] What air compressor for Mac's clamps? ? You can have a conversation with someone standing next to a California Air. ? I have the older version of the one below since 2014 no issues, I don¡¯t use a lot of air and they run my clamps and general stuff just fine, a little louder than Imran¡¯s but pretty quite? California Air Tools 10020C Ultra Quiet Oil-Free and Powerful Air Compressor, 2 HP
On Jun 4, 2021, at 6:37 PM, imranindiana via groups.io <imranindiana@...> wrote:
?I bought this just for air clamps:
California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver
I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.
Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.
Imran
On Jun 4, 2021, at 6:12 PM, habacomike via groups.io <habacomike@...> wrote:
?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. ?I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. ?The craftsman makes a ton of noise and startles my spouse every time it starts. ?Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
Had the same thought in mind recently when I noticed this at Harbor freight when expanding my blue toolbox collection. For this price they are accessories for the clamps.
--
Mike B
|
Re: What air compressor for Mac's clamps?
Clamps don't need a lot of CFM? unless your hoses leak? like sieves.? I
be? one of those portable ones would do fine
toggle quoted message
Show quoted text
On 6/4/21 6:11 PM, habacomike via groups.io wrote: About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. The craftsman makes a ton of noise and startles my spouse every time it starts. Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
Forgot to mention that the frequency of sound is also much lower.
Imran
toggle quoted message
Show quoted text
On Jun 4, 2021, at 9:22 PM, george Woodg via groups.io <george954679@...> wrote: ? You can have a conversation with someone standing next to a California Air. On Jun 4, 2021, at 7:01 PM, Mark Kessler <mkessler10@...> wrote:
? I have the older version of the one below since 2014 no issues, I don¡¯t use a lot of air and they run my clamps and general stuff just fine, a little louder than Imran¡¯s but pretty quite?
California Air Tools 10020C Ultra Quiet Oil-Free and Powerful Air Compressor, 2 HP https://www.amazon.com/dp/B0188XBTLY/ref=cm_sw_r_cp_api_glt_fabc_CZ31QDNYEBSF2X5XWPAX On Jun 4, 2021, at 6:37 PM, imranindiana via groups.io <imranindiana@...> wrote:
?I bought this just for air clamps:
California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver https://www.amazon.com/dp/B01LYHYHEA/ref=cm_sw_r_cp_api_glt_fabc_T5JY3372469Q2WHYAJEH?_encoding=UTF8&psc=1
I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.
Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.
Imran
On Jun 4, 2021, at 6:12 PM, habacomike via groups.io <habacomike@...> wrote:
?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. ?I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. ?The craftsman makes a ton of noise and startles my spouse every time it starts. ?Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
You can have a conversation with someone standing next to a California Air.
toggle quoted message
Show quoted text
On Jun 4, 2021, at 7:01 PM, Mark Kessler <mkessler10@...> wrote:
? I have the older version of the one below since 2014 no issues, I don¡¯t use a lot of air and they run my clamps and general stuff just fine, a little louder than Imran¡¯s but pretty quite?
California Air Tools 10020C Ultra Quiet Oil-Free and Powerful Air Compressor, 2 HP https://www.amazon.com/dp/B0188XBTLY/ref=cm_sw_r_cp_api_glt_fabc_CZ31QDNYEBSF2X5XWPAX On Jun 4, 2021, at 6:37 PM, imranindiana via groups.io <imranindiana@...> wrote:
?I bought this just for air clamps:
California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver https://www.amazon.com/dp/B01LYHYHEA/ref=cm_sw_r_cp_api_glt_fabc_T5JY3372469Q2WHYAJEH?_encoding=UTF8&psc=1
I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.
Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.
Imran
On Jun 4, 2021, at 6:12 PM, habacomike via groups.io <habacomike@...> wrote:
?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. ?I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. ?The craftsman makes a ton of noise and startles my spouse every time it starts. ?Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
I have the older version of the one below since 2014 no issues, I don¡¯t use a lot of air and they run my clamps and general stuff just fine, a little louder than Imran¡¯s but pretty quite?
