Mixed System, Piping With Cathodic Corrosion Potential And Functional Ground Potential; Power Supply - ABB ProcessMaster FEM630 Operating Instructions Manual

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F EM63 0 | E L EC TR OM AG N E T I C FLOWM E T E R | O I/F E M6 3 0-EN RE V. A
6 . . .Electrical connections
. . .Sensor grounding
Mixed system, piping with cathodic corrosion potential
and functional ground potential
3
1 2
B
B
A
Connection line corrosion potential*
B
Insulated screw bolts without grounding plates
1
Insulated piping
2
Uninsulated metal piping
3
Functional ground
* ≥ 4 mm2 Cu, not included in the delivery, to be provided on-site
Figure 33 Sensor with functional ground
This mixed system has an insulated piping with corrosion
protection potential and an uninsulated metal pipe (L = ¼ ×
DN sensor) with functional ground potential upstream and
downstream of the sensor.
Figure 33 shows the preferred installation for cathodic
corrosion protection.
2 1
B
B
A

Power supply

Note
• Adhere to the limit values of the power supply in
accordance with the information on the name plate.
• Observe the voltage drop for large cable lengths and
small conductor cross-sections. The voltage at the
terminals of the device may not down-scale the minimum
value required in accordance with the information on the
name 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 must
be installed in the power supply line.
The wire cross-sectional area of the power supply cable and
G11048
the circuit breaker used must comply with VDE 0100 and must
be dimensioned in accordance with the current consumption
of the flowmeter measuring system. The cables must comply
with IEC 227 and/or IEC 245.
The circuit breaker must be located near the device and
marked as being associated with the device.
Connect the transmitter and sensor to functional earth.