3 phase AC to DC Converter

nowdays the converters are made so that it can be used in both 50/ 60 Hz frequency .so for more details see your device specification/ mannual . if it is quite too old Probably you cannot . Almost all the AC to DC converters are made for spefied AC Frequency in old ones. if try it may burn. because this happned to me . if you are well in power electronics and you may try changning the interal electronics components.

You have not mentioned whether it is electronic type such as rectifier or rotating converter (like motor)? Anyway if it is electronic one nothing going to happen either giving 50Hz or 60Hz. But if it is rotating/motor generator type then it MAY have problem of excessive heating up not again it will reduce the efficiency by at least 30%. Imported motors/generators are having 60Hz where as few countries standard frequencies are of 50Hz. These problems are arising very frequently and in this regard we are having experience of early death of motors.

Hi Workflow,

I am afraid that I must disagree with your statement;

"Imported motors/generators are having 60Hz where as few countries standard frequencies are of 50Hz."

If you check the list of Mains Power Systems around the world you will find that by far the majority of countries use a 3 phase 50 Hz supply with voltages between 220/380 and 240/415 V phase to neutral/phase to phase.

Outside of North America and parts of South America you will find the 50 Hz it the norm rather than the exception.

Hi

If your ciruit have transformer and then rectifier comming into picture means no harm to giving 50Hz. Because all 60Hz design transformers have capacity to work with 50Hz also but we cant able to use 50Hz transformer in 60Hz supply, Because it may cause Core saturation.

So dont worry even due to your present connection the life of your system will get increase, no harm things will happen. All the best.

Thak You,

K.P.Mahalingam,

Electrical and Electronics engineer.

India.

Your motors will run faster and hotter, watch your overload settings.

Your DC system will perform with 20% Lesser capacity

Hello Sir,

Can you tell me the make and model of this converter and what its total capacity is?

Best regards,

MichaelLDelaney@gmail.com

hello anand

if u r using an electrical motor as a conerter then u will have a problem of uniform output

coz, the output of ac motor wil depend on the frequency u apply on. so u will have reduced speed, which will reduce ur fixed output.

but if u use an electronic convertor then u need 2 add any step up frequency device 2 operate ur equipment. if the certain frequency is not supplied 2 the device u r going 2 operate then there may b chances of damage, burns etc.,

u can also change ur circuit, as per ur requirment

if u r a genius in P.E

regards

priyanka.k

Dear priyanka.k,

Participating in CR4 threads is both rewarding and admirable, however, you will find that most serious CR4 contributors frown on the sort of bastardized English that you have used in your post #8. It might save you a few seconds when you type it, but, it slows down the 4000 odd people that read it a lot more and as a result it ends up as a gross waste of time.

What's this dropping of capital letters all about? It takes exactly the same amount of time to type "If" as it dose to type "if".

Personally I find this sort of abbreviated language annoying, selfish and a sign of laxity that I normally don't even bother to read. If you wish to have your posts taken seriously and not waste your time then please, put in that little extra effort and type it in properly. It really dose make a difference and you look and sound so much more professional.

Sincerely yours

MASU

Dear Anand

From your msg. I have understood (a) Convertor is designed for 480 V 3 ph., 60 Hz. (b) Convertor is AC to DC.

If (b) is correct then how are u using it for AC drive, since the convertor output is DC.

For AC drive, the conversion is AC-DC-AC. On the output side, Voltage as well as frequency applied to the AC motor is changed to suit the desired speed requirement.

But if you have an AC drive then, normally using 50 or 60 Hz. on the input side will not have any impact on the output performance because, in AC drive, the AC input is rectified ONLINE ( without transformer etc. ) and then again converted in AC.

Thanks

Ashok Toshniwal

<AC to DC converter for AC drives, but if i am giving a supply >

Do you mean:

You have a device whose nameplate says" Input =480V 60Hz 3φ, Output= variable frequency 3 phase feed to motor speed Control "

If so, 50Hz Input will work almost as well as 60Hz. Nothing to worry about.

If it is a diode bridge rectifier, input frequency is irrelevant.