Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
22
Table 3.4 – Required ratings for external wires
Up to Use wire rated at least
40°C to 55°C Ambient 60°C
56°C to 70°C Ambient
1
75°C
Note 1: Refer to unit nameplate.
3.3.7 Network Installations
The Limitorque QX offers a number of network options: DDC-Modbus, Foundation Fieldbus H1, Profibus DP_V1,
Profibus PA, and DeviceNet.
Ensure that the network cable type is Belden 3074F, Belden 3105, Belden 9841 or another cable that is within 5% of the
following specifications.
• Nominal impedance: 120 ohms @ 1 MHz
• Line to shield capacitance: 23.0 pF/ft (75.5 pF/m)
• Line to line capacitance: 12.8 pF/ft (42.0 pF/m)
Using other cables may result in decrease of internodal distance and/or an increase in communication error.
Particular care should be taken when terminating twisted-pair shielded cables in a control network. Avoid nicks, cuts, or
abrasions in the insulation of data communication cables, since this may result in inadvertent ground connection. Also,
excess cable should be cut, not coiled or looped, to prevent noise induction into the network.
Figure 3.6 – View of terminal block
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