text: <s>[INST] PF753 does not start Summary: PF 753-755 drive does not respond to start/rev commandHi, We have a PF 753 drive (20F11ND077AA0NNNNN) and it does not respond to Start or Reverse command. Below is how the parameters are set and inputs are wired. Param 158 DI Stop: Port5: Dig In Sts.Input 1 Param 161 DI Start: Port5: Dig In Sts.Input 0 Param 162 DI Reverse: Port5: Dig In Sts.Input 2 When we enable Stop and Start inputs, drive STS indicator LED turns to flashing green, HIM module shows rotation indication F but drive does not respond to commanded speed. And when we enable stop and reverse, rotation indication still shows F instead of R. What can cause it? One weird thing I have noticed is, although this is supposed to be a 753 drive, the main control board is:SK-R1-MCB1-PF755 (this is not a brand new drive and not sure who programmed it before). And it is using a 22-series I/O card: 20-750-2262C-2R. How compatible is 755 main control board on a 753 drive? [/INST] Someone before you made a frankenstein drive. Since it has the PF755 main control board, it will behave like a 755, even though the control pod has only 3 slots available, not 5. That said, it shouldn't matter for the way you're trying to use it. Question 1: Have you verified your input wiring by looking at port 5, parameter 1 (input status)? As you trigger inputs 0, 1, and 2, you should see their state change in port 5 parameter 1. Question 2: What is the source of your speed command? Is it wired correctly and have you verified it by looking at the appropriate parameter? You might look at the diagnostic parameters for Port 0 - 930 to 936. If you are 100% certain your physical setup is correct, then the simplest thing to do is factory-default the drive and start from a clean slate, especially because you say someone else programmed the drive previously. The only way to do this is via the HIM (CCW will NOT reset the drive). See page 318 of the PM manual: https://literature.rockwellautomation.com/idc/groups/literature/documents/pm/750-pm001_-en-p.pdf \\n </s>