1. Introduction

The TRO ABNORMAL alarm typically occurs when there is an issue with the TRO Sensor Unit (TSU) or the TRO Sensor not receiving or experiencing a leakage of air. The TSU is installed in the Pump Room (P/R) and must always have a continuous air supply.

2. Troubleshooting Steps

Step 1: Check the Air Supply to TSU

• Ensure that the main air supply valve to the TSU in the Pump Room is OPEN.

Step 2: Verify Air Regulator Pressure

• Inside the TSU, two air regulators must supply air to maintain the required pressure.
  
• Confirm that both regulators are operating within this range.
• Take a photo of the pressure gauges for verification.

Step 3: Inspect the TRO Sensor Box for Air Leaks

• Locate the cable gland on the left side of the TRO Sensor Box.
  
• Tighten the cable gland to ensure no air leakage.

Step 4: Check the TRO Sensor Box Door Latch

• If the TRO Sensor Box Door latch is loose, it may cause air leaks.
• Use the key to unlock the door (turn counterclockwise).
• Tighten the door latch to ensure proper sealing.
  

Step 5: Operate the Air Sentinel System

• The Air Sentinel is installed on the right side of the TRO Sensor Box.
• Turn the Air Sentinel key clockwise to switch to BYPASS mode.
• Check if the MAIN BOARD display inside the TRO Sensor Box turns on.
• Take a photo of the TRO MAIN BOARD display for verification.
  

Step 6: Verify Air Intake Sound

• With the TRO Sensor Box Door open, check the AIR INTAKE SOL at the bottom right of the TRO Sensor.
• If air is being supplied correctly, you should hear a “shhh” sound.
  

Step 7: Restore Normal Operation

• Close the TRO Sensor Box Door by turning the key clockwise.
• Turn the Air Sentinel key counterclockwise to switch back to ONLINE mode.
• Confirm that the Air Sentinel LEDs for “PRESSURE, TIMER, BYPASS” all turn green.
• Take a photo of the Air Sentinel LED indicators for verification.
  

Step 8: Reset Alarm on Remote Control Panel (RCP)

• On the RCP HMI screen (installed in the CCR), press and hold the RESET button for 2 seconds.
• Check if the TRO ABNORMAL alarm changes from red to green.
• If the alarm resets successfully, the BWTS system can be operated normally.
  

3. Conclusion

By following these troubleshooting steps, you can systematically diagnose and resolve the TRO ABNORMAL alarm issue. Ensure all verification steps are completed, including checking pressure levels, confirming air supply, securing connections, and resetting the alarm.