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Thank you RamConsult I am afraid that it is an electrical problem, as all your suggestions that you have made have been attended to and all is in order mechanically. Hi Burnt2x now I know. Thanks once again. Who wants a coffee in a pub? Jemjack.

Oh dear have I stirred up a hornets nest here? Thanks anyway.

Hi Burnt2x, Thank you for taking such an interest in my problem. I am afraid that my electrics are a bit too rusty to remember how to calculate power factor or even how important it is. So would be most grateful if you could enlighten me a bit and tell me what affect this has on the motor not...

Hi burnt2x, Sorry, your jpg. Is exactly what my circuit is, I got very muddled up before. But when I traced your circuit to mine, I found that they were exactly the same, so thank you very much for your help, at least now I know that the motor is correctly wired up. Best wishes Jemjack.

I am hoping not to change the motor, and the supplier is sending me a new 400µf condenser in case that is the problem, if not I will send the motor back, as I think that it could be faulty from all the advice that everyone has sent to me. The VFD idea is certainly the best, but very much more...

Once again thanks for all your help, I am now in a good position to tell the company that I bought the motor from that there is most likely a problem with the centrifugal switch of the motor. Or at least that the motor is not working as it should. I have checked the tachometer with various other...

Jemjack Thanks very much everyone, I have not mixed up my numbers, but the tachometer is an old mechanical one. And reads on the 1 to 10000scale so I agree that it could be a bit out. Also when I said that the motor was off load reading 2900 rpm, it did in fact have a rather heavy cast iron 3...

Hi Waross, and Lionelhutz, Thank you for answering my questions, the motor is brand new. I am using the same pulleys as the 3 hp motor, so the 4 hp motor should run with no problem. The motor voltage is 220 volts on the plate, and the supply voltage is 220 volts sometimes it drops to 215...

Hi Burnt2x and everyone else who has been so helpful, The motor was under load from the compressor when the rpm reading of the motor was 2500 rpm. A few days ago I tried the motor without the belts, and it ran perfectly, starting correctly and running at 2900, at 215 volts. I suspect the...

Hi waross, that’s what I thought, but this defiantly is both coils left in circuit. Thanks burnt2x for all your information, luckily I am only filling to 150 ats most of the time, and I can do that in about 15 mins which is ok for me. The motor ran today, see below at 2500 rpm, so the compressor...

Hi everyone thanks once again, yes the motor is wired for the correct voltage, thanks. I haven’t got a torque curve for the motor, but the specification is,3 kw 4 hp 18.2 Amp 2820 rpm, fp cos? 0.95, rend 79% ,ppc (nm) 79, Pa 2, PMa 1.7 1a ipc 7 wt 23.2 Kg, Is this any help? Carlos, the...

Thank you very much for all your help, I will check the voltage at the meter when starting up, though I think that it may well be the same, as well over 50 amps is asking a lot. The compressor defiantly does not have an unloader problem, as it worked with the 3 HP motor before, (which was an...

I have a high pressure compressor for filling air cylinders for diving, and a little while ago I asked about 5 hp motors for it, and got many helpful replies from you , thanks very much. I did have a mental block, as when I read the blurb a bit more carefully I saw that it really only required a...

Hi everyone who wrote in to help me with my problem horse power for the compressor, You have given me plenty of food for thought, so now I should be able to solve the problem one way or another. Thanks very much, jemjack

Hi The Blacksmith, Is what I meant was that if the compressor requires 5 hp to drive it at 1300 rpm, would a 4 Hp motor be happy (not overheat) if it drove the same load at 1000 rpm? Thank you Skogsgurra So it would not be a good idea to buy a 3hp motor from Spain, rated at 220 volts 50 hz to...

Hi , Thank you both for your posts, the compressor is a high pressure breathing air compressor, up to 200 ats, but I do not use it above 150 ats. Used for filling air cylinders for scuba diving. 1 option I don’t think that starting currents would be a problem, as the compressor starts with no...

I have a compressor which requires 5 hp, here in Spain the highest power single phase motor I can buy is 4 hp. At the moment I have a 3 hp motor driving it, but it is underpowered and the motor overheats and cuts out. Can I put 2, 3hp motors together with drive belts to the compressor so that I...