Proline Promass E 500 PROFIBUS PA Electrical connection
Endress+Hauser 35
7 Electrical connection
L
WARNING
Live parts! Incorrect work performed on the electrical connections can result in an
electric shock.
‣
Set up a disconnecting device (switch or power-circuit breaker) to easily disconnect the
device from the supply voltage.
‣
In addition to the device fuse, include an overcurrent protection unit with max. 10 A in
the plant installation.
7.1 Electrical safety
In accordance with applicable national regulations.
7.2 Connecting requirements
7.2.1 Required tools
• For cable entries: use appropriate tool
• For securing clamp: Allen key 3 mm
• Wire stripper
• When using stranded cables: crimper for wire end ferrule
• For removing cables from terminal: flat blade screwdriver ≤ 3 mm (0.12 in)
7.2.2 Requirements for connection cable
The connecting cables provided by the customer must fulfill the following requirements.
Protective grounding cable for the outer ground terminal
Conductor cross-section < 2.1 mm
2
(14 AWG)
The use of a cable lug enables the connection of larger cross-sections.
The grounding impedance must be less than 2 Ω.
Permitted temperature range
• The installation guidelines that apply in the country of installation must be observed.
• The cables must be suitable for the minimum and maximum temperatures to be
expected.
Power supply cable (incl. conductor for the inner ground terminal)
Standard installation cable is sufficient.
Signal cable
For custody transfer, all signal lines must be shielded cables (tinned copper braiding,
optical coverage ≥ 85 %). The cable shield must be connected on both sides.
PROFIBUS PA
Shielded twisted-pair cable. Cable type A is recommended.
See https://www.profibus.com "PROFIBUS Installation Guidelines".
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