Flowserve DDC-100 Master Station II - Manual (Page 18)

18 DDC-100 Master Station II Installation and Operation Manual FCD LMAIM5001-00
Flow Control Division
Limitorque Actuation Systems
Belden 3105A Specifications
• Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 4500' (1.37 km)
For loop mode, this is the total length between operating field units. If a field unit loses power, the relays
internal to the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of
the cable (assuming a single field unit fails). To ensure operation within specifications in the event of
power failure to field units, this consideration must be added. Example: To ensure operation within
specification when any two consecutive field units lose power, the maximum length of cable up to 19.2
bkps should not exceed 4500' (1.37 km) per every four field units. See Section 3.1.2.3, Network Cable
Connection to Host Controller or Master Station.
Key Specifications
• Resistance/1000 ft = 22 AWG (7 x 30) 14.7 ohms each conductor (29.4 ohms for the pair)
• Capacitance/ft = 11.0 pF (conductor-to-conductor)
• Capacitance/ft = 20.0 pF (conductor-to-shield)
Belden 9841 Specifications
• Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 3500' (1 km)
For loop mode, this is the total length between operating field units. If a field unit loses power, the relays
internal to the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of
the cable (assuming a single field unit fails). To ensure operation within specifications in the event of
power failure to field units, this consideration must be added. Example: To ensure operation within
specification when any two consecutive field units lose power, the maximum length of cable up to 19.2
bkps should not exceed 3500' (1 km) per every four field units. See Section 3.1.2.3, Network Cable
Connection to Host Controller or Master Station.
Key Specifications
• Resistance/1000 ft = 24 AWG (7 x 32) 24 ohms each conductor (48 ohms for the pair)
• Capacitance/ft = 12.8 pF (conductor-to-conductor)
• Capacitance/ft = 23 pF (conductor-to-shield)