incremental encoders 1

[cn100]

at the moment encoder reference is taken straight off back of motor which is 1024 counts. this motor must be replaced and the new one has no encoder. provision is available on output of existing gearbox for mounting an encoder on site which is 1800 counts per rev. what is procedure for scaling new encoder counts and co-efficient formula. have never done this before. a&b channels only are used straight back into plc. would appreciate some general ideas.
thanks
cn100

 

[blacksea]

You must take into account gear ratio of gearbox. But answer you may find from PLC manual - looking for "encoder resolution", "encoder configuration" or other command like that.

 

[thinker]

Also make sure that your PLC frequency counter has a sufficient bandwidth to handle a higher pulse count.

 

[blacksea]

thinker: if gear ratio higher than 1800/1024, than encoder pulses frequency with motor encoder was be higher (!) with the same output shaft speed.