Alan .204 | 21/08/2013 19:31:32 |
304 forum posts 14 photos | We have just got our new machine all cleaned up and ready to go but now we are pondering on the best way to run it, it's three phase and we only have 240 the motors could be rewired to run of inverters but there are three of them 1hp-and .75hp and .5hp can you run three motor's of one inverter? we don't need variable speed as the machine is a surface grinder, do we go for a phase converter advice please, just been shouted for my tee.
Regards Alan. |
Robbo | 21/08/2013 19:42:14 |
1504 forum posts 142 photos | For ease of use, and as you don't need the facilities of a VFD, then a phase converter would be the way to go. And you can use it for other machines you may get, whereas the inverter would be dedicated to one machine/motor. You can run more than one motor from a VFD(inverter), by wiring them piggyback fashion, but they both run at the same time, and I think trying it with 3 motors is too much. Hope you enjoyed you tea (Facebook and Twitter intruding here)! Phil |
Alan .204 | 21/08/2013 20:18:35 |
304 forum posts 14 photos | Thanks Phil that's pretty much what i thought but thought I had better ask in case there was something else I didn't know about.
Al. |
Alan .204 | 21/08/2013 22:24:01 |
304 forum posts 14 photos | Hi Phil I don't know what size phase converter to look for to run these motor, what size KW converter do you think I should look for, I'm wondering if it would need to be a bit bigger in order to start the older type motors, what do you think, by the way I haven't found out yet how you convert KW in to HP.
Al. |
roy entwistle | 22/08/2013 08:03:02 |
1716 forum posts | 746 KW is 1 HP Roy ( or it was at Worsley Tech 65 years ago ) |
roy entwistle | 22/08/2013 08:44:04 |
1716 forum posts | Slip of the old grey cells 746 W = 1 HP It's allowable at 80 Roy |
Les Jones 1 | 22/08/2013 08:49:35 |
2292 forum posts 159 photos | Roy. Les. |
Trevorh | 22/08/2013 09:05:50 |
![]() 316 forum posts 89 photos | Kw x 1.341 = HP
regards |
Robbo | 24/08/2013 09:58:08 |
1504 forum posts 142 photos | Well done Roy, I am happy to see that I am not alone! Have always used rule of thumb that 750 watts equals 1 HP, near enough for our purposes and easier to reckon for the more elderly like Roy and I. Converters usually have a lower and upper range of output/ motor size in HP/watts, so I should reckon on one with the total motor HP (2¼ HP,- about 1700 watts Fractional horsepower motors, especially older ones, never translate HP to watts exactly, I have found. Phil Don't know how that smiley got in there, it's supposed to be close bracket, but it won't go away. Edited By Robbo on 24/08/2013 09:58:51 Edited By Robbo on 24/08/2013 09:59:44 |
Russell Eberhardt | 24/08/2013 10:08:59 |
![]() 2785 forum posts 87 photos | Posted by Robbo on 24/08/2013 09:58:08:
Don't know how that smiley got in there, it's supposed to be close bracket, but it won't go away. Just put a space in front of the close bracket symbol. Russell |
The Merry Miller | 24/08/2013 10:27:56 |
![]() 484 forum posts 97 photos |
Trevorh, Are you sure about that Trevor?? Len. P.
|
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