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PEB2025-N Datasheet(PDF) 8 Page - Siemens Semiconductor Group |
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PEB2025-N Datasheet(HTML) 8 Page - Siemens Semiconductor Group |
8 / 21 page Semiconductor Group 8 PEB 2025 During the first timestep ( t OFF1 ) since overload of the negative wire aFi was detected ( I aFi ≥ I max ), the current will be limited. Within the next timestep ( till t OFF3 ) the current must drop from 1.5 I max to I max, otherwise the line driver turns off. After t OFF3 any current above I max results turn off the line driver. After t OFF4, if no turn off of the line driver has occured, the current limiting characteristics becomes active again and will be prepared for detection of further overload conditions. Timestep t OFF1 is defined by charging the capacitor C T with the current I CLC which is specified in the AC characteristics. t OFF3 and t OFF4 depend on t OFF1: t OFF3 ≈ 15 t OFF1 t OFF4 = t AR ≈ 50 t OFF1 Note: If aFi has been switched off due to the time dependent current limiting circuit while C Ti is charged, an ON command has no effect. To turn on the line driver C Ti has to be discharged. C Ti will be discharged: – by an OFF command –if t OFF4 is reached – in non-automatic restart mode if the line driver has been switched off due to an overload condition. Figure 4 Diagram of the Transient Permitted Overload (TPO) State |
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