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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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3phase motor running on one phase
Hi.
I have 11kw 3 phase motor controlled by variable frequency drive ( siemens micromaster). The drive can be powered with one phase ( with little pcb change ) and it can give 3 phase output. So i was thinking to connect one phase to the drive to see how much power can i get on motor side. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? Regards ! |
#2
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3phase motor running on one phase
h200 wrote: Hi. I have 11kw 3 phase motor controlled by variable frequency drive ( siemens micromaster). The drive can be powered with one phase ( with little pcb change ) and it can give 3 phase output. So i was thinking to connect one phase to the drive to see how much power can i get on motor side. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? No. TANSTAAFL. |
#3
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3phase motor running on one phase
On Oct 5, 3:54*pm, h200 wrote:
Hi. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? Regards ! Not sure I understand what you are asking. A three phase motor can be run on a single phase and will deliver about 2/3 the power it would have on three phase. And you can do this without any variable frequency drive. But you have to have a way to get the three phase motor to rotate. I would not recommend using a VFD to run a three phase motor. I suspect it would ruin the VFD and maybe also the motor. Depends on how fast the circuit breaker acts. Do some searches on " phase converter. Dan. |
#4
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3phase motor running on one phase
h200 wrote: Hi. I have 11kw 3 phase motor controlled by variable frequency drive ( siemens micromaster). The drive can be powered with one phase ( with little pcb change ) and it can give 3 phase output. So i was thinking to connect one phase to the drive to see how much power can i get on motor side. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? Regards ! Either 2/3 or full power depending on the drive. It should say what it's rating is on single phase input in the specs. |
#5
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3phase motor running on one phase
wrote in message ... I would not recommend using a VFD to run a three phase motor. I suspect it would ruin the VFD and maybe also the motor. Depends on how fast the circuit breaker acts. Bath salts ? |
#6
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3phase motor running on one phase
On Fri, 5 Oct 2012 14:23:47 -0700 (PDT), "
wrote: On Oct 5, 3:54*pm, h200 wrote: Hi. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? Regards ! Not sure I understand what you are asking. A three phase motor can be run on a single phase and will deliver about 2/3 the power it would have on three phase. And you can do this without any variable frequency drive. But you have to have a way to get the three phase motor to rotate. I would not recommend using a VFD to run a three phase motor. I suspect it would ruin the VFD and maybe also the motor. Depends on how fast the circuit breaker acts. Do some searches on " phase converter. Dan. Dan, you know better. VFD drives are almost exclusively used to run three phase motors. Perhaps responding to political posts has warped your mind. Or maybe you are just "taking the ****" as folks say on the other side of the pond. Eric |
#7
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3phase motor running on one phase
"PrecisionmachinisT" fired this volley in
: Bath salts ? GOTTA be. I run several machines in my shop on VFDs, because POWCO "don't deliver no three wires" to my locale (that's a quote). Lloyd |
#8
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3phase motor running on one phase
On Oct 5, 6:04*pm, wrote:
I would not recommend using a VFD to run a three phase motor. *I suspect it would ruin the VFD and maybe also the motor. *Depends on how fast the circuit breaker acts. Do some searches on " phase converter. * * * * * * * * * * * * * * * * * * * * * * * * * * * Dan. Dan, you know better. VFD drives are almost exclusively used to run three phase motors. Perhaps responding to political posts has warped your mind. Or maybe you are just "taking the ****" as folks say on the other side of the pond. Eric I do know better. I am a slow typist and often get my thoughts way ahead of what I have typed. In this case, I meant " I would not recommend using a vfd to run a three phase motor on one phase." Three little words left out and the whole meaning is changed. I have a three phase motor on my lathe and use a VFD to power the motor. Also got a 3 phase bench grinder recently and am going to use a VFD on that too. Dan |
#9
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3phase motor running on one phase
On Fri, 05 Oct 2012 21:54:44 +0200, h200 wrote:
Hi. I have 11kw 3 phase motor controlled by variable frequency drive ( siemens micromaster). The drive can be powered with one phase ( with little pcb change ) and it can give 3 phase output. So i was thinking to connect one phase to the drive to see how much power can i get on motor side. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? Regards ! The average VFD, on single phase... will deliver about 75-80% of the rating of it being run on 3phase Gunner The methodology of the left has always been: 1. Lie 2. Repeat the lie as many times as possible 3. Have as many people repeat the lie as often as possible 4. Eventually, the uninformed believe the lie 5. The lie will then be made into some form oflaw 6. Then everyone must conform to the lie |
