Emerson MICRO MOTION 1500, Configuration And Use Manual, Page: 155 / 282

Configuration and Use Manual 145
Troubleshooting
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5. Verify that the power supply wires are making good contact, and are not clamped to the wire
insulation.
6. (Model 1700/2700 transmitters only) Inspect the voltage label on the inside of the field-wiring
compartment. Verify that the voltage supplied to the transmitter matches the voltage specified
on the label.
7. Use a voltmeter to test the voltage at the transmitter’s power supply terminals. Verify that it is
within the specified limits. For DC power, you may need to size the cable. Refer to
Appendix B for diagrams, and see your transmitter installation manual for power supply
requirements.
12.14.2 Checking the sensor-to-transmitter wiring
To check the sensor-to-transmitter wiring, verify that:
• The transmitter is connected to the sensor according to the wiring information provided in
your transmitter installation manual. Refer to Appendix B for diagrams.
• The wires are making good contact with the terminals.
If the wires are incorrectly connected:
1. Power down the transmitter.
2. If the transmitter is in a hazardous area, wait five minutes.
3. Correct the wiring.
4. Restore power to the transmitter.
12.14.3 Checking grounding
The sensor and the transmitter must be grounded. If the core processor is installed as part of the
transmitter or the sensor, it is grounded automatically. If the core processor is installed separately, it
must be grounded separately. See your sensor and transmitter installation manuals for grounding
requirements and instructions.
12.14.4 Checking for RF interference
If you are experiencing RF (radio frequency) interference on your frequency output or discrete output,
use one of the following solutions:
• Eliminate the RF source. Possible causes include a source of radio communications, or a large
transformer, pump, motor, or anything else that can generate a strong electrical or
electromagnetic field, in the vicinity of the transmitter.
• Move the transmitter.
• Use shielded cable for the frequency output.
- Terminate output cable shielding at the input device. If this is not possible, terminate the
output shielding at the cable gland or conduit fitting.
- Do not terminate shield inside the wiring compartment.
- 360° termination of shielding is not necessary.