in accordance with EN 50091-3, IEC 62040-3:1999 and VDE 0558 Part 530
The aim of classifying UPS devices according to their operating behaviour is to provide a common basis for assessing all manufacturer data. This enables users to compare products from different manufacturers with similar performance ratings from the same point of view.
(examples):
| VFI- | SS- | 111 |
|
The first group of letters describes the Influence of the output by input |
The second group of letters describes the waveform of the output voltage |
The third block of digits describes the behaviour of the output in the event of load jumps and changes to the operating mode |
| Only for normal operation |
1st letter: Normal operation or bypass 2nd letter: battery operation |
1st digit: when changing the operating mode 2nd digit: for linear load jump (worst case) 3rd digit: for non-linear load jump (worst case) |
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Code meaning |
Code meaning |
Code meaning |
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VFI (Voltage and Frequency Independent) UPS output independent of the mains; voltage and frequency changes within the limits of IEC 61000-2-2
VI ( Voltage Independent) UPS output dependent on the mains frequency; voltage stabilised (electrical/passive) within the limits for normal operation VFD (Voltage and Frequency Dependent) UPS output dependent on voltage and frequency changes in the mains. |
S: Waveform of the output voltage sinusoidal distortion shape D < 0.08 harmonic < IEC 61000-2-2 with linear and non-linear reference load
X: Waveform of the output voltage sinusoidal with non-linear load. With non-linear load, distortion factor D-0.08 for overload. Y: Non-sinusoidal voltage curve exceeds the limit values according to IEC 61000-2-2 |
1: uninterruptible
2: voltage interruption |
| The first three letters indicate the quality of supply of the consumer load during normal operation, which is expected for more than 90% of the operating time. The selection is determined by whether narrow further tolerances are permissible because the given load is insensitive to changes in frequency or voltage. |
The following two letters indicate the voltage waveform in normal operation (including occasional bypass operation) and in battery operation.
The connection of larger non-linear loads can cause a distortion of the voltage curve compared to that of a resistive or inductive load. If the waveform is sinusoidal for a linear load, the necessary restrictions for non-linear loads are specified by the manufacturer and indicated by an ‘X’. UPS devices that generate a non-sinusoidal voltage (e.g. rectangular or stepped) are labelled ‘Y’. This type of waveform is permissible for many loads temporarily or in continuous operation. |
The last three digits indicate the transient voltage behaviour of the UPS devices under different conditions and indicate the most unfavourable condition. These characteristics are determined with standardised loads. The actual behaviour for a given application should be clarified with the manufacturer. |
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UPS classification according to EN 50091-3 and EN 62040-3 |
Common designation | ERREPI products |
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VFI (Voltage and Frequency Independent)
(Input voltage and input frequency independent) |
On-line, double conversion Continuous operation Continuous converter double conversion |
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VI (Voltage Independent)
(input voltage independent) |
Line-interactive Delta conversion Single conversion Active tracking mode |
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VFD (Voltage and Frequency Dependent)
(Input voltage and input frequency dependent) |
Off-line Stand-by Passive tracking mode Standby mode |
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