
Configuration and Use Manual
145
Troubleshooting
Meas
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Defaults
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Compensa
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11.14.1
Checking the power supply wiring
To check the power supply wiring:
1. Verify that the correct external fuse is used. An incorrect fuse can limit current to the
transmitter and keep it from initializing.
2. Power down the transmitter.
3. If the transmitter is in a hazardous area, wait five minutes.
4. Ensure that the power supply wires are connected to the correct terminals. Refer to
Appendix B for diagrams.
5. Verify that the power supply wires are making good contact, and are not clamped to the wire
insulation.
6. 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.
11.14.2
Checking grounding
The sensor / transmitter assembly must be grounded. See your sensor installation manual for
grounding requirements and instructions.
11.14.3
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 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.
WARNING
Removing the transmitter housing cover in explosive atmospheres while the
power is on can subject the transmitter to environmental conditions that can
cause an explosion.
Before removing the transmitter housing cover in explosive atmospheres, be sure
to shut off the power and wait five minutes.
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