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IEC Motor
- Thread starter timm333
- Start date
If it's a new IEC motor from Europe then it should be plated at 400V and capabale of operating on any supply between 380V and 415V without exceeding design limits. If it is an Italian motor then it will probably catch fire at 415V. If it is a Chinese motor it will probably melt. ![[smile]](/data/assets/smilies/smile.gif "[smile] [smile]")
Any chance of a photo of the nameplate?
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If we learn from our mistakes I'm getting a great education!
Any chance of a photo of the nameplate?
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If we learn from our mistakes I'm getting a great education!
ScottyUK is right but obviously has a bias against Italian motors. They work fine, they tend to go out on strike a lot...
(Hey, I'm mezzoitaliano, I have the right to bash my own. But the rest of you do not![[wink]](/data/assets/smilies/wink.gif "[wink] [wink]")
)
The 415V vs 440V issue is different. Motors need the proper V/Hz relationship. If you have a 415V 50Hz motor, you have a V/Hz ratio of 8.3:1 and as long as you are within 10% of that you should be fine. So if you have 440V 60Hz supply (doubtful, but a separate issue) you would have a V/Hz ratio of 7.33:1 and that is outside of that 10% window.
If, as is more likely, the supply is 480V 60Hz then the ratio is 8:1 and well within acceptable for a 415V 50Hz motor. it will run faster and put out more HP. but will run fine.
Read this FAQ; faq237-1224
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(Hey, I'm mezzoitaliano, I have the right to bash my own. But the rest of you do not
)The 415V vs 440V issue is different. Motors need the proper V/Hz relationship. If you have a 415V 50Hz motor, you have a V/Hz ratio of 8.3:1 and as long as you are within 10% of that you should be fine. So if you have 440V 60Hz supply (doubtful, but a separate issue) you would have a V/Hz ratio of 7.33:1 and that is outside of that 10% window.
If, as is more likely, the supply is 480V 60Hz then the ratio is 8:1 and well within acceptable for a 415V 50Hz motor. it will run faster and put out more HP. but will run fine.
Read this FAQ; faq237-1224
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> faq731-376
timm333,
YES.Since you seems to be from IEC world,your nominal system voltage should be 400 V. That means your transformer no-load voltage should be 415 V. That means your motor with name plate voltage of 380 V should be able to operate even at 415V which is +10% of name plate voltage.
YES.Since you seems to be from IEC world,your nominal system voltage should be 400 V. That means your transformer no-load voltage should be 415 V. That means your motor with name plate voltage of 380 V should be able to operate even at 415V which is +10% of name plate voltage.
Kiri,
That depends a little on how new the motor is. If it is more than about 10 years old it could a straight 380V motor in which case it would suffer from over-fluxing at 415V.
As an aside, anyone who has a legacy 415V system rather than a true 400V system should be very careful if they as using ATEX certifed motors in a hazardous area because a 415V system running near slightly above nominal voltage may well exceed the limits for which the certification is valid. This cost a colleague's project a fair amount of moeny because we have a 415V system which runs slightly high, and we had to replace a load of 400V motors.
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If we learn from our mistakes I'm getting a great education!
That depends a little on how new the motor is. If it is more than about 10 years old it could a straight 380V motor in which case it would suffer from over-fluxing at 415V.
As an aside, anyone who has a legacy 415V system rather than a true 400V system should be very careful if they as using ATEX certifed motors in a hazardous area because a 415V system running near slightly above nominal voltage may well exceed the limits for which the certification is valid. This cost a colleague's project a fair amount of moeny because we have a 415V system which runs slightly high, and we had to replace a load of 400V motors.
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If we learn from our mistakes I'm getting a great education!
karalahana
Electrical
overfluxing and aging? can u pls explain more detailed the relationship if u dont mind..
There's no relationship other than one created by politicians.
The European Union passed legislation which decreed that the nominal voltage throughout Europe would be 400V, and the tolerances were set to allow legacy 380V and 415V systems to continue to operate until assets such as distribution transformers were replaced. Older industrial sites running private distribution networks are still largely operating at 415V.
Modern European LV motors have to be able to operate, without derating, over the full voltage range. Older machines made specifically for 380V and without regard to possible operation on a 415V supply are unlikely to have sufficient iron in the core to avoid saturation at the higher voltage. By similar reasoning, older machines designed for 415V service without regard to possible operation on a 380V system may well struggle to produce rated torque and may stall at the lower voltage.
Hope that clears things up for you.
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If we learn from our mistakes I'm getting a great education!
The European Union passed legislation which decreed that the nominal voltage throughout Europe would be 400V, and the tolerances were set to allow legacy 380V and 415V systems to continue to operate until assets such as distribution transformers were replaced. Older industrial sites running private distribution networks are still largely operating at 415V.
Modern European LV motors have to be able to operate, without derating, over the full voltage range. Older machines made specifically for 380V and without regard to possible operation on a 415V supply are unlikely to have sufficient iron in the core to avoid saturation at the higher voltage. By similar reasoning, older machines designed for 415V service without regard to possible operation on a 380V system may well struggle to produce rated torque and may stall at the lower voltage.
Hope that clears things up for you.
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If we learn from our mistakes I'm getting a great education!
According to IEC 60034-1 FIG.12 if the frequency stays in 50-51 Hz limits 380 V rated induction motor may work up to 399 V continuously[Zone A] and up to 418 V [Zone B] intermittently.
In the same conditions 415 V rated may work up to 435.7 V continuously and up to 456.5 intermittently.
See:
In the same conditions 415 V rated may work up to 435.7 V continuously and up to 456.5 intermittently.
See:
Australia decided to follow the Europeans and standardise the voltage from 415 to 400 volts. In practice absolutely nothing changed and the phase - neutral voltage remains at 240 volts. The only change made was that the tolerances on the voltage in the Australian Standards was moved from 415 + - 10% to 415 +10% -6%.
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