What does License Expired mean on my Huawei SUN2000-60KTL-M0 Inverter?
If your Huawei Inverter shows 'License Expired', your privilege certificate has either entered the grace period or is about to become invalid. You need to apply for a new certificate and load it into the system.
Why does my Huawei Inverter show a Grid Overvoltage error?
A 'Grid Overvoltage' error on your Huawei Inverter indicates that the grid voltage is too high. First, check if the grid connection voltage exceeds the upper threshold. If it does, contact your local power operator. If you have confirmation from the power operator and their consent, you may need to modify the overvoltage protection threshold. Also, ensure the peak grid voltage does not exceed the upper threshold.
What causes a Grid Undervoltage error on a Huawei Inverter?
A 'Grid Undervoltage' error on your Huawei Inverter means the grid voltage is too low. If the alarm is temporary, it might be due to a temporary grid issue, and the SUN2000 should recover automatically. If it happens frequently, check if the grid voltage is within the acceptable range; if not, contact your local power operator. If the voltage is within range, you might need to adjust the undervoltage protection threshold with the power operator's approval. Also, check the AC circuit breaker and AC output power cable if the issue persists.
How to fix a High String Input Voltage error on a Huawei Inverter?
If your Huawei Inverter is showing a 'High String Input Voltage' error, it means the PV array is configured incorrectly. Too many PV modules are connected in series, causing the PV string's open-circuit voltage to exceed the SUN2000's maximum operating voltage. Reduce the number of PV modules connected in series until the PV string's open-circuit voltage is within the acceptable range. The alarm should then stop.
What does Low Insulation Resistance mean on my Huawei Inverter?
If your Huawei Inverter shows a 'Low Insulation Resistance' error, it could be due to a short circuit between the PV string and the PE cable, or the PV string may have been exposed to moisture, reducing the cable's insulation. Check the impedance between the PV string and the PE cable for any short circuits and correct them. Also, ensure the PE cable is correctly connected. If the impedance is lower than expected in a cloudy or rainy environment, you can try resetting the insulation resistance protection.
What does Device Fault mean on my Huawei SUN2000-60KTL-M0?
If your Huawei Inverter displays a 'Device Fault' error, it indicates an unrecoverable fault within the SUN2000. Turn off the AC output switch and DC input switch, wait 15 minutes, and then turn them back on. If the fault persists, contact Huawei technical support.
What does Built-in PID Operation Abnormal mean on my Huawei Inverter?
If your Huawei Inverter displays a 'Built-in PID Operation Abnormal' error, it could be due to low output resistance of PV arrays to ground or low system insulation resistance. 1. Turn off the AC output switch and then the DC input switch. After 15 minutes, turn on the AC output switch and then the DC input switch. 2. Check the output resistance of PV arrays to ground. If there is a short circuit or lack of insulation, rectify it. If the fault persists, contact your supplier/Huawei technical support.
What to do if my Huawei SUN2000-60KTL-M0 displays Faulty Monitoring Unit?
If your Huawei Inverter is showing a 'Faulty Monitoring Unit' error, it could be due to insufficient flash memory or bad sectors in the flash memory. Turn off the AC output switch and DC input switch, wait 15 minutes, and then turn them back on. If the problem continues, replace the monitoring board or contact Huawei technical support.
How to troubleshoot Grid Voltage Imbalance on a Huawei SUN2000-60KTL-M0?
If your Huawei Inverter is showing a 'Grid Voltage Imbalance' error, it means the difference between grid phase voltages is too high. First, check that the grid voltage is within the normal range. Then, check the connection of the AC output power cable. If the connection is correct but the alarm persists and affects power production, contact your local power operator.
Why does my Huawei Inverter show Grid Overfrequency?
If the Huawei Inverter displays 'Grid Overfrequency', it means the grid frequency is higher than the local power grid standard. If it's a one-time occurrence, it might be a temporary grid issue, and the SUN2000 should recover automatically. If it happens often, check if the grid frequency is within the acceptable range. If not, contact your local power operator. If it is within range, you may need to adjust the overfrequency protection threshold with their consent.
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