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A question about the applicability of PAC3I and PAC8000 products to high-altitude areas

I only saw a description about the product's operating temperature in the manuals of Pac3i and PAC8000, but what I want to ask is whether high altitude areas have any impact on our products. Where can I find this relevant information?

Jack.Zhang
  • Steve Ward
    Altitude limits are defined by standards like IEC 61131-2. For PLCs, the altitude limit for operation is 2,000m. Above this equipment needs de-rating as the lower air pressure means that heat is not dissipated as well as at lower temperatures. Thermal derating of 1 degree C per 305m above 2000m is recommended to take into account the lower density of the atmosphere and its ability to remove heat from the system. So for example at 3,000m, the maximum temperature would be reduced from 60 degrees C to 56.73 degrees C for PACSystems RX3i and from 70 degrees C to 66.73 degrees C for PAC8000.
  • Jack.Zhang

    In reply to Steve Ward:

    Thank you Steve. Your help has been invaluable. I now have a project that needs to be implemented at an altitude of 4000 metres. I'm planning to use either the full PAC3I range or a combination of PAC3I 400CPU and PAC8000 IO. I would like to know if the PAC3I LT wide temperature range can help to avoid some potential problems. After all, it seems that the PAC8000 might be more suitable. At the moment, I'm more concerned about potential problems with the PAC3I in this environment.
  • Steve Ward

    In reply to Jack.Zhang:

    So at 4,000m, the maximum temperature has to be reduced by about 7 degrees C. LT versions don't help for altitude as they don't do anything at the maximum temperature, only the lowest temperature (LT means tested to operate at -40 degrees C). However altitudes are associated with low temperatures (ie if you're at the top of a mountain it's usually colder than at sea level), so LT would help for this.

    PAC8000 already has a -40 to +70 degrees C temperature range and the CPE400 has the same temperature range. PACSystems RX3i has a standard temperature range of 0 to 60 degrees C.

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