Claes99

SEW Eurodive brake issues

3 posts in this topic

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 Tyler
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Definitely sounds like a mechanical problem keeping the motor from turning. That could be the brake or it could be something on the load side. I haven't worked with SEW much, but here's what to look for. If you have the motor apart, I guess that means you took it off the machine? Have you tried running it like that to make sure that the problem isn't in the load? Brakes are always power to disengage for safety. That way if you get a power failure the load won't move. With the motor on the bench (not connected to drive) you shouldn't be able to turn the shaft because of the brake. But if you put power on the brake terminals (usually 24V), then the brake should open and allow you to turn the shaft. If that test works, then verify that the drive is powering the brake when it's trying to run it. There is usually a relay between the drive and the brake since the brake will pull move power than the drive can supply, so check that as well.

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To add to that: 1.Brake voltage will be on the nameplate. SEW brakes are as likely to be AC as 24 vdc (400/230) 2. This is a squirrel cage induction motor? The brakes usually have a manual override lever. M10 bolt in the slot in the cowl works. Do not try this on the machine unless safe to do so.

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