RFT9709 Transmitter Instruction Manual
35
Troubleshooting
continued
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4.4
Power supply
Check to be certain the power-supply is 11-30 VDC. Ensure all wires are
properly terminated. The RFT9709 power-supply and ground terminals
are labeled as illustrated in Figure 4-3.
Figure 4-3.
Power-supply wiring and
grounding terminals
4.5
Wiring
For transmitter wiring instructions, refer to
Installation Step 2
, page 7.
Wiring problems are often incorrectly diagnosed as a faulty sensor. At
initial startup of the RFT9709, always check the following:
1. Proper sensor cable, and use of shielded pairs
a. Proper wire termination
b. Wires on correct terminals
c. Wires making good connections at RFT9709 terminals
d. Wires making good connections at the sensor terminals
2. Wires properly connected at any intermediate terminal junction, such
as the user-supplied junction box between a Model DT sensor and
RFT9709.
If a fault condition is indicated, follow these instructions:
1. Shut off power supply to the RFT9709.
2. Unscrew the two screws that hold the terminal blocks to the
RFT9709, and unplug the terminal blocks from the connectors.
3. Use a digital multimeter (DMM) to measure resistance between wire
pairs at the RFT9709 terminals:
• Drive coil, check terminals 1 and 2
• Left pickoff coil, check terminals 5 and 9
• Right pickoff coil, check terminals 6 and 8
• RTD, check RFT9709 terminals 3 and 7
4. If the measured resistance is outside the range listed in Table 4-2,
page 36, repeat the measurements at the sensor terminals.
5. Reinsert the terminal blocks and restore power to the RFT9709.
6. Use the DMM and the guidelines listed in Table 4-3, page 36, to
troubleshoot the flowmeter.
23 24 25
11–30 VDC power supply
Terminal
Function
23
DC–
24
DC+
25
09shoot.fm Page 35 Tuesday, March 2, 1999 9:26 AM
Summary of Contents for Fisher-Rosemount RFT9709
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