[amsat-bb] Re: G-5500 stuck problem

wa6fwf wa6fwf at sbcglobal.net
Thu Jan 1 18:42:15 PST 2009

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.

Kevin WA6FWF

----- Original Message ----- 
From: "Greg D." <ko6th_greg at hotmail.com>
To: <mail at hatzakis.net>; <amsat-bb at 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

More information about the AMSAT-BB mailing list