Flowserve MX-100 Field Unit - Manual (Page 38)

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
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3.2 Installation Verification
3.2.1 Network Cabling Installation Verification
After installation is complete and prior to operation, inspect the network cable and its connection to each field unit for
the following:
NOTE: Units should be disconnected from power. Network should be disconnected from host.
1. There should be:
No nicks in the insulation—this can cause a short between conductors or to the grounded shield. •
No cut strands in a stranded conductor—this can cause a poor connection and eventually an open circuit. •
2. Verify that there is data wiring on each actuator per wiring diagram.
3. Cable armor should not be shorted to the cable shield/drain wire. Cable armor may not be at ground potential and
could be subject to lightning surges.
4. The shield/drain wire should only be grounded at one end of each cable segment (the section between adjacent
actuators or between the host system/Master Station II and an actuator) to avoid ground loop problems.
5. The ground/earth connection should be at true ground potential and effective at all times. See No. 5 in Section
3.1.1, Site Preparation.
For the redundant bi-directional loop, use a voltmeter in the control room. Determine the following by measuring
resistance of individual wires in the network cables:
NOTE: Power must be OFF on all field devices, and A1/A2 cables must be disconnected from the network host.
1. Data wire A1 to data wire A2 should be equal to the resistance value of network cable length/cable resistance per
1000 ft.
2. Data* wire A1 to data* wire A2 should be equal to the resistance value of network cable length/cable resistance per
1000 ft.
3. Confirm open circuit between data and data* cables.
4. Confirm open circuit between data, data*, and shield.
5. Confirm open circuit between shield and shield.
3.2.2 Field Unit Installation Verification
NOTE: Connect to either 24 VDC power or mains and activate power.
Verify the field unit is installed as follows:
1. Enter the “SETUP” mode as detailed in Bulletin LMENIM2306, MX Installation and Operation Manual.
2. In the “SETUP” mode, use the black control knob to select “YES” to the main menu selection “VIEW
DIAGNOSTICS?”
3. Select “YES” to the display “VIEW HARDWARE STATUS?”
4. Select “YES” to scroll through the menu selections. The LCD will read “DDC (OK) – NEXT?” if installed.
NOTE: If the “DDC (OK) – NEXT?” does not appear, contact Flowserve for assistance.
5. To return to the normal display, use the red knob to select either “LOCAL” or “REMOTE.”