Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
26
Cable Preparation
Prepare the network cable for connection to the QX actuator terminal block as follows in Figure 3.8 through 3.11. Table
3.6 details connections for Foundation Fieldbus.
Table 3.6 – Foundation Fieldbus connections
Terminal Block Number FF Function
4 DATA (-)
5 DATA (+)
The shield must be connected to ground or earth at only one place. The cable shield is generally grounded at the power
conditioner.
Reference the Fieldbus Foundation Application Guide 31.25 kbit/s Wiring and Installation guide for more information on
network wiring.
a
CAUTION: Strip stranded conductors carefully; do not damage the strands. This will weaken the conductor.
Do not nick conductors when stripping away the insulation. Nicking stresses the conductor and can cause the
conductor to break. This type of damage may not be apparent and failure can occur later without warning.
3.3.9 Network Wiring – Profibus DP/PA Installation
Profibus DP is based on RS 485 communication. The standard EN 50170 specifies the cable for use with Profibus DP.
The following specifications need to be fulfilled by the Profibus cable:
Table 3.7 – Profibus cable specifications
Parameter Type – Profibus DP
Impedance 135 to 165 ohm/3 to 20 MHz
Capacity < 30 pF/m
Resistance < 110 ohm/km
Wire gauge > 0.64 mm
Conductor area > 0.34 mm
2
The Profibus DP cable is a shielded twisted pair cable.
In general, there are two different types of cables available. The most commonly used cable has solid wire for the
Profibus line. When there is a need for more flexiblity (bending) and higher environmental resistance, a cable with
stranded wire for the Profibus line and special jackets shall be used. Limitorque recommends the use of:
• Belden 3079A Specifications, 22 AWG, shielded, solid two conductor
Key Specifications
• Capacitance/ft = 8.5 pF
• Nominal Impedance (ohms) – 150.0
Network Wiring - Profibus PA
Please refer to IEC 61158 & ANSI/ISA S.50.02 Part 2-1992 for network wiring guidelines. Refer to Table 3.7 for
connections.
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