alkv23 Posted August 8, 2006 Report Share Posted August 8, 2006 Hi guys im doing m/c installation. We bought the m/c from korea. In malaysia we using 415v but the m/c need 3 phase with 220v so i need to use transformer. I have 2 unit 5kva transformer. The sec amp is 7 and the pri amp is 14amp. Now i want to ask u all, the m/c circuit breaker is 30amp. So can i use 1 transformer to run 2 m/c????????. Plz guide me. Quote Link to comment Share on other sites More sharing options...
Theatronics Posted August 8, 2006 Report Share Posted August 8, 2006 I am guessing that ‘M/C’ means Motor Control.It also sounds like you are dealing with 3 phasePower so the motor control you are talking aboutMust be a fairly hefty one. What concerns me is not the 30A rating ofThe controller but the current demand of theMotors you plan on using. At 220V with 7AYou can expect around 3-4 Hp or 1500W(Note: I just rounded, I did not compensate for3 phases or power balancing)If the motor is under that range then you should not have a problemThe transformer can only provide up to 14 amps max, and if theMotors only draw 14A max then the 30 rating of the controllerShould be a blessing as it can easily handle the load.The one thing that you did not make clear is the type ofTransformer you have. I am guessing you have a step downTransformer to drop from 415 down to 220. I have not encounteredA large number of 3phase transformers that make such a smallStep. Usually I see 13,800V down to 220. I was worried that youHad a single phase transformer and you wanted to get 3 phasePower from it. Quote Link to comment Share on other sites More sharing options...
alkv23 Posted August 9, 2006 Author Report Share Posted August 9, 2006 Thanks for you reply Theatronics. What you said is true, this machine have 3 main motor. 1 is 2hp motor and 2 more is servo motor. I think the hp is less then 0.5 because its small motor. Now i have 2 unit of machine that bought from korea. The power supplt is 220v 3 phase. I have 2 unit stepdown transformer. From 415v 3 phase down to 220v 3 phase. Now i just want get idea from u all is't suitable me to use 1 unit transformer to run 2 unit of machine??? and can someone explain me how to culcalate kva to amp????? for example 5kVa transformer can use for homy many amp machine or motor????????? Quote Link to comment Share on other sites More sharing options...
prateeksikka Posted August 18, 2006 Report Share Posted August 18, 2006 the circuit you connect to the transformer draws its own current according to its resistance .but this 15 A which u are talking about is the transformer rating.2 coils connected in parallel!!!!god knows what interferences come !and how much current it drws.moreover always keep a safety factor!so better run only one M/C on it. Quote Link to comment Share on other sites More sharing options...
alkv23 Posted August 21, 2006 Author Report Share Posted August 21, 2006 Yes ur right and i did what you said. Now i use 1 transformer for 1 m/c so now all running in good condition and the amps also low. I just want to save cost but in safety wise not good. Anyway thanks guy. If anyone can teach me how to culcalate amps???????? Quote Link to comment Share on other sites More sharing options...
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