Flowserve DDC-100 Master Station II - Manual (Page 17)

FCD LMAIM5001-00 DDC-100 Master Station II Installation and Operation Manual 17
Flow Control Division
Limitorque Actuation Systems
Table 4-1: Network Channel B Connection
Connector MX-DDC UEC-3-DDC
Data 41 TB4 D-S
Data * 29 TB4 D-S*
Shield
6. Electrostatic Ground. A good quality earth ground MUST be attached to the Master Station. An
effective local, low-impedance earth ground (less than 5 ohms) is required.
Table 4-2: Network Channel A Connection
Connector MX-DDC UEC-3-DDC
Data 16 TB3 D-M
Data * 15 TB3 D-M*
Shield
7. Hot Standby unit main power switch and connector for 120 – 240 VAC. DO NOT use when 24 VDC
power is applied.
8. Hot Standby auxiliary 24 VDC power connection. Master Station may be configured for 24 VDC
power. This will require the jumpers inside the Master Station to be configured for 24 VDC. DO NOT
use 120 VAC when using 24 VDC power.
9. Hot Standby DCS Port. DB-9 Female connector. Port may be RS-232 or RS-422 or RS-485. Each
electrical standard uses a different wiring convention.
10. Hot Standby Printer / Debug Port. DB-9 Female connector. RS-232 port. Used for Master Station
diagnostics.
4.2 Master Station Wiring Requirements
The network cable connects the field units to the host controller or Master Station. Belden 3074F, 3105A,
or 9841 shielded, twisted-pair cable should be used. The use of other cables may result in a reduction of
internodal distances or increased error rate, and is the user’s responsibility.
Belden 3074F Specifications
• Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 5000' (1.52 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 5000' (1.52 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 = 18 AWG (7 x 26) 6.92 ohms each conductor (13.84 ohms for the pair)
• Capacitance/ft = 14 pF (conductor-to-conductor)
• Capacitance/ft = 14 pF (conductor-to-shield)