California Air Tools 10020C Ultra Quiet Oil-Free and Powerful Air Compressor, 2 HP https://www.amazon.com/dp/B0188XBTLY/ref=cm_sw_r_cp_api_glt_fabc_CZ31QDNYEBSF2X5XWPAX
toggle quoted message
Show quoted text
On Jun 4, 2021, at 6:37 PM, imranindiana via groups.io <imranindiana@...> wrote:
?I bought this just for air clamps:
California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver https://www.amazon.com/dp/B01LYHYHEA/ref=cm_sw_r_cp_api_glt_fabc_T5JY3372469Q2WHYAJEH?_encoding=UTF8&psc=1
I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.
Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.
Imran
On Jun 4, 2021, at 6:12 PM, habacomike via groups.io <habacomike@...> wrote:
?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. ?I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. ?The craftsman makes a ton of noise and startles my spouse every time it starts. ?Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
Mike, I use this one in my assembly works great startles my wife when it go¡¯s off. Sorry for the monster link mac,,,
Designing and building for 50 years
toggle quoted message
Show quoted text
On Jun 4, 2021, at 5:37 PM, imranindiana via groups.io <imranindiana@...> wrote:
?I bought this just for air clamps:
California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver https://www.amazon.com/dp/B01LYHYHEA/ref=cm_sw_r_cp_api_glt_fabc_T5JY3372469Q2WHYAJEH?_encoding=UTF8&psc=1
I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.
Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.
Imran
On Jun 4, 2021, at 6:12 PM, habacomike via groups.io <habacomike@...> wrote:
?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. ?I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. ?The craftsman makes a ton of noise and startles my spouse every time it starts. ?Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
I bought this just for air clamps:
California Air Tools CAT-1P1060S Light & Quiet Portable Air Compressor, Silver
I comes on after ~6 cycles of dual clamps. Since then I have run air in shop and now it is used in garage for airing tires.
Per OEM listed at 56dB. The only complain I have is that it is easy to catch the pressure relief valve. Scared the dickens out of me when it happened first couple of times. They do make larger models as well which are also relatively quiet.
Imran
toggle quoted message
Show quoted text
On Jun 4, 2021, at 6:12 PM, habacomike via groups.io <habacomike@...> wrote:
?About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. The craftsman makes a ton of noise and startles my spouse every time it starts. Any suggestions for something more appropriate?
Mike
|
Re: What air compressor for Mac's clamps?
This compressor from Lowe¡¯s works great and is extremely quiet. 
|
What air compressor for Mac's clamps?
About the only thing I use my dad¡¯s old craftsman air compressor for is to run Mac¡¯s clamps. I guess I also fill up the odd tire now and then, and blow out some irrigation lines in the fall. The craftsman makes a ton of noise and startles my spouse every time it starts. Any suggestions for something more appropriate?
Mike
|
Great tour.? I was in my home office watching the video and my Alexa stated that I don¡¯t have a vacuum device when you gave her the command on the video, but she was able to play a little Willie Nelson. ? Gil Fuqua Nashville ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of Bill B¨¦langer Sent: Friday, June 04, 2021 12:42 PM To: [email protected]Subject: Re: [FOG] Vail AZ Shop Tour ? Here's better look at the shooting board George, along with some other stuff I neglected.
Bill B¨¦langer
|
Here's better look at the shooting board George, along with some other stuff I neglected.
Bill B¨¦langer
|
I'm in Del Webb! Howdy neighbor!
Bill B¨¦langer
|
Re: Door tooling and jigs
I¡¯ve got the porter cable kit.? I use the the fixture to bore any custom doors I build but tend to a chisel/router plane for hinges.? I¡¯ve got the PC hinge jig (from a long time ago (steel box) but have never used it.? Any more pedestrian trim job, doors are usually pre hung so I usually only swap to better quality hinges.
This jig is really well designed.
James
On Fri, Jun 4, 2021 at 10:09 AM Airtight: Clamps by Air Compression < airtightclamps@...> wrote: Glen this is what I have used for 30 plus years
Mac,,, Designing and building for 50 years ? Thank you Lance
The pc 59381 is in fact what I had and it sounds like the 126 may have been what I had. Thank you for the help and the lnk to Templaco. I do not remember having to flip the PC hinge template. I remember it was pinned to the door and the jamb at the same time and you routed both together.
