PaulKim1003 Posted July 16 Report Posted July 16 Hi everyone, I have four PowerFlex 755 drives, and one of them is behaving oddly. Its command speed is stuck at 40Hz and doesn't respond as expected. I've already checked the Max Frequency (parameter 37) and Speed Reference Select (parameter 545), and both appear to be configured correctly. Has anyone encountered a similar issue before or have any suggestions on what else to check? Thanks in advance!
Chris Elston Posted July 16 Report Posted July 16 Some things to check maybe: On Parameter 545 - make sure the correct source is selected. EIP, HMI, analog etc, that you want. On Parameter 361-372 - make sure preset SPEED is not selected. If DI3 is configured for preset speed it could be locking the FREQ. I think Parameter 79 is associated with this. also check drive speed limits. Parm 39,40, 42
ElectronGuru Posted July 16 Report Posted July 16 In addition to @Chris Elston's suggestions, check parameter 935 while you're running the drive to see what the drive *thinks* it's doing. Look to see if the status bits say it's accelerating/decelerating, at speed, or maybe a limit has been hit.
PaulKim1003 Posted July 17 Author Report Posted July 17 I had to reset the drive to default and re-program it. It is working fine now. Thanks for the help. @Chris Elston @ElectronGuru 2
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