JUMO 406060, Руководство по эксплуатации

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5 Installation
26
Mixed system pipeline with cathodic corrosion
protection and functional earth potentials
A
Connecting line for corrosion
protection potential *
B
Insulated screw bolts without
grounding rings
1
Insulated pipe
2
Bare metal pipe
3
Functional earth
* ≥ 4 mm
2
Cu, not included in the delivery, to be provided onsite.
Figure 31: Flowmeter sensor with functional earth
This mixed system has an insulated pipeline with corrosion
protection potential and an uninsulated bar metal pipe
(L = ¼
x
flowmeter sensor size) with functional earth potential
upstream and downstream of the flowmeter sensor.
The Figure 31 shows the preferred installation for cathodic
corrosion protection systems.
5.5 Electrical connections
WARNING
Risk of injury due to live parts.
Improper work on the electrical connections can result in
electric shock.
• Connect the device only with the power supply switched
off.
• Observe the applicable standards and regulations for the
electrical connection.
The electrical connection may only be established by authorized
specialist personnel and in accordance with the connection
diagrams.
The electrical connection information in this manual must be
observed; otherwise, the IP rating may be adversely affected.
Ground the measurement system according to requirements.
5.5.1 Connecting the 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 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.