ABB ProcessMaster FEM630 Operating Instructions Manual

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ABB ProcessMaster FEM630 Operating Instructions Manual Manual pdf 32 page image

32FEM630 | ELECTROMAGNETIC FLOWMETER | OI/FEM630-EN REV. A6 Electrical connectionsSensor groundingMixed system, piping with cathodic corrosion potentialand functional ground potentialPower supplyNote• Adhere to the limit values of the power supply inaccordance with the information on the name plate.• Observe the voltage drop for large cable lengths andsmall conductor cross-sections. The voltage at theterminals of the device may not down-scale the minimumvalue required in accordance with the information on thename plate.The power supply is connected to terminal L (phase), N (zero),or 1+, 2−, and PE.A circuit breaker with a maximum rated current of 16 A mustbe installed in the power supply line.The wire cross-sectional area of the power supply cable andthe circuit breaker used must comply with VDE 0100 and mustbe dimensioned in accordance with the current consumptionof the flowmeter measuring system. The cables must complywith IEC 227 and/or IEC 245.The circuit breaker must be located near the device andmarked as being associated with the device.Connect the transmitter and sensor to functional earth.This mixed system has an insulated piping with corrosionprotection potential and an uninsulated metal pipe (L = ¼ ×DN sensor) with functional ground potential upstream anddownstream of the sensor.Figure 33 shows the preferred installation for cathodiccorrosion protection.G11048121A23BBBBConnection line corrosion potential*Insulated screw bolts without grounding platesInsulated pipingUninsulated metal pipingFunctional ground* ≥ 4 mm2 Cu, not included in the delivery, to be provided on-siteAB123Figure 33 Sensor with functional ground