Remove old Micromaster 440 after interrogating with laptop and Siemens starter software, fit new Micromaster 400 Inverter and connect up and program.
After a machine move we got asked to look at a webster bennett control panel and main motor, the motor had been making a horrible noise and not running poroperly. After an hour it was diagnosed that the A1 and A2 had been reversed on the wires going to the motor and this had caused one of the motor hrc fuses to blow. Three new fuses and correctly wired and the unit ran fine. The control panel was integral to the machine and built by Square D in 1964.
This motor is an 11kW and has been running at around 12.35kW for quite a few years now, the motor is suffering from overheating and the terminal box wiring clearly shows signs of this. the extra kW are costing in the region of £800 a year in excess electricity. The motor wiring will not last much longer.