Elevator Control

* Input/output block All internal signal processing in PLC has voltage levels of 5VDC and 15VDC (voltage for TTL and CMOS) while external control signals can be much larger typically 24VDC to 240 VDC with large currents. The input/output block acts as a communication circuit between the PLCs ...

- Adjust the power supply frequency to the motor using thyristor or transistor frequency converters. The disadvantage of asynchronous motors is that when the grid voltage drops, the starting torque and the critical torque will decrease a lot because the torque is proportional to the square of the ...