Subject: RE: Trouble at BCS start up
Date: Wed, 14 Nov 2001 11:34:13 -0600
From: "Kaufman, Tom" <Tom.Kaufman@mts.com>
To: "'pcastald@atc.army.mil'" <pcastald@atc.army.mil>, "Larson, Rod"
     <Rod.Larson@mts.com>

Pat:  I am looking for a catalog for the switch.  I will get back to
you.  Tom K.

> -----Original Message-----
> From: pcastald@atc.army.mil [SMTP:pcastald@atc.army.mil]
> Sent: Wednesday, November 14, 2001 10:40 AM
> To:   Larson, Rod; Kaufman, Tom
> Subject:      RE: Trouble at BCS start up
>
> Tom or Rod,
> I was checking this out again today.  Over night low was 27 deg F and
> temp
> dial gage  on reservoir reads 45 deg F.  Without starting the pump - I
> reset
> interlocks and turned on pilots and the system immediately aborted on
> the
> oil over temp.  I also noticed in the message log that it aborted on
> Sat at
> 4:00 am, I had left the program running.  Is it possible that the
> connections to the thermostatic switch are some how inverted and I
> just need
> to physically switch something? I noticed there are two thermostatic
> switches on the reservoir one seems to be connected to the coolers and
> the
> other I assume is the interlock.
> -Pat
>
> -----Original Message-----
> From: Rod Larson [mailto:rod.larson@mts.com]
> Sent: Wednesday, November 07, 2001 5:42 PM
> To: pcastald@atc.army.mil
> Cc: Tom Kaufman
> Subject: Re: Trouble at BCS start up
>
>
> Pat,
> There is NO low limit in the software.  What is happening is for some
> strange
> reason, the temperature switch that normally indicates overtemp is
> somehow
> firing when you turn on the pump cold.  I can tell you how to cheat
> this;
> however, you MUST reset the condition after it runs or it will shut
> off
> later.
> If this really is a problem, we must do something to disable this
> during
> cold
> weather.
>
> What is happening is that the digital input for over-temp is switching
> after
> you
> start the pump.  It can be disabled in the following fashion:
>
> 1. Go to the listener panel:  (Found under Service Menu Bar on top of
> main
> panel).
>
> 2. In the service window, type the following and hit the enter key:
>
>     vm.overtempDI.setPolarity[high];
>
> 3. This will flip the polarity of the overtemp switch and might enable
> the
> machine to start.  Of course, when the signal becomes ok, then it will
> estop
> and
> you will have to set the polarity back to low:
>
>     vm.overtempDI.setPolarity[low];
>
> I think the polarity is now low on start-up, but I am NOT 100% sure.
> You
> might
> have to try low 1st then high.  You can determine this by typing the
> following
> BEFORE you change polarity:
>
>     vm.overtempDI.value.writeln;
>
> The system will answer TRUE or NIL.  If TRUE, then the input is low,
> if NIL,
> then the input is high and you know the normal state.  So, you 1st
> have to
> set
> the abnormal state to get started and then revert later.
>
> I don't like this that the pump is doing this - it should NOT happen.
> I
> know
> the filters will do this as pressure is applied, but we don't have an
> e-stop
> condition from that.  Overtemp is a real bad thing if it is REAL.  I
> will
> research the temperature sensor and see what is going on.
> Rod Larson
>
>
> pcastald@atc.army.mil wrote:
>
> > Tom, Rod,
> >
> > I had a little trouble getting started yesterday morning. When I
> tried to
> > turn on pilots I would get a system shutdown on "HPS oil over temp
> (estop)".
> > I was trying to go to pilots right away because of drift problem
> when we
> > don't.  The overnight temperature was about 35 deg F and the ambient
> > temperature was 45 deg F. I finally got it to work after 16 tries
> and once
> > it warmed up it ran fine.  Is there a low temperature limit in the
> software
> > and can we adjust it?
> >
> > -Pat
