[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Yaesu G5500 Rotor Woes



Hi Paul,
Separate the Rotors from secondary side of your Trafo and measure with a
Ohmmeter or other device from the begining the cable to Rotor if there is
any short in phath of el. or az. Motoren.
Then separate Trafo both from pimary and secondary side and measure if there
is a short in trafo?
And continue it till localize on which side could be the short.
Measur the control part and power part seperated so block for block.
This method can be used for all blocks without loop.
The initial position of the Rotor could be a reason for short as well if the
position is not within of the definition range(calibration) or dead zone it
draws huge current!
Good luck!
73 de Joubin DK1BJF


----- Original Message -----
From: "Steve" <jepsen_st@mindspring.com>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, August 12, 2002 4:16 AM
Subject: RE: [amsat-bb] Yaesu G5500 Rotor Woes


> Hi Paul,
> When I was in college I worked in a TV shop and we had a trick for finding
> shorts in TV's. We'd put a 100 watt light bulb in series with the power to
> the shorted
> TV. As long as the short existed The light was on but the fuse wouldn't
> blow. We
> could then disconnect different sections of the TV (with the power
> unplugged) until
> the light either went dim or out and we were able to isolate the shorted
> section.
> Steve .. AI7W
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of K5OE@aol.com
> Sent: Sunday, August 11, 2002 16:47
> To: pwillmott@northrock.bm; amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] Yaesu G5500 Rotor Woes
>
>
> Paul,
> Here is a common scenario:
> 1.  The elevation rotor fails (limit switch failure or whatever) and
causes
> the motor to short out (high temperature melts the insulation on the
> windings).
> 2.  This then draws excessive current (dead short, practically) and the
main
> transformer in the control box fails.
> 3.  This then, finally, blows the 10 amp fuse in the control unit.
>
> A good test of the box is to unsolder the 120 Vac leads to the transformer
> and then see if the fuse blows.  If not, then disconnect the low-voltage
> side of the transformer, reconnect the high voltage side, and test again.
A
> blown fuse now indicates the transformer is shot (but the rest of the box
is
> probably OK).
>
> After you replace the transformer, disconnect the rotor and see if all is
> OK.  You will now have to troubleshoot the rotors to find the real,
initial
> problem.  Reconnect the az rotor first and check.  Next the el rotor.
Good
> luck.
>
> 73,
> Jerry, K5OE
> ps:  put a fast-blow 5 Amp fuse in the box :-)
>
>
>
>
> In a message dated Sun, 11 Aug 2002 11:24:48 AM Eastern Standard Time,
> pwillmott@northrock.bm writes:
>
> >
> >
> > Hi Group,
> >
> > A week ago my virtual new (less than 1 year old), G5500 rotor stopped
> > working. In fact the fuse had blown, ... visible inspection of the
inside
> of
> > the controller shows no sign of burning etc, the cable looks fine, and
the
> > rotors themselves look ok, ... at the time of the fuse blow the rotor
> hadn't
> > been used for long prolonged use, ... its only used for AO40 and updated
> via
> > software only once per minute.
> >
> > Now the problem is that replacing the fuse doesn't help, ... every time
a
> > new fuse goes in it blows instantly, ... so I guess something has failed
> > short. The trouble is that without having the unit powered up its hard
to
> > find what is wrong.
> >
> > Has anyone else had this problem, ... or perhaps suggest a test
sequence.
> >
> > Thanks
> >
> > Paul, VP9MU
> >
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to
> > Majordomo@amsat.org
>
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>


----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home