Motor control circuit e.g. for power station - uses large scale printed circuit board for up to three KW at five hundred V allowing rapid replacement

摘要

The application is to motor controls produced in large numbers for identical applications, for example soot blowers in thermal power stations. The separate wiring of controls, for example overcurrent relays, timers, lockout devices, pole changing relays and the like is eliminated by making a printed circuit plate with all necessary power and light current connections. The components are then mounted directly onto the plate without wire connections and the whole connected into the motor supply. Wiring errors are eliminated. In the event of failure the whole board can be quickly replaced thus the motor down time is reduced.