Phase converter problems usually show up as a converter or machine that won't start, a hum, a tripped breaker, a hot motor or one leg reading the wrong voltage. See what eight makers' troubleshooting guides say about each, what they call normal, and who checks what.
A phase converter runs a 3 phase machine on single phase power. See the three types, how a VFD compares, how a rotary converter makes power for the third wire, and what size you need.
A CNC can run on a rotary or digital phase converter when its maker allows one and the converter keeps the three legs balanced. Here's how to check your CNC maker's rules, pick a type and size it by each converter maker's published rule.
To choose a digital phase converter, check which design "digital" means, then size it from your machine's nameplate. See the hp and amp rule, a worked example, balance for CNC, and what to ask the maker before you buy.
A machine with its own VFD, such as a CNC mill or lathe, can often run on a rotary phase converter if the machine's maker allows it. See what to check first: voltage balance, converter size, the manufactured leg and regen braking.
American Rotary vs Phoenix phase converters side by side: each maker's sizing rule, voltage balance figures and warranty terms, from its own documents.
