Did some more trouble shooting this morning and was able to clear the brake switches. I found that the "LB" relay is not picking, therefore the brake switch fault appears.
The "LB" relay seems to be controlled by the drive board. The drive is actually faulting out showing "M421" then "!04A" I have no idea what these codes are. There's a soldered relay "relay 2" on the drive board that has one N/O contact looking pitted, don't know if it has anything to do with the brake circuit.
Everything seems to be pointing to a defective drive board. The drive model is ACA2129OBJ2. Unitec wants to sell us the complete drive $10K,not just the board.
Any input or guidance is appreciated.
