Varec 4000 manual ATT Mark/Space Wiring, Typical Mark/Space Field Wiring

4000 Installation

2.4.6ATT Mark/Space Wiring

For an ATT using the Mark/Space field communications option, the following additional wiring connections must be made. (Refer to Input Power Wiring in Section 6 to determine the minimum wire size required.). See Figure 2-6.

•Run two twisted pairs of 18 AWG wire (Mark/Space wires) into the ATT through the conduit entry along with the 48 VDC power wiring.

•Connect the Mark line to terminal 11, M/485-, and the Space line to terminal 12, S/485+, on the terminal block assembly.

8203 With 8210 expansion module

Field Junction Box

4 Conductor

Cable

18 AWG

Shielded

To Other

4-Wire

Transmitters

in Area 0

Ground shield at RTU8130 ONLY!

Do NOT ground shield at transmitter.

External

Power Supply

Varec

Model 4000

ATT

Details of RTU8130 with 8210 expansion module and ATT termination board wiring

Figure 2-6: Typical Mark/Space Field Wiring

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