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Фрагмент инструкции
b. Connect the four wires from the core processor to the appropriate terminals on the transmitter. See Table 3 and Figure 13 (standard core processor) or Figure 14 (enhanced core processor). No bare wires should remain exposed. Do not ground the shield or drain wire(s) at the transmitter. Table 3. Transmitter terminals for 4-wire cable Terminal Wire color(1) Function 13 Red VDC+ 14 Black VDC– 15 White RS-485A 16 Green RS-485B (1) Wire colors apply only to 4-wire cable supplied by Micro Motion. 12 13 Figure 13. 4-wire cable to Model 3700 – standard core processor Figure 14. 4-wire cable to Model 3700 – enhanced core processor Core processor terminals 4-wire cable Model 3700 terminals blue terminal block (see Figure 11) VDC+ (Red) VDC– (Black) RS-485B (Green) RS-485A (White) Maximum cable length: see Table 1 User-supplied or factory-supplied cable 16 RS-485B (Green) 15 RS-485A (White) 14 VDC– (Black) 13 VDC+ (Red) Core processor terminals 4-wire cable Model 3700 terminals blue terminal block (see Figure 11) VDC+ (Red) RS-485B (Green) RS-485A (White) Maximum cable length: see Table 1 User-supplied or factory-supplied cable 16 RS-485B (Green) 15 RS-485A (White) 14 VDC– (Black) 13 VDC+ (Red) VDC– (Black) Wiring instructions for remote core processor with remote transmitter There are two phases to this procedure: • Wiring the remote core processor to the transmitter • Wiring the sensor to the remote core processor To wire the remote core processor to the transmitter: 1. Use one of the following methods to shield the wiring: • If you are installing unshielded wiring in continuous metallic conduit that provides 360° termination shielding for the enclosed wiring, go to Step 6. • If you are installing a user-supplied cable gland with shielded cable or armored cable, terminate the shields in the cable gland. Terminate both the armored braid and the shield drain wires in the cable gland. Go to Step 6. • If you are installing a Micro Motion-supplied cable gland at the core processor housing: -If you are using shielded cable, prepare the cable and apply shielded heat shrink as described in Step 4. The shielded heat shrink provides a shield termination suitable for use in the gland when using cable whose shield consists of foil and not a braid. Go to Step 2. - If you are using armored cable, prepare the cable as described in Step 4, but do not apply heat shrink – omit Steps 4d, e, f, and g. Go to Step 2. 2. Identify the components shown in Figure 10. Remove the core processor lid. 3. Slide the gland nut and the clamping insert over the cable. 14 4 1/2 in (114 mm) 3/4 in (19 mm) 7/8 in (22 mm) 7/8 in (22 mm) Shielded heat shrink Gland body Gland nut Gland clamping insert 4. For connection at the core processor housing, prepare shielded cable as follows (for armored cable, omit steps d, e, f, g): a. Strip 4 1/2 inches (114 mm) of cable jacket. b. Remove the clear wrap that is inside the cable jacket, and remove the filler material between the wires. c. Remove the foil shield that is around the insulated wires, leaving 3/4 inch (19 mm) of foil or braid and drain wires exposed, and separate the wires. d. Wrap the shield drain wire(s) around the exposed foil twice. Cut off the excess wire. Shield drain wire(s) wrapped twice around exposed shield foil e. Place the shielded heat shrink over the exposed shield drain wire(s). The tubing should completely cover the drain wires. f. Without burning the cable, apply heat (250 °F or 120 °C) to shrink the tubing. 15 Shielded heat shrink completely covers exposed drain wires g. Position gland clamping insert so the interior end is flush with the heat shrink. h. Fold the cloth shield or braid and drain wires over the clamping insert and approximately 1/8 inch (3 mm) past the O-ring. i. Install the gland body into the core processor housing conduit opening. 5. Insert the wires through the gland body and assemble the gland by tightening the gland nut. 6. Identify the wires in the 4-wire cable. The 4-wire cable supplied by Micro Motion consists of one pair of 18 AWG (0,75 mm2) wires (red and black), which should be used for the VDC connection, and one pair of 22 AWG (0,35 mm2) wire (green and white), which should be used for the RS-485 connection. Connect the four wires to the numbered slots on the core processor. 16 Power supply + (Red wire) Power supply – (Black wire) RS-485A (White wire) RS-485B (Green wire) Power supply + (Red wire) Power supply – (Black wire) RS-485A (White wire) RS-485B (Green wire) Core processor housing internal ground screw • For connections to earth ground (if core processor cannot be grounded via sensor piping and local codes require ground connections to be made internally) • Do not connect shield drain wires to this terminal 7. Reinstall and tighten the core processor lid. WARNING Twisting the core processor will damage the sensor. Do not twist the core processor. 8. To connect the cable to the transmitter, connect the four wires from the core processor to the a...
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