Proline Promag L 400 PROFIBUS DP Electrical connection
Endress+Hauser 33
7 Electrical connection
The measuring device does not have an internal circuit breaker. For this reason,
assign the measuring device a switch or power-circuit breaker so that the power
supply line can be easily disconnected from the mains.
7.1 Connection conditions
7.1.1 Required tools
• Torque wrench
• For cable entries: Use corresponding tools
• For housing cover: Torx screwdriver or flat-blade screwdriver
• Wire stripper
• When using stranded cables: crimping tool for ferrule
7.1.2 Requirements for connecting cable
The connecting cables provided by the customer must fulfill the following requirements.
Electrical safety
In accordance with applicable federal/national regulations.
Permitted temperature range
• –40 °C (–40 °F) to +80 °C (+176 °F)
• Minimum requirement: cable temperature range ≥ ambient temperature +20 K
Power supply cable
Standard installation cable is sufficient.
Signal cable
PROFIBUS DP
The IEC 61158 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
2
(22 AWG)
Cable type Twisted pairs
Loop resistance ≤110 Ω/km
Signal damping Max. 9 dB over the entire length of the cable cross-section
Shielding Copper braided shielding or braided shielding with foil shield. When grounding
the cable shield, observe the grounding concept of the plant.
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