Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 125
9. If replacing the module does not fix the problem, replace the FTM. See instructions for replacing the
FTM in Chapter 15, Installation. The FTM does not contain any active components on the MPU
inputs, so replacing it should be the last option.
Prox Probes
If a prox probe input is not functioning properly, verify the following:
1. Check that the cable is shielded and the shield is properly grounded per the Shields and Grounding
section in Chapter 15, Installation.
2. Measure the input voltage on the terminal block. Low level of the input signal should be in the range
of 0-10V, high level should be in the range of 15 - 24V to ensure correct signal conditioning operation.
3. Verify that the signal waveform is clean and void of double zero crossings.
4. Verify that no ground connection exists and that the resulting 60 Hz signal is absent.
5. Measure the frequency. It should be in the range of 0.04 Hz to 25 kHz.
6. Check the wiring. Look for a loose connection at the terminal blocks, disconnected or misconnected
cables.
7. Check the software configuration to ensure that the input is configured properly.
8. If the readings are incorrect on several channels of the Speed module, replace the Speed module.
9. If replacing the module does not fix the problem, replace the FTM. See instructions for replacing the
FTM in Chapter 15, Installation.
Eddy Probes
If a eddy probe input is not functioning properly, verify the following:
1. Check that the cable is shielded and the shield is properly grounded per the Shields and Grounding
section in Chapter 15, Installation.
2. Measure the input voltage on the terminal block. It should be in the range of 7 - 24 V-peak.
3. Verify that the signal waveform is clean and void of double zero crossings.
4. Verify that no ground connection exists and that the resulting 60 Hz signal is absent.
5. Measure the frequency. It should be in the range of 1Hz to 25 kHz.
6. Check the wiring. Look for a loose connection at the terminal blocks, disconnected or misconnected
cables.
7. Check the software configuration to ensure that the input is configured properly.
8. If the readings are incorrect on several channels of the Speed module, replace the Speed module.
9. If replacing the module does not fix the problem, replace the FTM. See instructions for replacing the
FTM in Chapter 15, Installation.
Analog Inputs
If an analog input is not functioning properly, verify the following:
1. Check that the cable is shielded and the shield is properly grounded per the Shields and Grounding
section in Chapter 15, Installation (System Level Installation).
2. Measure the input voltage on the FTM terminal block. It should be in the range of 0-5 V.
3. Verify that there are no or minimal AC components to the Analog Input signal. Improper shielding may
introduce AC noise on the input terminals.
4. Check the wiring. If the inputs are reading 0 or the engineering units that correspond to 0 mA, look for
a loose connection on the terminal blocks, disconnected or misconnected cables, a missing jumper
on the terminal block if the input is a current input, or a blown fuse on the 24 Vdc on the FTM.
5. If all of the inputs are reading high, check that the 24 Vdc is not connected across the input directly.
6. Check the software configuration to ensure that the input is configured properly.
7. If the readings are incorrect on several channels of the 24/8 Analog module, corresponding to both
cables, replace the module.
8. If replacing the module does not fix the problem, replace the FTM. The FTM contains only traces and
a few discrete components, so failure is extremely unlikely. See instructions for replacing the FTM in
Chapter 15, Installation (System Level Installation).
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