The baseblock fault appears when the the machine is in a state where it is not permitted to rotate. This is an input into one of the S1-S8 terminals on the inverter. Check your schematic to see which terminal is your baseblock input. This will typically be a terminal that has normally closed relay contacts leading to it. The following has been pulled from a Yaskawa manual to help verify that you are dealing with a baseblock error.
|LED Operator Display||Minor Fault Name|
|Drive output interrupted as indicated by an external baseblock signal.|
|External baseblock signal entered via multifunction input terminal (S1-S7).||Check signal to the baseblock input for your inverter.|