I will keep my eyes open for the 126, it was a great bevel planer
Glen
Alpine Moulding and Millwork Inc.
Mail: ?? P.O. Box 486
?????????? Murphys , CA. 95247 Shop:
????????? 209-540-7501
LIC # 707507
PC Hinge jig-click see all buying options at right
The Bosche hinge jigs are my preference. I've had both. More accurate than the PC, as the jig doesn't happen to be flipped upside down to move from door to jamb. Originally sold as Stanley, they're the same jigs. Unfortunately, they are no longer manufactured.
Templaco Bore master kits (best made) and other templates/tools???
If doing a bunch of the same doors, Templaco will make custom hinge jigs:?
If there are good door and jamb suppliers anywhere nearby, see what they have for fixed hinge jigs.
The Porter Cable 126 Porta Plane, with spiral carbide blades is the best door planer by miles. Also, no longer available, but now that most door people just use pre-hung and split jamb doors, with patience they can be found used..
Happy hunting,
Lance
?Hi all I am looking for the following tooling that I had as a kid and made the stupid mistake of selling back in the day.
i do believe they are long out of production but maybe some of you might have one laying around you want to sell or can give a recommendation on something equal or better.
This is what i had, dont have part #"s
Porter cable door boring jig, it did 2-3/8, 2-3/4, Dills of 1-5/8 and 2-1/4"? it was a great set and easy to use.
Porter cable Hinge routing template set, it was 4 templates adjustable 3.5 4.0 4.5 and i believe 5"? It had bars to hook it all together and i could do 6/8 7/0 & 8/0 doors easy.
and last
Porter cable bevel planer, it was good and I really can do this on my machines, I would buy it anyway for specific tasks.
I guess the local door shop is not doing well and I am getting a lot of requests hang doors, luckily I know this well as I owned a door shop for 10 years?
i am looking to get the basics and see how this goes before I break down and get a Norfield Magnum.
If you have any of these you want to unload, I am interested, Or if you
know of better stuff, I would would like to hear.
Thanks in advance
Glen
Never thought I was going down this path again.
|
Hi Glenn, Yes I had another shop in Maine, remember the one that was featured in Wood magazine a few years back (2015)?
We sold that house in November of last year (2020) and ordered a new motorhome to use during the summers, but it's not here yet, so we're waiting it out.
Bill B¨¦langer
Bill so you have another shop at your summer home? Wait, it is summer, you're in the wrong shop. Glen
Alpine Moulding and Millwork Inc.
Mail: ?? P.O. Box 486
?????????? Murphys , CA. 95247 Shop: 441 Pennsylvania Gulch Road ????????? Murphys, CA. 95247
????????? 209-540-7501
LIC # 707507
On Thu, Jun 3, 2021 at 7:35 PM Bill Belanger < Bill@...> wrote: Thanks Imran, We¡¯re only here in winters so its not that big of ?a sacrifice. I wanted a place with a big workshop, she wanted a house in a gated community, so we compromised¡.
Bill B¨¦langer
On Thu, Jun 3, 2021 at 18:52 imranindiana via <imranindiana= [email protected]> wrote: Very nicely equipped shop. Envious that you have room for 3 benches. Good to hear what works well.
Very cooperative Mrs. to let go of all 3 garage spaces. David Kumm creates balance with diamonds, what¡¯s your trick ?
Imran On Jun 3, 2021, at 2:47 PM, Bill B¨¦langer < Bllblngr@...> wrote: ?Watching other interesting shops, and thought I'd make a video of mine!
Bill B¨¦langer
|
Re: VFD issue with 3 Phase power supply
I am also going to lower the current limit in the programming to see what happens as it¡¯s a really easy test.? The new VFD is rated for like 19.6A output
and I am only running at 11.8 so probably nothing but an easy test.
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]>
On Behalf Of David Kumm
Sent: Friday, June 4, 2021 10:24 AM
To: [email protected]
Subject: Re: [FOG] VFD issue with 3 Phase power supply
?
