SEW Eurodrive issues

[Claes99]

Hey all, The company I work for runs 3 palletizers with big SEW motors (DFV132M4) to operate the lifts. One of the machines went down last night and we believe it is the brake gone bad. The rectifier in the control box on the motor is a BGE 1.5, and it is controlled by a Movidrive down in the box. The lift wouldn't jog up or down and we would constantly receive a lag error every time we tried to move the lift. This happened once before with a different machine of ours and it turned out to be the shaft inside the encoder that had broken. We inspected the encoder on this one and it is fine and everything is in one piece. We metered out the voltage going to the panel, and then the voltage going to the rectifier in the control box on the motor and it was getting the same in as it was putting out. So after that we decided to Pull apart the motor to see what the brake looked like and it looks fine to me (although I haven't ever looked into one before). The pad wasn't worn down, and the components inside look to be in good shape. The eurathane ring that protects the electromagnetic coil in the brake is a dark reddish brown color on about half the ring, while the rest is still a beige color. Is there anything that you guys can think of that we can test to see if it really was the brake that went bad after all? If the coil was malfunctioning would the brake constantly be applied or would it be retracted always. I understand the basic concept of the brake but would have no idea how it would act if something went wrong in the coil. I appreciate any feedback. If you have any questions feel free to ask and I will answer the best I can. Thanks