Can I give 400VAC supply to the motor rated of 415VAC?

Anonymous user · ‎2020-06-06

MikaelKrantz · ‎2020-06-08

Have to say that a motor may be out of my knowledge, but many times you could check in the datasheet, the nominell voltage for the supply if given, but also a procent over and under voltage that they specify.

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Delcho_Penkov · ‎2021-03-15

Hello, yes you can. If the motor is specified at 415V but you use it at 400 this is 3.6% lower value. For the same load power the motor will take higher current, to compensate for the lower voltage, but it is reasonable, and the motor can operate continuously. Motors can tolerate ~10% voltage variation, if nothing else is specified. Also, let's not forget that often motors are over-specified for the application and in fact do not run at full power, meaning its current will actually be lower than rated.

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MikaelKrantz · ‎2020-06-08

Have to say that a motor may be out of my knowledge, but many times you could check in the datasheet, the nominell voltage for the supply if given, but also a procent over and under voltage that they specify.

Delcho_Penkov · ‎2021-03-15

Hello, yes you can. If the motor is specified at 415V but you use it at 400 this is 3.6% lower value. For the same load power the motor will take higher current, to compensate for the lower voltage, but it is reasonable, and the motor can operate continuously. Motors can tolerate ~10% voltage variation, if nothing else is specified. Also, let's not forget that often motors are over-specified for the application and in fact do not run at full power, meaning its current will actually be lower than rated.