Subject: RE: Another Bad Load Cell?
Date: Fri, 11 Jan 2002 14:05:41 -0500
From: pcastald@atc.army.mil
To: rod.larson@mts.com

Thanks Rod, I'll try this.  -Pat

-----Original Message-----
From: Rod Larson [mailto:rod.larson@mts.com]
Sent: Thursday, January 10, 2002 5:41 PM
To: pcastald@atc.army.mil
Subject: Re: Another Bad Load Cell?

Pat,
Here's a .alt file that will switch #5 to displacement control and track #6
stroke feedback. Put this file in GUI sub-directory w/ the other temp fix
files.

Rod Larson

pcastald@atc.army.mil wrote:

> Tom,
>
> I have swapped module's and every indication is that the problem is in the
> load cell.  I have re-soldered the connection at the load cell and the
> erratic and somewhat random signal continues to output from the load cell.
> So I guess we better order another one.
>
> I have some demos/briefings coming up next week and the week after.  I was
> wondering if Rod could help me apply the master slave patch so that no5
runs
> in displacement mode and tracks no6.  The Bridge Test Working group wants
me
> to be able to apply the master slave patch as a contingency if a load cell
> goes bad during the official durability testing. I think this is something
> doable over the phone or if Rod sets up the file I can start it up like we
> did when the other load cells were bad.
>
> Pat
>
>
>
> -----Original Message-----
> From: Kaufman, Tom [mailto:Tom.Kaufman@mts.com]
> Sent: Thursday, December 20, 2001 5:10 PM
> To: 'pcastald@atc.army.mil'
> Cc: Larson, Rod; Downer, Chuck
> Subject: RE: Another Bad Load Cell?
>
> Pat:  Yes, the load cells have a one year warranty.  Your warranty started
> on November 2, 2001, and will last until Nov. 2, 2002.  I think you are
> looking at the right items,  Any defect in the cable, or moisture in the
> connector, would show up when you swapped the cable.  Was the module also
> swapped, to rule out any possibility of a funky module?
> If the load cell is defective, after you check the solder joint, then let
me
> know and I will get a new load cell on order.  Tom Kaufman
>
> > -----Original Message-----
> > From: pcastald@atc.army.mil [SMTP:pcastald@atc.army.mil]
> > Sent: Thursday, December 20, 2001 2:55 PM
> > To:   Kaufman, Tom
> > Subject:      Another Bad Load Cell?
> >
> >
> > Tom,
> >
> > I've been away from the BCS for a week or two but when I returned to
start
> > up again I detected a erratic signal coming from Load Cell No 5.  (one
of
> > the ones we replaced previously). I swapped cables to verify that the
load
> > cell was the culprit.  Signal seems to randomly vary between 0 and +100K
> > lbs.(positive up) with a mean at about 40K. Have you ever seen this kind
> > of
> > thing before? Do the load cells have warranties? I will be out for two
> > weeks
> > over Christmas but when I come back the only thing I can think of doing
is
> > checking the solder connection inside the load cell  - we fixed that on
no
> > 15.- unless you have any other suggestions?
> >
> > Pat
