New member here. I will try to include any info that I think relevant in this initial post. My employer has a 1989 Wasino lathe with a Fanuc A068-6044-H742 AC spindle servo unit. The spindle braking has not worked properly for several years and has now regressed to the point that I have to ramp rpm down in 250 rpm steps and dwell 5 seconds between steps to slow spindle rpm down from any speed over about 400 rpm. If I do not do this, spindle drive will shut down with Alarm 2 after 4-5 seconds of attempting to brake. This shutdown occurs in both low and high range. Alarm 2 is (Speed is deviated from the command value due to overload or other) according to the drive manual I have. I have experienced no problems with the spindle accelerating up to speed in forward or reverse nor have I noticed any lack of power. I also spent the last 2 weeks double lead single point threading with no repeatability issues which makes me assume that I do not have an encoder or speed sensor problem. I am hoping that someone on this forum will be able to narrow down what part of the drive I need to look at. I am just an programmer/operator and the only "tech" experience I have is from doing what I can to try to keep our old machines going for the last 20 years so my knowledge of electronics terms and such is fairly limited. I know, in a perfect world, this drive would just be replaced with a rebuild but the cheapest rebuild found so far was almost $8000. I understand going in, that even if we can determine what components are bad, we may just find the next weak link in our 33 year old electronics. Thanks in advance to anyone who reads this book and is able to offer assistance.