Re: [foxboro] FW: CP40A FT Double Failure
- From: "Doucet, Terrence" <tdoucet@xxxxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 3 Oct 2008 10:47:19 -0400
Andrew,
The 40 overruns in a week, with Total CPLOAD below 50% is a little
weird.
Are the control phases balanced?
Do you have sequence blocks? If, yes, perhaps you can put the CPLOAD and
FBCSCAN into your historian to see if there is a peak when sequence
blocks run. Even if you have no sequence blocks, historising these
parameters and finding out when they peak, might help you associate the
time when something else is happening in your plant.
Terry Doucet, Eng.
I've had a look and since I replaced the CP40A a week ago we've had 40
over runs.
With regards the installation this hasn't been touched in a long time -
all the connectors seemed ok when I replaced the CP40A when they failed.
The loading is about 42% and the total control cycle (% of BPC) is below
50% for each cycle
I'll check the fieldbus connections and let you know
thanks for your time
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