The error message "Check Grid CT / Installation Limit / Grid CT Lost" indicates a potential issue with the grid current transformer (CT) or the installation setup. This error can often be attributed to one of the following reasons:
More than One CT is Set to "Grid"
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- Problem: Only one CT (or set of three CTs in a three-phase system) should be set to the grid. Multiple grid CTs can confuse the system because there can only be one physical grid connection to the property.
- Symptom: If multiple CTs are set to the grid, one may read zero, which will be set as the grid reading even if another CT is reading correct values.
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- Solution: Check each device's configuration. The tilde symbol (~) indicates a device with a Grid CT configured. Ensure only one device has this configuration. To correct it, change the Grid setting to NONE in the menu of the incorrectly configured device
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The Grid CT Has Not Been Fitted or activated:
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- Problem: To track and measure power flow to/from the grid, a grid CT must be fitted. If missing, not connected, or not set up, myenergi devices cannot divert excess generation or display power in the app.
- Symptom: Lack of power tracking and measurement.
- Solution: Verify the presence and correct setup of the Grid CT by checking the device menus. The tilde symbol (~) should indicate a properly configured Grid CT. Install the CT if it is missing.
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The Grid CT is in the Wrong Place:
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- Problem: The CT must be installed to measure all power flowing into/out of the property. Incorrect placement can result in inaccurate readings.
- Symptom: Misreported power flow.
- Solution: Install the CT on the live cable coming from the electricity meter, ensuring it covers all power flow. In setups with a new consumer unit (fuse box) split via a "Henley Block," ensure the CT is correctly positioned.
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Faulty or Disconnected Grid CT:
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- Problem: The grid CT may be malfunctioning or physically disconnected, causing inaccurate readings or data loss.
- Symptom: Erratic or no data from the CT.
- Solution: Inspect and ensure the CT is functioning and securely connected.
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Improper Installation:
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- Problem: Incorrect wiring, placement, or loose fitting of the CT can cause failures in measurement.
- Symptom: Inaccurate or no readings.
- Solution: Verify and correct the installation according to the manufacturer's guidelines.
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Exceeding Installation Limits:
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- Problem: The current through the grid CT might exceed its rated capacity, causing errors or damage.
- Symptom: Overload errors.
- Solution: Ensure the current does not exceed the CT's rated limits and consider upgrading if necessary.
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Loose or Damaged Connections:
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- Problem: Loose, corroded, or damaged connections between the grid CT and monitoring/control equipment.
- Symptom: Disrupted signals.
- Solution: Check and secure all connections.
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Firmware or Software Issues:
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- Problem: Bugs or glitches in the system software can cause misreading or loss of CT data.
- Symptom: Inconsistent or erroneous data.
- Solution: Update firmware/software and reboot the system if needed.
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Electrical Interference:
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- Problem: Electrical noise or interference from other devices or wiring affecting CT performance.
- Symptom: Erroneous readings.
- Solution: Mitigate interference sources or shield the CT wiring.
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Environmental Factors:
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- Problem: Extreme temperatures, humidity, or other conditions impacting CT performance.
- Symptom: Performance degradation.
- Solution: Protect the CT from extreme conditions.
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Worn Out or Aged CT:
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- Verify Configuration: Check each device to ensure only one has the Grid CT configured (~ symbol present).
- Check Physical Installation: Confirm the CT is installed on the live cable from the electricity meter.
- Inspect for Missing CT: Ensure a Grid CT is physically present and properly connected.
- Update Software: Ensure the latest firmware/software is installed and configured correctly.
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Identifying and Resolving the Issue
- Verify Configuration: Check each device to ensure only one has the Grid CT configured (~ symbol present).
- Check Physical Installation: Confirm the CT is installed on the live cable from the electricity meter.
- Inspect for Missing CT: Ensure a Grid CT is physically present and properly connected.
- Update Software: Ensure the latest firmware/software is installed and configured correctly.
By systematically addressing each potential cause, you can resolve the "Check Grid CT / Installation Limit / Grid CT Lost" error and ensure accurate power measurement and management.