Electrical Connection; Electrical Safety; Connecting Requirements; Required Tools - Endress+Hauser Proline Prosonic Flow I 400 Operating Instructions Manual

Electrical connection

34
7 Electrical connection
WARNING
L
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. 16 A in
the plant installation.
7.1

Electrical safety

In accordance with applicable national regulations.
7.2

Connecting requirements

7.2.1

Required tools

• Torque wrench
• For cable entries: Use corresponding tools
• Wire stripper
• When using stranded cables: Crimper for wire end ferrule
7.2.2

Requirements for connecting cable

The connecting cables provided by the customer must fulfill the following requirements.
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
Modbus RS485
The EIA/TIA-485 standard specifies two types of cable (A and B) for the bus line which
can be used for every transmission rate. Cable type A is recommended.
Cable type A
Characteristic impedance 135 to 165 Ω at a measuring frequency of 3 to 20 MHz
Cable capacitance < 30 pF/m
Wire cross-section
> 0.34 mm
Cable type Twisted pairs
Loop resistance ≤110 Ω/km
Signal damping Max. 9 dB over the entire length of the cable cross-section
Shield Copper braided shielding or braided shielding with foil shield. When grounding
the cable shield, observe the grounding concept of the plant.
Proline Prosonic Flow I 400 Modbus RS485
2 (22 AWG)
Endress+Hauser