text: <s>[INST] F100 on 4M When I was setting the communication parameters on one of the 4M drives (through the keypad), and after cycling power on the 480AC line to the drives, 1 off the drives was showing F100. (Parameter Checksum Fault). Forcing me to reset all parameters back to default, and then reenter them. What causes this fault! (or better, how can we avoid this). I don’t want my customer to have to do this, but remember having similar checksum problems on a GV300 systems years back. In that case the drives were on a DC bus and Rockwell claimed the problem was that the bus voltage dropped to quick.These drives are not on a DC bus.Guys, any thoughts here would be awsome! [/INST] Unfortunately it isn't documented a probable cause for this fault, just it is indicated to Restore Default Parameters and retry...It could be a random and false checksum error, but if it often reappears, then it is a true checksum fault and the drive will need to be replaced. - fuzzy logic \\n </s>