This week’s post is a bit left field, but it’s something that causes more confusion than it probably should.
Every so often we get a call from a customer who’s just installed a machine and it doesn’t seem to be behaving properly — motors running the wrong way, no hydraulic pressure, no coolant flow, or a CNC machine throwing an alarm that doesn’t really point to anything obvious. In a lot of cases, the machine is actually fine and the issue turns out to be incorrect phase rotation at the power supply.
To help save time, frustration, and unnecessary downtime, we’ve put together a short, practical guide on checking three-phase rotation. It applies to both conventional and CNC machines and explains what to look for before assuming there’s a fault with the machine itself.
