text: <s>[INST] PF40, Lift Application, Free-Fall..... We're using a PF40 for a lift application. There is a carriage driven up and down with a chain and sprocket system, and a counter balance to help with the weight differential. We loaded up the carriage with extra weight (more than what the application would call for), and as we were commanding down, we got into a free fall scenario. I hit an e-stop, and the brake grabbed the shaft and we were safe. So If I command a frequency to this drive, and it can't handle the load, what is going on here? We didn't get a over voltage on the bus, because it would have faulted the drive and the brake would have kicked in.... We're using FWD, REV commands, using the comm port to command frequency. Any help would be appreciated. [/INST] You need a true torque control drive to handle this application. The PF40 is not capable of producing torque at 0 speed so the load goes into freefall before it can take control of the load. You should use a PF700VC drive, it actually has a torque proving application where it controls the brake and will verify the brake is holding before disengaging the drive. \\n </s>