When does the CIOC High Temp Alarm come in?

Hi Everyone !   Long time listener, first time poster... oh, OK, I've posted many misguided questions here before.  It has just been a while.

I'm looking for the temp that will trigger the CIOC MAINT_ALM hardware alarm.  My BOL tells me it will be when it's "too high or too low."  My spec says 158 F is the operating limit and InternalTemp is getting a bit close. 

I will offer 125 community points for the correct answer....wait.. what?  We don't do community points?!! Jim, what have you been doing!!  :)

Absent an answer I will try the BAKE setting on my oven and report back.  I'm just concerned about the accuracy of the oven thermostat.

-Travis

P.S. I'll deduct 25 points if the answer is in Celsius.

  • -4 F to 176 F (or -20C and 80C)
  • , I love your enthusiasm! We are currently working on some new gamification features for the EE365 community...stay tuned for more details. In the interim, let's honorarily award with those 125 bonus points. :)

    Best Regards,

    Rachelle McWright: Business Development Manager, Dynamic Simulation: U.S. Gulf Coast

  • In reply to ekilkenny:

    To clarify, these are the limits applied to the CIOC temperature reading, which is the internal temperature on the card.

    We've done some testing here in Calgary and have data from three customer CIOC's. These have a wide range of CHARMS installed but the result is pretty consistent. The Ambient temperature around the CIOC runs between 19.6 and 21 degrees cooler than the internal diagnostic temperature. So the alert an -20 coincides with an ambient of -40 Deg C, and the alert at 80 occurs around 60 Deg C ambient.

    On my CHARM panel installed outside, over the last 3 years, the offset has been very consistent at 20.5 deg C even at -30 Deg Air temperature and +35 Deg C.

    I strongly recommend not to install a temperature sensor in these outdoor panels because the internal temperature is more than adequate to indicate ambient are in the cabinet. But also, since there we don't install any active cooling, there isn't really anything to monitor the temperature for. In regular cabinets, with fans, we would monitor temperature as an indication that fans failed and internal air temperature was above the expected controlled value. In a remote panel, temperature swings with the ambient temperature, and if the sun hits the panel, this can add 10 to 12 Deg C via radiant heat. If its a sunny day, and warm, hitting 60 deg C might be normal. If its only 10 degrees C at night, and the alarm goes off, something is wrong. I'm thinking the built in Hardware alert is adequate for high temp.

    If the panel has a heater for low temperature extremes, you might want to set an alert if the temperature goes below -20 as the heater may not be working. if there's no heater, no need to set a low temperature alert.

    We recommend displaying an inferred ambient temperature to the Operator by subtracting the offset. The temperature profile from the internal temp follows ambient with a bit of delay, but is very repeatable.

    Andre Dicaire

  • In reply to Andre Dicaire:

    As always Andre you are superb! The offset information will help. Yes, we have the "fan fail" or "room AC fail" problems to worry about down in Los Angeles. I was able to use CIOC-xxx\INTERNALTEMP parameter on an Operate screen and add it to a Process History View graph even though it's not in the SELECT list when you browse for it, but when I try to add it to a module as an Output Parameter\External Reference for alarming, or add it as a History Parameter on the CIOC it tells me it's not a valid parameter. Any clues to how I might grab it?
    DeltaV 11.3.1.
    Thanks!!!
    -Travis
  • In reply to Travis Neale:

    The Temp and voltage diagnostics are only available on workstations. You have to run the diagnostic module for the alert on an App station, or the Pro Plus.

    Andre Dicaire

  • In reply to Andre Dicaire:

    Thanks Andre!