Hi Greg, Actually you need to measure the current while it is moving, then if it drops a little then its a jam, if it goes to zero then its the limit switch.
I know this goes against reasoning, you expect a locked motor to pull more current, but these are split winding AC motors with a capacitor and they act differently.
This is also why when you get a cable snag you burn up the motor or the transformer or both before you blow the fuse, that fuse I think just saves you from a mis-wired or shorted cable.
73 Kevin WA6FWF
----- Original Message ----- From: "Greg D." ko6th_greg@hotmail.com To: mail@hatzakis.net; amsat-bb@amsat.org Sent: Thursday, January 01, 2009 5:58 PM Subject: [amsat-bb] Re: G-5500 stuck problem
To differentiate between a stuck gear or the limit switch (or similar), can you measure the drive current going to the rotor? If it goes up at the 180 mark, it's a jam; if it goes to zero, it's the limit switch.
Also, what does the controller's meter indicate? Maybe it's shutting it down for some reason.
Greg KO6TH