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UPS for Magelis iPC

Goals and Symptoms


Conclusion from several Magelis iPC failure analysis demonstrated that improper selection or use of UPS could easily damage iPC and create failures.

The goal of this resolution is to provide direction for UPS selection (use of UPS must follow UPS user manual instructions).

Facts and Changes


For reference, we shortly explain here under the 3 different uninterruptible power supply (UPS) technologies:

  • Standby
    • The most frequently-used technology for protecting PCs in an office environment with little electrical interference.

      The PC is normally powered from the electrical network mains supply with no power conversion.
      Its operating principle is sequential (on mains/on battery).
      If there is a power failure or a drop or increase in voltage, the UPS takes power from its battery to provide a stabilized power source.
      Off-line technology is not suitable for use if there are frequent disturbances or high temperatures (industrial or rural environments).

      Advantages: low cost
      Drawbacks: the application is affected by all current fluctuations outside accepted tolerance limits

  • Line Interactive
    • Mid-range technology, for protecting single station servers in office environment

      It operates in the same way as an Off-line UPS.
      The UPS uses microprocessor control, monitoring the quality of the mains supply and responding to changes.
      A booster, (voltage compensation circuit), is activated in the event of an extended dip in voltage.
      Line interactive technology, as with off-line, is not suitable above 3 KVA.

      Advantages: it can alleviate extended drops in voltage
      Drawbacks: it does not provide complete protection

  • Double conversion
    • Top of the range technology, for centralised protection of servers, to guarantee a constant quality of supply, whatever the fluctuations on the mains.

      The On-line UPS only uses its batteries in the event of a power cut: the current is fully equalised by transforming the AC to DC, then back to AC again.
      This continuous double conversion process reduces the effect of any electrical disturbances that could damage a computer, thus providing fail-safe protection.
      It is essential to protect installations that are critical to the business, and to provide continuous protection.

Causes and Fixes


As a principle, the only technology that fits for Industrial PC is the double conversion.

According to functional and environmental tests, we strongly recommend to use UPS units from the MGE Pulsar EXtreme C range UPS to protect Magelis iPC.

The MGE Ellipse and Pulsar Evolution ranges are not satisfactory to work with Magelis iPC and may cause failure.

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