#10
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3phase motor running on one phase
On Fri, 5 Oct 2012 14:23:47 -0700 (PDT), "
wrote: On Oct 5, 3:54*pm, h200 wrote: Hi. My question would be, how to calculate maximum horsepower or KW used by 3 phase motor, if he is be connected to 220 / 50 HZ - 8KW source ? Can he run on half of the power or maybe 6 - 7kw ? Regards ! Not sure I understand what you are asking. A three phase motor can be run on a single phase and will deliver about 2/3 the power it would have on three phase. And you can do this without any variable frequency drive. But you have to have a way to get the three phase motor to rotate. I would not recommend using a VFD to run a three phase motor. I suspect it would ruin the VFD and maybe also the motor. Depends on how fast the circuit breaker acts. Do some searches on " phase converter. Dan. Most...not all..but most VFD manufactures approve of running them on single phase, with the caveat that they do drop at least 25% of their capacity when doing so. Gunner The methodology of the left has always been: 1. Lie 2. Repeat the lie as many times as possible 3. Have as many people repeat the lie as often as possible 4. Eventually, the uninformed believe the lie 5. The lie will then be made into some form oflaw 6. Then everyone must conform to the lie |
#11
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3phase motor running on one phase
wrote in message
... On Oct 5, 6:04 pm, wrote: I would not recommend using a VFD to run a three phase motor. I suspect it would ruin the VFD and maybe also the motor. Depends on how fast the circuit breaker acts. Do some searches on " phase converter. Dan. Dan, you know better. VFD drives are almost exclusively used to run three phase motors. Perhaps responding to political posts has warped your mind. Or maybe you are just "taking the ****" as folks say on the other side of the pond. Eric I do know better. I am a slow typist and often get my thoughts way ahead of what I have typed. In this case, I meant " I would not recommend using a vfd to run a three phase motor on one phase." Three little words left out and the whole meaning is changed. I have a three phase motor on my lathe and use a VFD to power the motor. Also got a 3 phase bench grinder recently and am going to use a VFD on that too. Lots of VFDs out there that document using single phase in 3 phase out. I have three motors in my shop configured that way. Drives Warehouse even lists one that only has connections for single phase and its rated for a full 5HP. (About 3.7Kw) What I have not seen is a VFD rated for single to three phase for more than 3.7kw. The OP says 11Kw. That is one big honking motor. |
#12
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3phase motor running on one phase
On Fri, 5 Oct 2012 17:10:53 -0700 (PDT), "
wrote: On Oct 5, 6:04*pm, wrote: I would not recommend using a VFD to run a three phase motor. *I suspect it would ruin the VFD and maybe also the motor. *Depends on how fast the circuit breaker acts. Do some searches on " phase converter. * * * * * * * * * * * * * * * * * * * * * * * * * * * Dan. Dan, you know better. VFD drives are almost exclusively used to run three phase motors. Perhaps responding to political posts has warped your mind. Or maybe you are just "taking the ****" as folks say on the other side of the pond. Eric I do know better. I am a slow typist and often get my thoughts way ahead of what I have typed. In this case, I meant " I would not recommend using a vfd to run a three phase motor on one phase." Three little words left out and the whole meaning is changed. I have a three phase motor on my lathe and use a VFD to power the motor. Also got a 3 phase bench grinder recently and am going to use a VFD on that too. Dan Greetings Dan, I use a VFD on my band saw. The saw came with a single phase motor but I replaced it with a three phase motor and a VFD. So now I can cut steel and aluminum with the same blade without changing belts. Eric |
#13
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3phase motor running on one phase
Gunner wrote:
The average VFD, on single phase... will deliver about 75-80% of the rating of it being run on 3phase Some VFDs are set up to alarm if they don't have all 3 phases. Most under 10 KVA will run on single phase input. If you load them to 100% rating on single phase it can damage the rectifier and will certainly shorten the life of the capacitor bank (unless the manufacturer has specifically over-designed these parts to permit full power on single phase.) Some people recommend a 50% derating for single phase, but I think your 75% is a good number for typical shop use, where the 75% rating is rarely needed. I have a 1 HP rated VFD on my 1 HP Bridgeport, and it has run perfectly for over a decade. I got this before I knew about the derating issue, but I'm getting away with it in light home-shop use. Jon |
#14
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3phase motor running on one phase
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#15
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3phase motor running on one phase
"Paul Hovnanian P.E." fired this volley in news:ef-
: The beauty of a VFD is that they DO allow the use of three phase motors where only single phase is available. Better efficiency and starting characteristics, not to mention the speed control feature. Since PowCo won't install "three wires" (their quote) to my shop, that's how all my three-phase equipment runs. It's WAY cheaper than a rotary converter. LLoyd |
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