Expanding on Janner's thought:
I work on some lines, and built a hot press, that the PLC and HMI were powered from an external 120V source from the shops circuit breaker panel.
Some lines needed clean power and the 480 in the panels were causing problems due to rectifiers, VFDs, servo controls, ultrasonic generators, etc. The press I did because if the power dropped during a press cycle the process cycle could continue if the power came back on before the temperature or pressure dropped too much, so the PLC had its own 120 and a decent size UPS.
I work on some lines, and built a hot press, that the PLC and HMI were powered from an external 120V source from the shops circuit breaker panel.
Some lines needed clean power and the 480 in the panels were causing problems due to rectifiers, VFDs, servo controls, ultrasonic generators, etc. The press I did because if the power dropped during a press cycle the process cycle could continue if the power came back on before the temperature or pressure dropped too much, so the PLC had its own 120 and a decent size UPS.