ABB SPFEC12 power processor module

ABB SPFEC12 power processor module

Technical data of product parameters

The maximum length of SPFEC12 cable per HART network is dependent on the
characteristics of the devices connected to the network and the characteristics of the
cable to be used.
In a HART network, long cable lengths are possible when the dominant low
impedance device (the HART Analog Input module) has an input impedance of
approximately 250 ohms. Low capacitance good-quality cable is used, and the
Smart transmitter (high impedance device) has a low input capacitance (less than
5000 pF) and a high input resistance (grater than 100 K ohm).
Example: Cable Length Calculation
Single Smart Transmitter, parallel network resistance = 250 ohm
(HART Analog Input module input impedance)
Smart Transmitter Capacitance: 5000 pF
Cable Capacitance (Cx): 50 pF/ft.
Cable Resistance (Rx): 0.016 ohm/ft. (22 AWG)
Cx – Cable capacitance per unit length (feet or meters): The capacitance from one SPFEC12
conductor to all other conductors (including the shield if shielded). This value is SPFEC12
usually available from the cable manufacturer.
Rx – Cable resistance per unit length (feet or meters): This value should be available
from the cable manufacturer. Table 13-5 contains the resistance values of some
common copper wire sizes. The resistance per unit length is for a single wire but the
length calculations and charts take into account the resistance of both wires.From Figure 13-6, using cable capacitance (Cx) of 50 pF/unit length and resistance SPFEC12
(Rx) of 0.016 ohm/unit length, a direct reading of the corresponding length on the
y-axis is approximately 3600 feet (unit length of feet from above parameters).

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