Table of Contents

• 200350-10-00-01 Fault Diagnosis Entry
• Accelerometer Fault Symptoms
• Fault Diagnosis Logic (Field Thinking)
• Common Causes of Signal Fault
• Diagnostic Methods and Measurements
• Corrective Actions and Repair
• Real Troubleshooting Case
• Troubleshooting FAQ
• Final Technical Summary

200350-10-00-01 Fault Diagnosis Entry

Bently Nevada 200350-10-00-01 accelerometer faults are most often related to signal conditioning issues rather than hardware failure. Field data shows that more than 70% of abnormal readings originate from installation or wiring errors.

Accelerometer Fault Symptoms

• Constant high vibration values without mechanical issue
• Signal noise or unstable waveform
• Bias voltage outside 8–12 V range
• Intermittent signal loss

Fault Diagnosis Logic (Field Thinking)

Engineers typically follow a layered approach instead of replacing the sensor directly:

• Step 1: Check electrical signal (bias voltage)
• Step 2: Check wiring and shielding
• Step 3: Check mounting condition

  // Diagnostic Logic
  IF Bias_Voltage_Out_Of_Range THEN
      Check_Power_And_Current_Source();
  ELSE IF Signal_Noise THEN
      Inspect_Shielding_And_Ground();
  ELSE IF High_Value THEN
      Verify_Mounting_Rigidity();
  END_IF;
  

Common Causes of Signal Fault

• Ground loop due to dual grounding
• Insufficient excitation current
• Damaged cable or loose connector
• Improper mounting causing resonance
• EMI interference from VFD or motors

Diagnostic Methods and Measurements

• Measure bias voltage (should be ~10 VDC)
• Use oscilloscope to check waveform stability
• Perform tap test to confirm sensor response
• Swap input channel to isolate system issue

Corrective Actions and Repair

• Correct grounding (single-point only)
• Replace damaged cables
• Ensure proper current supply
• Reinstall sensor on rigid surface

Real Troubleshooting Case

In a blower monitoring system, abnormal vibration alarms were triggered:

• Reading: 8.8 mm/s
• Bias voltage: 5.2 V (abnormal)

Investigation showed insufficient current supply from the input module.

After adjustment:

• Current increased to 4 mA
• Bias voltage restored to 10.1 V

Result:

• Vibration returned to 3.0 mm/s
• System stable

Troubleshooting FAQ

What does low bias voltage indicate?

Usually insufficient current supply or wiring issue.

Can EMI cause vibration spikes?

Yes. High-frequency electrical noise can appear as vibration peaks.

Should I replace the accelerometer immediately?

No. Most issues are installation-related, not sensor failure.

Final Technical Summary

The Bently Nevada 200350-10-00-01 Troubleshooting Guide highlights that structured diagnosis—focusing on signal, wiring, and mounting—is essential. Correcting these factors resolves most field issues without replacing the sensor.