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thanks steve, i m getting a vfd to aid me on it. does the vfd normally, bundled wif its communication board? the board that allows the inverter to communicate with PLC> so if i get to use ge fanuc lm90, to comuncate wif teh inverter by omron, there is an interface it need to work out rite>> i got this optional mvodule that inside the manual rs-422/485 for the communicating part , is this module necessary since, i m using ge fanuc plc to communicate wif teh inverter instead of omron? i came from reading the manual please enlighten me sir, thank u for your time and attention :) haf a nice day!

ok. using open loop, configuration, would it be possible not to fry the PLC OR the motor if i m to use the control scheme of PLC --->PWM----> 3phase induction machine with less than 1hp without any other supporting devices such as starters . the PLC has a build in feature of PWM for pulse outputs. thanks again

actual posting ndescriptions using LM90

howdy every1 :) i m back :) concerning the above doubt, whats is the disadvantage of using a open loop position control modules to control the position of a indcution machine as compared to closed loop? as far its concerned, open loop doesnt need any feedback from the motor it is controlling and the controller ASSUMES the motor is actually obeying its signal. controlling the position here simply makes the rotor turns to a specific angle in the ID. p/s: i assumes it still communicates throught a PWM because, i need to use the PWM to control the speed of the ID. i m using LM90 any advices /suggestions will be much appreciated and thank u in advance

ok thank santiago i will figure something out at the moment. will reply again when i got prob thanks man :))

thanks for your useful advice. i m now at a holiday and i plan to start finding resources now rather than wait till my semsester starts,. btw the possition i will double confirm from my prof. thanks again for your advice and the books u recommend , man Respect

ok the cost is not a matter at the moment but.. this control of induction motor had already existed in the past. in my thesis, i m to control the speed, position, started and brake of teh motor bvy means of pLC. according to wat i came /r3ead acrosss in books, this method is cabpabpel to be very accurate and economical. and fast as well this project thesis is using PLC theory and dealing with induction motor -inverter fed control in 1 package design. the project is on hardware programming and implementation just to obtain a simple outcome result of speed, position and fast breake control for the induction drive. task 1) programming the PLC on PC to give the right and the wanted signal to the inverter 2)implement the hardware drive action for the motr control any1 please offer some advice on how should i start and where should i start plz thank a milliona :respect:

hi santiago, is it possible to control the speed of of a motor using a PWM? PWM = pulse width modulator i presume PWM is a type of inverter corrrect me if i m wwrong. btw i need some words of advices if its feasible to control a motor's speed, thru a pwm, using PLC. thanks buddy :Respect: