Re: [foxboro] Motor Start/Stop Logic

We use the FBM just like a field start-stop-light.  Two outputs ... one
driven by COUT_1 is momentary on, one driven by COUT_2 is momentary off ..
and 1 input for motor status.  Sometimes we'll use another input for some
auxiliary data, like vibration.  It seems so easy to me, I don't know why
you'd want to complicate it with all that other stuff.

  local DCS    local   motor
   stop stop   start    coil
---|/|--|/|--|--| |--|--(M)--|---
             |       |       |
             |  DCS  |  run  |
             | start |  ind  |
             |--| |--|--(X)--|
             |       |
             | motor |
             |  aux  |
             |--| |--|


Brad Wilson
ExxonMobil Chemical Co
Edison Synthetics Plant
732-321-6115
732-321-6177 fax
Brad.S.Wilson@xxxxxxxxxxxxxx


                                                                           
             "Burnham, Rob                                                 
             C."                                                           
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             foxboro-bounce                                                
             @freelists.org                                        Subject 
                                      Re: [foxboro] Motor Start/Stop Logic 
                                                                           
             01/24/06 01:21                                                
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             foxboro@freeli                                                
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We don't because we send it to a PLC input so
we can have Ready To Run indication and overload
indication.

Are you using a seperate contact for running feedback
to your DCS?

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of
brad.s.wilson@xxxxxxxxxxxxxx
Sent: Tuesday, January 24, 2006 11:10 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Motor Start/Stop Logic


I must be missing something in all this.  Don't you all use the =
auxiliary
contacts built into the motor starter to hold in the starter?

I don't see any operational deficiencies in either GDEV or MTR.
The only improvement I might make would be to transition the AUTDSR back =
to
0 if the motor didn't start.
That way you wouldn't have to toggle AUTDSR twice (off, then on again) =
to
try restarting the pump.

Brad Wilson
ExxonMobil Chemical Co
Edison Synthetics Plant
732-321-6115
732-321-6177 fax
Brad.S.Wilson@xxxxxxxxxxxxxx

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