Encoder connection

Don't expect the system to work!!!

A+ and A- are complementary signals - when A+ is high, A- is low and vice versa. The same holds for B+ and B-. If you exchange A+ with B-, the decoding system will see a lot of ambiguous results (A+ high at the same time as B- high, etc.). It will not be able correctly to interpret the input pulses in terms of distance and direction.

Hello John,

Sorry, i made one mistake. I intended to say what will happen if i interchange A+ and B+. Can i run with reverse direction of motor.?

Swapping A and B will change the direction output of the encoder (as long as you swap A+ with B+ and A- with B- if you have them).

What effects this has on how the motor runs depends on your control system.

In this case if i chnage the direction of motor , will it run?

Sorry, don't understand what you're trying to do.

I want to say that if i interchange A+ with B+ (and A- with B-)....

in this case it should not run and drive gives fault.

but, if i change the phase sequence of AC motor , will it run?

I'd say yes, it should run (but I couldn't tell with 100% certainty without knowing a lot more about your system).

Is it a system which was running and which has been modified or repaired?

Try it, and if it doesn't work, swap them back again.

The forum still doesn't know what the intent of this change is, and cannot foresee the outcome in so far as the process integrity is concerned.

OK Thanks for your inputs . I will try the same.....

Did it work?

YES, the only way to change the direction of the motor is to switch two of the main wires, the encoder is only switched if you get an error or unstable operation at speed

you can change the wires and tell us the result what happened.Before doing this ,read manual of encoder or OEM manual.

People here have overlooked the very first statement by the OP. This is a closed loop system. If you reverse the direction of just the encoder direction or just the motor drive control you will have a positive instead of a negative feedback system. You must reverse polarity of both the motor and the feedback signal in a closed loop system or things will run away. If you have any limit switches for the motor travel then you must also get these to agree with the correct polarity selection.

Normally in closed loop the control command direction should correspond to the motor rotation and encoder feedback accordingly.

This means for the drive Forward must meet a direction of rotation (change motor phases if wrong) and (probably) +ive encoder feedback for this rotation.

Reverse will be opposite direction of all (obviously)

So, all three need to be matching.