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 |
|---|
 | bb | Baseblock |
| Drive output interrupted as indicated by an external baseblock signal. |
| Cause | Possible Solutions |
| External baseblock signal entered via multifunction input terminal (S1-S7). | Check signal to the baseblock input for your inverter. |
