2. Troubleshooting

Question 1

2.1 - Describe a time you identified and resolved a technical issue during commissioning.

Answer 1

• Turbine had an issue with Pitch Axis 2 and wasn’t pitching from 90 degrees.
• Tried to pitch manually through use of the Pitch HMI and the electro-brake would release but would still not pitch.
• Using the electrical schematics, tested for voltage through the circuit and found voltage into the inverter input but not on the output side. Resulting in the replacement of the inverter and leading to parameter upload through COMBIVIS.
• With use of the Pitch HMI recorded the blade position angle.
• Connected the laptop to the Inverter drive and change the IP address of the laptop to match the IP of the drive.
• Open COMBIVIS and scan for the drive.
• Locate and import the parameter list from a file located on the laptop and upload to the drive.
• On completion, rebooted the drive and checked the status of the drive to ensure upload was carried out correctly. Visually checked the correct LED’s were present… LED 3 PLC RUN and LED 4 INVERTER STATUS both to be green.
• Back on the Pitch HMI and in the blade position reference tab, entered the blade angle that was recorded previously.

three phase supply to lift, one phase reading 50V others reading 230V

Question 2

2.2 - How do you approach diagnosing problems with equipment or systems?

Answer 2

• Gather Information: Collect information regarding the issue. What is happening? Error messages? Unusual sounds?
  Consult documentation, reviewing manuals, schematics and previous maintenance records.
• Conduct Preliminary Checks: Visually inspect, looking for obvious signs such as loose connections, leaks or damaged components.
  Check equipment power supply and that it is receiving the correct voltage.
• Isolate Problem: Systematically test using a methodical approach, testing individual components of sections of the system. Diagnostic tools and software can also be used.
  Based on the symptoms look at the most likely causes and eliminate one by one.
• Diagnostic Tools: Use of voltage testing devices, multimeters, pressure gauges etc. to test electrical values and pressure.
  If possible use software diagnostics to test or retrieve error codes.
• Analysis and Hypothesis: Identify patterns in the data and look for trends to help formulate an explanation for the issue.
• Implement Solution: Make repairs or replace the suspected device/equipment. Then recalibrate or adjust settings if need be.
  Finally test the system to ensure the problem has been resolved.