text: <s>[INST] Synchronization (motion) between three motors using 3 PowerFlex 525 VFDs and 3 encoders? Summary: 05BH00CB02AF encoders motion synchronizationI am trying to setup the motion tracking of a large platform using three motors controlled by three VFDs. These motors have to move at the same pace and be 100% synchronized otherwise the platform will break or the motors will get damaged. The drives are PowerFlex 525 with one encoder on each motor communicating with the encoder on the VFD. The encoder is 05BH00CB02AF. I am wondering what is the best way to sync the motion of these motors? and how to have safety check in place to stop the motion if one motor goes out of sync? I haven't seen the parameters from the encoders yet, but just wanted to check if Rockwell provides any modules that can handle motion synchronization? [/INST] You can't do this with 525 VFDs by themselves, but you could with 755s and some encoder splitters. In this scenario, one of the 3 motors would be the master and you would give speed commands to it. The other two motors will be slaves. The slaves will need two encoder cards (one for its encoder, one for the encoder signal coming from the master. The master encoder signal needs to go to the master drive and the two slaves, so you will need two encoder splitters to get three separate signal paths. Alternatively, you could use the PF755s and a single encoder card each, and also a CompactLogix processor capable of motion control - a 1769L30ERM or a 5069-L310ERM for instance. This eliminates the need for the encoder splitters and gives a lot more capability to the system, but at higher cost. I'm very partial to the compactlogix motion control approach. Going cheap on the application you describe will cost you in the end. 525 drives are not up to the task. \\n </s>