Today is...
Monday, July 24, 2017
Welcome to Control.com, the global online
community of automation professionals.
Featured Video...
Featured Video
A demonstration of EtherCAT control of linear motors using the CTC EtherCAT master.
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive
Inverter with Lower Voltage Motor
Using a 460v Inverter with a 400v motor

Hi,

We have a 460v Inverter (Mitsubishi) that is driving a 460v motor (variable speed fan). We would like to use this on a 400v motor. Is this possible? We appreciate that the inverter will need re-programming with the details of the new motor (voltage & current etc) but does anybody see a problem doing this?

Thanks

No problem. The inverter is the same, only the nameplate changes. Inverters, especially from Japanese companies, come in 3 "Classes": 200V Class, which covers 200-240V input; 400V Class, which covers 380-480V input, and 600V Class, which covers 550-690V input. There is often an overlap on the 600V Class that goes down to 480V, but in general most VFDs are OK with getting down to 50% of their rated voltage without problems.

Now, with a 400V source you will not be able to run your 460V motor at full speed, but you could still run it at around 87% speed. But if you are changing to a 380-400V rated motor when you have a 400V input, no problem at all.