voltage

Does anyone know the specs of the Echo (pre-Sierra) electronic speed controller, in particular, if it can tolerate 7s Li-ion input voltage? I contacted Dive Xtras but the person replying did not know. I opened the ESC heat shrink wrapping but no identifying information.

Hi. We have a 400V 50hz 3-phase compressor (2.2KW). Can this be run of a 230v supply with the use of an inverter drive? As I understand the inverter drive will maintain the voltage and frequency ratio; so a "400v 50hz" motor will run fine at "230v 29hz", but with somewhat less rpms.