Flowserve Limitorque MX DeviceNet Field Unit User Manual

Page 14

Limitorque MX DeviceNet Field Unit FCD LMENIM2328-00 – 11/05

NOTE: Recommended DeviceNet cable is Belden 3084A or equal. 121 ohm, ¼ W +/-1% termination
resistors must be connected at each segment end. Customer is required to connect wire between
terminal 30 and chassis ground for surge protection. Preferred network wiring is to connect shield to
terminal 48 for only one unit on each segment. Connect remaining individual network cable shields
together to ensure proper shielding of entire network. Consult wiring diagram for exact terminal connec-
tion points as they may change.

Prepare the network cable for connection to the MX terminal block as follows.

CAUTION:

Strip stranded conductors carefully; do not damage the strands. This will weaken the

conductor. Do not nick conductors or conductor insulation when stripping away the insulation.
Nicking stresses the conductor and can cause the conductor to break. This type of damage may
not be apparent and failure can occur later without warning.

NOTE: Excess cable should be cut, not coiled or looped, to prevent noise induction into the network and
to reduce signal loss through unnecessarily long cable runs.

Cable Preparation
1. Remove two to three inches (5 to 8 cm) of the outer plastic jacket.

2. Separate the cable parts. Unbraid the shield and peel back the foil shield to the same point where

the outer jacket was removed. Cut away the braided shield and the foil shield. Strip the insulation
from the conductors approximately 0.4 inch (1 cm).

3. Apply heat shrink tubing to insulate the drain wire and to provide stress relief to the cable.

CAUTION:

Do not melt the insulation. NOTE: Ungrounded drain wires should be cut even with

the cable sheath. The brand foil and drain wire should have heat shrink tubing applied.

4. Install ring tongue connectors. Flowserve recommends the use of Thomas & Betts #RZ22-6 for

optimum results.

5. Connect the network cables to the MX terminal block as shown in Wiring Diagram #18-499-0181-3.

Table 3.1

Shield

(Blue) DATA (-)

(White) DATA (+)

(Black) Network 0 V

(Red) Network 24V

EGND

Earth ground for surge protection circuit

NOTE: Ground each segment of the cabling at only one point to prevent ground loops, which can affect system

performance. Verify the actuator is properly grounded.

6. Install jumper cable from terminal block pin 30 to earth ground or ground lug.