Configuration and Use Manual
MMI-20019053
Troubleshooting
October 2022
2. Observe and record data for both the left pickoff and the right pickoff, over an appropriate period of time, under a variety of process conditions.
12.27 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 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.
WARNING
If the transmitter is in a hazardous area, wait five minutes after disconnecting the power. Failure to do so could result in an explosion causing death or injury.
Before inspecting the power supply wiring, disconnect the power source.
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. Inspect the voltage label inside the wiring compartment.
The voltage supplied to the transmitter should match the voltage specified on the label.
7.
WARNING
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.
Reapply power to the transmitter.
8. Test the voltage at the terminals.
If there is no power, contact customer service.
12.28 Check for radio frequency interference (RFI)
The transmitter Frequency Output or Discrete Output can be affected by radio frequency interference (RFI).
Possible sources of RFI include a source of radio emissions, or a large transformer, pump, or motor that can generate a strong electromagnetic field. Several methods to reduce RFI are available. Use one or more of the following suggestions, as appropriate to your installation.
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