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Text version of the page
| MMMA | ||||||||||||||||
| Electrical connection | ||||||||||||||||
| 4 Electrical connection | ||||||||||||||||
| 4.1 General requirements The power supply range can differ depending on the instrument version. The exact range is stated in the Technical data. Take note of country-specific installation standards (e.g. the VDE regulations in Germany) as well as prevailing safety regulations and accident prevention rules. —i In hazardous areas you should take note of the appropriate regulations, conformity X/ and type approval certificates of the sensors and power supply units. | ||||||||||||||||
| 4.2 Power supply General Power supply and current signal are carried over the same two-wire connection cable. The requirements on the power supply are stated in the Technical data of this Product Information manual. | ||||||||||||||||
| 4 ... 20 mA/HART two-wire The VEGA power supply units VEGATRENN 149AEx, VEGASTAB 690, VEGADIS 371 as well as the VEGAMET signal conditioning instruments are suitable for power supply. When one of these instruments is used, a reliable separation of the supply circuit from the mains circuits acc. to DIN VDE 0106 part 101 is ensured for VEGA-PULS. | ||||||||||||||||
| 4 ... 20 mA/HART four-wire Power supply and current output are carried on two separate connection cables. The standard version can be operated with an earth-connected current output, the Exd version must be operated with a floating output. The instrument is designed in protection class I. To maintain this protection class, it is absolutely necessary that the ground conductor be connected to the internal ground conductor terminal. | ||||||||||||||||
| Profibus PA The power supply is provided via a Profibus DP/PA segment coupler or a VEGALOG 571 EP input card. Foundation Fieldbus Power supply via the H1 Fieldbus cable. | ||||||||||||||||
| 4.3 Connection cable The sensors are connected with standard cable without screen. An outer cable diameter of 5 ... 9 mm ensures the seal effect of the cable entry. I f electromagnetic interference is expected, screened cable should be used for the signal lines. Profibus PA, Foundation The installation must be carried out acc. to the appropriate bus specification. VEGA- Fieldbus PULS is connected respectively with screened cable acc. to the bus specification. Power supply and digital bus signal are transmitted via the same two-wire connection cable. Make sure that the bus is terminated via appropriate terminating resistors. | ||||||||||||||||
| In Ex applications, the corresponding installation regulations must be noted for the connection cable. | ||||||||||||||||
| Radar - Level measurement | ||||||||||||||||
| 19 | ||||||||||||||||