sogoatticus
Member
Im currently doing a project to control a speed of an ac motor..after designing the circuit i noticed that the PLC must me a dc input n output..can anyone help in adjusting the circuit?
rsdoran said:Why not tell the truth? You have a school assignment of some kind that you have to determine how to do, there is no way you are controlling an AC motor's speed with the circuit you supplied.
Some single phase AC motors can be reversing and/or multispeed but the circuit you have shown could only reverse direction for A DC motor i.e. not enough wiring involved for AC.
There is nothing about the circuit you provided that would allow speed control of either AC or DC, and could be damaging to the motor if used.
sogoatticus said:its not an assignment..its a project
sogoatticus said:i've already know how to control the speed of AC motor using multiple resistor and variable frequency
sogoatticus said:..but the problem is i dont know how to connect it to PLC as the PLC use Dc input.
Do not connect hot directly to the PLC. Connect a 24DC supply to the PLC to run the relay. Connect the hot to the relay.sogoatticus said:..as i stated im also using relay..
im not sure which wire (hot,neutral,ground) to connect to the plc...
sogoatticus said:Im currently doing a project to control a speed of an ac motor
sogoatticus said:for the motor im using 240vac(stated on the motor) which is a washing machine motor..
sogoatticus said:maybe im asking too much here
sogoatticus said:the PLC is in the univ lab..im not sure what brand..but i remembered it uses the syswin software..
Stationmaster said:"Give a man a fish..........