Once you verify the motor is fine without the vfd, and the utility power is balanced going into the vfd, it would seem the vfd is at least part of the problem.? I'm voting that the motor has issues
until you rule that out.? Dave
Some more background.? I brought the idea of variable speed to increase suction on small ports to Robert founder of Oneida at the Vegas show like 10
years ago.? We traded a ton of emails and he swore me to secrecy and the idea became the Oneida Smart collector which won innovation of the year at either Vegas or Atlanta.? In appreciation for the idea Oneida upgraded my collector to a 5HP Smart collector,
single phase input.
?
Lately I was having some issues with the 10 year old VFD shutting down and Oneida was very helpful and we found that for some reason some of the parameters
were corrupted in the old single phase VFD.? Through this process I learned a lot about programming VFDs and I realized that the programming of the VFD was set to limit output current (the current limit of the original VFD) to 8.9A. The 5HP Baldor high efficiency
motor is rated at 11.8A.? In running the VFD and watching parameters I realized that the motor was never even getting to 60 HZ due to the current limit.
?
So I decided to upgrade the VFD to a 3 phase input. Same series ABB but at least with the ABB ACS310 series they are built as single phase input or
3 phase input.? So I ordered an ACS310 5HP 3 phase input VFD.? Super easy install as the programming just copies over.
?
But the new VFD faults.? Last week it would fault after a few minutes.? When measuring the input currents the delta then was about 30%.? Over the weekend
it didn¡¯t fault at all and the current deltas were 20% or so. ?ABB sent a replacement VFD and it did not solve the issue.? Last night would get faults in less than a minute and the current delta was over 40%.
?
More background:
-
I have 600A of Utility 240V Delta 3 phase power.? Two transformers in my front yard.? New install one year ago with new buried lines from front yard to workshop.
-
The workshop has a 5 Ton AC, 1.5HP pool pump, and sometimes an AC and water heater on for the guest house, plus 2,200w of LED lighting.? I doubt I¡¯d ever see more than 100A or load at
one time.
-
I have a 3 phase shaper and a 3 phase bandsaw running in the shop with no VFD and the currents are pretty consistent on all lines.
-
Voltage at the panel and at the VFD for all three legs is very similar.
-
When the utility came out this week to test I started as many loads in the shop as I could and we had 0.2V difference for the two transformer legs measuring 121.3V and 121.1V.? Leg B
being lower
-
It seems like the average current across the three legs is the same each time I measure even though the delta between legs can be quite different each time.
?
Can a phase error between the phases cause lower current in one leg?
?
?
More thoughts after rereading your post.
You mention original VFD as single phase and new as 3 phase input. This could be important if you are running with single phase input.
At first I thought you were running new VFD with single phase input but you report 3 input currents. Just curious, why are you using a VFD with 3 phase input on a dust collector with a 3 phase motor?
Another thought. I am sure you know this, on a VFD, the single or 3 phase input is used to create a DC power supply. This to me means that there should not be a repeatable phase relationship between input and output currents. A resolution
to your problem can help further our understanding of how these things work.
?
I had to replace the VFD on my dust collector. It was an ABB ACS310 single phase input feeding a 3 phase 5 HP motor. This was from Oneida and because of the single phase supply they set the max current at the limit of the drive which is below the amperage
of the motor. Anyway the new drive, an ABB ACS310 5HP 3 phase input VFD, faults with my utility delta 3 phase supply. The fault is due to uneven current on the input. I¡¯ve spent hours measuring and testing and worked with ABB tech support several times. The
key test ABB had me do was to swap two wires to see if the low current moves. It does not so ABB said not the drive. But they did approve a warranty swap. With the replacement I see the same problem. With leg A I get 20A leg B 15A and leg C 19A. Leg C is the
wild leg. The voltages under load for legs A and B are within 0.2V. I also had the utility out and then measured and said all good on their side. They did not put a scope on the lines to see is I have phase shift issues. Could a phase different between the
lines cause a 20-25% current difference when the voltages are the same? ?Also I have notices that the current difference changes. Worst was tonight with 22A, 14A, and 20A.?
also I have two other 3 phase machines that run and the currents measure the same on all three legs for those machines. I also tried running the VFD with a new breaker and also on a different line. ABB agreed to swap the drive because the currents are the same
on all legs with non-VFD machines. ?
the only thing I can think of is the phase angles between the three legs is not 120 degrees. HELP
|
Joe Jensen
imran
JP Rice
Bill Belanger
