Check Power Supply Wiring - Emerson Micro Motion 5700 Configuration And Use Manual

Configuration and Use Manual
MMI-20029769
Table 17-5: Possible causes and recommended actions for low pickoff voltage
Possible cause
Sensor tubes are not vibrating
Moisture in the sensor electronics
The sensor is damaged, or sensor magnets may have
become demagnetized

17.26 Check power supply wiring

If the power supply wiring is damaged or improperly connected, the transmitter may not receive enough
power to operate properly.
Prerequisites
• You will need the installation manual for your transmitter.
• When using DC power, a minimum of 1.5 amps of startup current is required.
•
Procedure
1. Use a voltmeter to test the voltage at the transmitter's power supply terminals.
• If the voltage is within the specified range, you do not have a power supply problem.
• If the voltage is low, ensure that the power supply is adequate at the source, the power cable is
sized correctly, there is no damage to the power cable, and an appropriate fuse is installed.
• If there is no power, continue with this procedure.
2. Before inspecting the power supply wiring, disconnect the power source.
CAUTION
If the transmitter is in a hazardous area, wait five minutes after disconnecting the power.
3. Ensure that the terminals, wires, and wiring compartment are clean and dry.
4. Ensure that the power supply wires are connected to the correct terminals.
5. Ensure that the power supply wires are making good contact, and are not clamped to the wire
insulation.
6. Reapply power to the transmitter.
CAUTION
If the transmitter is in a hazardous area, do not reapply power to the transmitter with the housing
cover removed. Reapplying power to the transmitter while the housing cover is removed could
cause an explosion.
Configuration and Use Manual
Recommended actions
• Check for plugging or deposition.
• Ensure that the vibrating element is free to vibrate (no
mechanical binding).
• Verify wiring.
• Test coils at sensor. See
Eliminate the moisture in the sensor electronics.
Replace the sensor.
Troubleshooting
March 2019
(continued)
Check the sensor coils.
241