Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.crafts.metalworking
|
|||
|
|||
RPC and electric motor gurus
Ive got a southbend Fourteen lathe. It has the variable speed pulleys that go to a two speed transmission. It has a 200 volt 3phase baldor motor. Baldor say that it is rated for +- 10% on voltage. I am using a 5 hp idler with no caps running off of 220 If I try to start the motor in high the motor starter on the lathe chatters before it finally stays engaged. Low speed starts fine. But the motor gets hot after about 10 minutes of running( you cane keep your hand on it for about 10 seconds before it gets uncomfortable) any recommendations of what I should do. Thanks Bill |
#2
Posted to rec.crafts.metalworking
|
|||
|
|||
RPC and electric motor gurus
Probably should not try and start anything much over 2hp with a 5hp
idler. Assuming this is not a purpose made phase converter idler motor, you really need to check the phase currents and adjust them with running caps. Also, make sure the power for the lathe motor control contactor is not on the developed phase. I built a 15hp converter two years ago and it's been working nicely, but it uses running caps to balance the phase current. Bill wrote: Ive got a southbend Fourteen lathe. It has the variable speed pulleys that go to a two speed transmission. It has a 200 volt 3phase baldor motor. Baldor say that it is rated for +- 10% on voltage. I am using a 5 hp idler with no caps running off of 220 If I try to start the motor in high the motor starter on the lathe chatters before it finally stays engaged. Low speed starts fine. But the motor gets hot after about 10 minutes of running( you cane keep your hand on it for about 10 seconds before it gets uncomfortable) any recommendations of what I should do. Thanks Bill |
#3
Posted to rec.crafts.metalworking
|
|||
|
|||
RPC and electric motor gurus
On 13 Feb 2006 02:24:35 GMT, Ignoramus8228
wrote: On Sun, 12 Feb 2006 18:18:07 -0600, Bill wbbright@amaonlinecom wrote: Ive got a southbend Fourteen lathe. It has the variable speed pulleys that go to a two speed transmission. It has a 200 volt 3phase baldor motor. Baldor say that it is rated for +- 10% on voltage. I am using a 5 hp idler with no caps running off of 220 If I try to start the motor in high the motor starter on the lathe chatters before it finally stays engaged. Low speed starts fine. Aside from everything, make sure that your starter (contactor) runs off the utility legs, sounds like it runs off leg3. i Iggy .... that was it. leg 3 was wired in to the contactor |
#4
Posted to rec.crafts.metalworking
|
|||
|
|||
RPC and electric motor gurus
On 14 Feb 2006 11:53:20 GMT, Ignoramus21707
wrote: On Mon, 13 Feb 2006 22:08:00 -0600, Bill wbbright@amaonlinecom wrote: On 13 Feb 2006 02:24:35 GMT, Ignoramus8228 wrote: On Sun, 12 Feb 2006 18:18:07 -0600, Bill wbbright@amaonlinecom wrote: Ive got a southbend Fourteen lathe. It has the variable speed pulleys that go to a two speed transmission. It has a 200 volt 3phase baldor motor. Baldor say that it is rated for +- 10% on voltage. I am using a 5 hp idler with no caps running off of 220 If I try to start the motor in high the motor starter on the lathe chatters before it finally stays engaged. Low speed starts fine. Aside from everything, make sure that your starter (contactor) runs off the utility legs, sounds like it runs off leg3. i Iggy .... that was it. leg 3 was wired in to the contactor cool... what are you going to do with 200v issue? Does the motor perhaps have a standard NEMA frame? i Baldor says its good for +- 10% so that says 180-220v . so I am at the high end. I will run it for awhile and see what it does. It is a standard frame. Bill |
#5
Posted to rec.crafts.metalworking
|
|||
|
|||
RPC and electric motor gurus
On 15 Feb 2006 04:59:35 GMT, Ignoramus21707
wrote: On Tue, 14 Feb 2006 18:36:46 -0600, Bill wbbright@amaonlinecom wrote: On 14 Feb 2006 11:53:20 GMT, Ignoramus21707 wrote: On Mon, 13 Feb 2006 22:08:00 -0600, Bill wbbright@amaonlinecom wrote: On 13 Feb 2006 02:24:35 GMT, Ignoramus8228 wrote: On Sun, 12 Feb 2006 18:18:07 -0600, Bill wbbright@amaonlinecom wrote: Ive got a southbend Fourteen lathe. It has the variable speed pulleys that go to a two speed transmission. It has a 200 volt 3phase baldor motor. Baldor say that it is rated for +- 10% on voltage. I am using a 5 hp idler with no caps running off of 220 If I try to start the motor in high the motor starter on the lathe chatters before it finally stays engaged. Low speed starts fine. Aside from everything, make sure that your starter (contactor) runs off the utility legs, sounds like it runs off leg3. i Iggy .... that was it. leg 3 was wired in to the contactor cool... what are you going to do with 200v issue? Does the motor perhaps have a standard NEMA frame? i Baldor says its good for +- 10% so that says 180-220v . so I am at the high end. I will run it for awhile and see what it does. It is a standard frame. If it is a standard frame, you have freedom to do whatever you want, replacement 3 phase motors are dirt cheap... i Another question. will two 5 horse idlers start a 7.5horse? |
#6
Posted to rec.crafts.metalworking
|
|||
|
|||
RPC and electric motor gurus
I have a "5" hp RPC - it spins up and drives three transformers. The xformers
are held off until I want the higher voltage three phase. The peak inrush current is just over 50 amps. Naturally the 50 amp breakers hold up nicely. The transformers drive 6 three phase motors - 3 at the moment - So far so good. Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder Ignoramus7443 wrote: On Wed, 15 Feb 2006 00:59:09 -0600, Bill wbbright@amaonlinecom wrote: On 15 Feb 2006 04:59:35 GMT, Ignoramus21707 wrote: On Tue, 14 Feb 2006 18:36:46 -0600, Bill wbbright@amaonlinecom wrote: On 14 Feb 2006 11:53:20 GMT, Ignoramus21707 wrote: On Mon, 13 Feb 2006 22:08:00 -0600, Bill wbbright@amaonlinecom wrote: On 13 Feb 2006 02:24:35 GMT, Ignoramus8228 wrote: On Sun, 12 Feb 2006 18:18:07 -0600, Bill wbbright@amaonlinecom wrote: Ive got a southbend Fourteen lathe. It has the variable speed pulleys that go to a two speed transmission. It has a 200 volt 3phase baldor motor. Baldor say that it is rated for +- 10% on voltage. I am using a 5 hp idler with no caps running off of 220 If I try to start the motor in high the motor starter on the lathe chatters before it finally stays engaged. Low speed starts fine. Aside from everything, make sure that your starter (contactor) runs off the utility legs, sounds like it runs off leg3. i Iggy .... that was it. leg 3 was wired in to the contactor cool... what are you going to do with 200v issue? Does the motor perhaps have a standard NEMA frame? i Baldor says its good for +- 10% so that says 180-220v . so I am at the high end. I will run it for awhile and see what it does. It is a standard frame. If it is a standard frame, you have freedom to do whatever you want, replacement 3 phase motors are dirt cheap... i Another question. will two 5 horse idlers start a 7.5horse? In my RPC, one 10 HP motor easily starts a 7.5 HP idler (which is not loaded with any mechanical load). I had a test RPC at some point with a 7.5 HP idler, that started a 3 phase 5 HP Atlas Copco compressor. i ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|