RelayChk-FAIL / Relay-FAULT

Due to the working of the relay continuously the relay would have got struck due to which the fault occurs.

Extreme environmental conditions, such as high temperatures or excessive humidity, can impact the relay’s performance and lead to faults.
Electromagnetic interference or radiofrequency interference from nearby electronic equipment may affect the relay’s operation.
Loose or damaged wiring connections in the relay circuit can lead to faults.
Communication failures between the inverter and other components can cause relay faults. Ensure proper communication protocols and connections.
Fluctuations in voltage levels, either exceeding the upper limit (overvoltage) or falling below the lower limit (undervoltage), can trigger relay faults.
Excessive current or a short circuit in the system can lead to relay faults. Inspect the circuit for any signs of overcurrent or short circuits.
Malfunctions or errors within the inverter, especially related to the relay control, can cause relay faults.

1. Inverter Discharge

Discharge inverter for 30min.
If the inverter resumes normal operation when restarted, there is no further action required.

2. Wire Connection Inspection:

For a new installation, please verify the proper connectivity of the AC gland. Ensure that the AC cable is securely connected to the connector terminal, adhering to the indicated polarity mentioned on the AC gland.
Inspect all wire connections starting from the AC connectors to the AC distribution box, and check the connections on the meter side, LT panel, and Transformer side as well. Look for any loose or untightened connections and assess if the wire contact area is sufficient. Address any issues found during this examination.
If there is suspicion of a loose contact, carefully disconnect the cable from the connector, AC distribution box (ACDB), and the meter/grid source. Subsequently, reestablish a secure and proper connection for the cable. Ensure all connections are tightly secured to prevent any potential issues.
Check earthing cable size and connectivity should be proper.

3. Voltage Checks:

When dealing with a three-phase system, conduct voltage checks on the AC side for phase-to-phase, phase-to-neutral, and neutral-to-earth readings. Always measure the readings from the inverter AC gland end.
For a single-phase system, check AC side voltage for phase-to-neutral, phase-to-earth, and neutral-to-earth readings. Again, ensure measurements are taken from the inverter AC gland end.
Capture comprehensive readings from information menus such as DC1, DC2, DC3, DC4, followed by VA, VB, VC, or VGrid, and check the Status (Error) and Total energy.

4. PV String Voltage Checks:

Verify the Open Circuit Voltage (VOC) of each PV string by measuring the voltage from the connector end after disconnecting the string from the inverter. This step ensures an accurate assessment of the individual VOC for each PV string.
Utilize a multimeter to measure the voltages between PV+ and earth, as well as PV- and earth for all the PV strings. The voltages should exhibit a decreasing trend, falling within the range of 5% to 95% of the Voc (Open Circuit Voltage) of a single PV module. If the voltage remains constant at the Voc of a single module or increases during the decreasing conditions, it indicates a fault within the PV strings that needs to be addressed.

5. Replace inverter

If you confirm that the inverter relay is defective, please contact Autarco Support support@autarco.com for a replacement.

This is an inverter-driven issue.

Issue Creation

If the inverter sends a single message with this type of alarm in a 24hr period an issue will be created.

Resolution:

If a 24hr period passes with good production, and not futher alarms, the issue will be automatically resolved.