[amsat-bb] Re: G-5500 problem
Alan P. Biddle
APBIDDLE at UNITED.NET
Fri Dec 11 03:30:48 PST 2009
Another reason not to put the capacitor in the rotator is that it is exposed
to large temperature swings, which will definitely shorting its life.
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of i8cvs
Sent: 10 December, 2009 19:51
To: AMSAT-BB; Paul Baldock
Subject: [amsat-bb] Re: G-5500 problem
Hi Paul, KW7Y
To put a critical component like an electrolitic Bi-Polar capacitor
inside the G-5500 rotator is a very bad idea from Yaesu because if
the capacitor shorts out then it is necessary to dissable the antennas.
You are fortunate enought that your capacitor only looses capacity.
Much better is the old KR-500 with it's capacitor inside the control
By the way.....problem solved !
----- Original Message -----
From: "Paul Baldock" <pbaldock at verizon.net>
To: "i8cvs" <domenico.i8cvs at tin.it>; <amsat-bb at amsat.org>
Sent: Friday, December 11, 2009 2:06 AM
Subject: Re: [amsat-bb] Re: G-5500 problem
I think I have confirmed that the problem is the
motor capacitor. I have connected a 47uF Bi-Polar
Cap across the motor connections in the shack,
which is effectively across the 100uF up at the
motor (unless a limit switch opens), and all
seems to be working in both directions now.
At 03:30 PM 12/10/2009, you wrote:
>Thanks for your thoughts.
>The current is about 2A when stuck or moving. (Same in both directions)
>I can get it to move if I up the voltage a little
>with a series transformer. Nominal voltage is
>about 28V in the shack. By adding 10V it moves
>fine. So temporarily I will add a series voltage
>to "kick start" it, until the wx warms up and I can service the rotor.
>- Paul KW7Y
>At 01:31 PM 12/10/2009, you wrote:
> >Hi Paul, KW7Y
> >I suppose that you measure:
> >Between A6 and A4 for CCW = 4.4 ohm
> >Between A6 and A5 for CW = 4.4 ohm
> >I suggest you to put an AC ammeter 5 Amps f.s. in series between the
> >common terminal A6 of the control box and the wire coming up to A6
> >in the motor.
> >In this condition the AC current running CW or CCW must be about
> >the same.
> >If the current increases when the motor stuks in CW position then there
> >is a mechanical problem inside the rotator.
> >If the current is low when the motor stucks in CW position probably the
> >capacitor C 35 losted capacity and if the current is zero probably the
> >limit switch SW-7 inside the rotator is defective.
> >Unfortunately if the AC capacitor C35 = 100 uF AC wich is connected
> >between A4 and A5 inside the rotator losted capacity you cannot measure
> >its capacity from the shack.
> >The motor is a brusheless AC asyncronous motor using the starting
> >capacitor C 35 to produce a 90° phase shift between both windings.
> >73" de
> >i8CVS Domenico
> >----- Original Message -----
> >From: "Paul Baldock" <pbaldock at verizon.net>
> >To: <amsat-bb at amsat.org>
> >Sent: Thursday, December 10, 2009 3:22 AM
> >Subject: [amsat-bb] G-5500 problem
> > > I have a G-5500 that sometimes will not turn clock wise(CW) but will
> > > turn counter clockwise (CCW) OK. When it is working OK in both
> > > directions each winding (CW and CCW) measures about 4.4 Ohms in the
> > > shack. When it will not turn CW that winding measures about 2.2 ohms
> > > (The CCW winding still measures 4.4 ohms).
> > >
> > > The Controller is fine, so the problem is in the motor.
> > >
> > > Does this motor have brushes?
> > >
> > > Any thoughts on what the problem might be?
> > >
> > > Thanks
> > >
> > > - Paul KW7Y
> > >
> > > _______________________________________________
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