Network dataWhen dimensioning and selecting plant components, the supply systems data, supply system conditions and operating modes must be taken into account for these components. The most important data for a supply system include the rated voltage and rated frequency. These data for the supply system are designated as rated values in accordance with international agreements. Generally used rated voltages and rated frequencies In Europe the EN 60038 standard "CENELEC standard voltages" applies. This standard includes most of the international standard IEC 60038, 7. Edition, 2009, "IEC standard voltages". The IEC 60038 standard is the result of an international agreement to reduce the diverse rated voltage values that are in use for electrical supply networks and traction power supplies, load installations and equipment. As concerns the low-voltage range, note that in the EN 60038 the 220 V/380 V values (previously applicable in continental Europe) and 240 V/415 V values (previously applicable in the United Kingdom) for three-phase networks have been replaced by a single standardized value of 230 V/400 V. The supply frequency in Europe is 50 Hz. The tolerances for the rated voltages of the supply systems that were specified for the transition period up to 2003 were intended to ensure that equipment rated for the existing voltages could be operated safely until the end of its service life.
Conversion of low-voltage systems Supply voltages over 400 V (e.g. 500 V, 690 V) are occasionally used in Europe in large industrial plants. The IEC recommendation of 230 V/400 V has been implemented as national regulation in the most important countries, as far as the conditions in these countries allow. In North America, Central America and some northern South American countries the rated value for AC supply voltage is 120 V; but twice the supply voltage, i.e. 240 V, is common for larger loads. The low-voltage supply systems are normally implemented in these countries as single-phase three-conductor systems. Three-phase AC current is often unavailable to small consumers, if it exists at all, so the voltage is 208 V or 415 V. Three-phase networks are available for larger consumers at 480 V. The supply frequency is 60 Hz. In Asia, AC supply voltages of 100 V or 110 V (50 Hz or 60 Hz) are also common. Worldwide, numerous country-specific and regional characteristics prevail about which the local plant operators must be directly consulted. International supply voltages and frequencies in low-voltage systems
1) Industry only 2) No further expansion Connection and fusing on the line sideAll SITOP and LOGO!Power supplies are built-in devices. Compliance with the pertinent country-specific regulations is essential for installation and electrical connection of the devices. During installation, protective gear and isolating gear must be provided for activating the power supply. Power supply units cause a current inrush immediately after connection of the input voltage due to charging of the load capacitor, however, it falls back to the rated input current level after a few milliseconds. Aside from the internal impedances of the power supply, the inrush current is dependent on the size of the input voltage applied as well as the source impedance of the supply network and the line impedance of the supply line. The maximum inrush current for the power supplies is specified in the applicable technical data. It is important for dimensioning upstream protective devices. Single-phase SITOP and LOGO!Power supplies are equipped with internal device protection (fuses). For connection to the supply system, only one protective device (fuse or MCB) must be provided for line protection in accordance with the rated current of the installed cable. The circuit-breakers recommended in the data sheets and operating instructions have been selected such that even during the maximum current inrush that can occur under worst-case conditions on switching on the supply voltage, the circuit-breaker will not trip. A two-pole connected miniature circuit-breaker is required for the connection of certain device types. Three-phase SITOP power supplies do not have internal device protection. The up-circuit protective device (3-phase coupled miniature circuit breaker or motor protection switch) protects the cables and devices. The protective devices specified in the data sheets and operating instructions are optimized to the characteristics of the relevant power supplies. |
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