Onil Fillion
New Member
Morning guys. Need some help / advice.
I have a Larco 30 T crane with a binding problem. It all has to do with the bridge drive brakes. It used to happen often after you release the paddle on the Cattron remote; the crane coasts for a short distance and then binds on the tracks. The tracks are perfectly straight; we recently had them straighten, surveyed and approved.
We know it it's one of the bridge drive's brake that is locking in prematurely. Or, when the brakes are suppose to kick in after 15 seconds or so of coasting one brake engages like they should and the other doesn't. No faults in the Magnetek drive. Both drive motor brakes are adjusted the same at approx. 0.015" gap. So, I figured it must be the contactor(s) sticking or something and yes, they were in really bad condition so we replaced them; didn't make a difference. The magnet coils in the motors either work or not and they do so I then thought of the rectifiers in the SEW motors as they control the brakes. We installed new rectifiers in both motors and it solved the problem. No more binding until last night; it started doing it again. Ran great for 1 week. This crane runs pretty much 24/5 non-stop.
Not sure yet if the new rectifiers are defective again but if they are, what is causing them to fail? There's only one Magnetek drive that control both contactors / motors. Could the problem be something else?
I have a Larco 30 T crane with a binding problem. It all has to do with the bridge drive brakes. It used to happen often after you release the paddle on the Cattron remote; the crane coasts for a short distance and then binds on the tracks. The tracks are perfectly straight; we recently had them straighten, surveyed and approved.
We know it it's one of the bridge drive's brake that is locking in prematurely. Or, when the brakes are suppose to kick in after 15 seconds or so of coasting one brake engages like they should and the other doesn't. No faults in the Magnetek drive. Both drive motor brakes are adjusted the same at approx. 0.015" gap. So, I figured it must be the contactor(s) sticking or something and yes, they were in really bad condition so we replaced them; didn't make a difference. The magnet coils in the motors either work or not and they do so I then thought of the rectifiers in the SEW motors as they control the brakes. We installed new rectifiers in both motors and it solved the problem. No more binding until last night; it started doing it again. Ran great for 1 week. This crane runs pretty much 24/5 non-stop.
Not sure yet if the new rectifiers are defective again but if they are, what is causing them to fail? There's only one Magnetek drive that control both contactors / motors. Could the problem be something else?