9.1.4 Troubleshooting of Faults in LCD Screen

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1 User Manual 9 and Maintenance Arc Detection Self-test An auto-test circuit is included in the module design of the inverter s AFDI function. If a DC arc fault is detected, the corresponding fault code will display on the LCD screen. Refer to of s in LCD Screen for display fault code and description to remove fault and manually start-up the inverter DC Arc If a DC arc fault is detected during normal operations, the inverter will disconnect from the AC grid. The DC arc fault is displayed on the inverter s LCD screen and the inverter is powered off. Please check the circuit and manually remove the fault by pressing ENTER of s in LCD Screen When faults occur, state will be shown on the main screen. Press to view multiple current fault information pages The grid voltage has exceeded inverter allowable upper limit. that the instantaneous sample value of the grid voltage exceeds the allowable limit for some 1. Check the voltage of the grid. 2. If the grid voltage exceeds the permissible range of inverter protective parameters, ask utility grid company for solution. 3. If the grid voltage is within the permissible range, contact 1. This is a short-term fault due to grid condition. Wait a moment for inverter recovery. 59

2 9 and Maintenance User Manual time Islanding The grid voltage has fallen below inverter s allowable lower limit. The grid voltage is too low. The AC output current exceeds inverter protective limit. AC overcurrent temporarily. The grid frequency has exceeded inverter allowable upper limit. The grid frequency has fallen below inverter allowable lower limit. The DC component of AC current has exceeded inverter limit. Inverter has detected that there is a failure current. that the grid is abnormal 1. Check the voltage of the grid. 2. If the grid voltage exceeds the permissible range of inverter protective parameters, ask utility grid company for solution. 3. If the grid voltage is within the permissible range, contact 1. This is a short-term fault due to grid condition. Wait a moment for inverter recovery. 1. The inverter will resume if the output current falls below the protective value. The inverter will self-recover after several seconds. 1. Check the frequency of the grid. 2. If the grid frequency exceeds the permissible range of inverter protective parameters, ask utility grid company for solution. 3. If the grid frequency is within the permissible range, contact Sungrow Service Dept.. 1. Check whether AC circuit breaker is triggered. 2. Check whether AC cables are all firmly connected. 3. Check whether AC fuses are blown out. 4. Check whether grid is not on service. 5. If all conditions are OK and this fault still occurs in the LCD screen, contact Sungrow Service Dept.. 1. Check the PV strings for ground fault. 1. Wait a moment for grid recovery. 2. If the grid parameters exceed the permissible range of inverter protective parameters, ask utility grid company for 60

3 User Manual 9 and Maintenance The average grid voltage over 10 minutes is not within the permissible range. Grid impedance has exceeded inverter s limit The AC output overloads. The inverter has checked that there is unbalance between the three phase voltages. The bus voltage is temporarily high The bus voltage is high that there is overcurrent of PV1 input. that there is overcurrent of PV2 input. PV configuration mode has changed during inverter running. the deviation of neutral point voltage. out the unbalance of neutral point voltage temporarily. There is high Bus fluctuation voltage. solution. 3. If the grid frequency is within the permissible range, contact Sungrow Service Dept.. 1. Check AC cables for appropriate size. 2. Wait a moment for inverter recovery. 3. If the fault occurs repeatedly, contact Check the layout and the wiring of PV1 input. Check the layout and the wiring of PV2 input. Check the PV input configuration mode and restart the inverter when necessary. 1. Inverter will recover if the deviation value falls below the protective limit. 1. Inverter will recover if the deviation value falls below the protective limit. 1. This is a short-term fault. Wait a moment for inverter recovery. 61

4 9 and Maintenance User Manual The DC current is not balanced between the two PV inputs for parallel PV configuration mode. the reverse polarity of PV connection. The temperature of module is too high The ambient temperature is too high The inverter has checked that there is a fault of relay. The insulation resistance is low. (ISO-flt) AC or DC overcurrent fault, or DC overvoltage fault. There is a fault with sampling channel Current imbalance The ambient temperature falls below -25 o C There is a fault with DC/AC inversion circuit There is a fault with PV1 boost circuit. There is a fault with PV2 boost circuit. The PV configuration mode set on the display is not in accordance with the configuration in 1. Disconnect inverter. 2. Reconnect PV strings. 1. Check whether AC output power exceeds norminal power too much. 2. Check whether fans work normally and whether there are some abnormal fans. Please replace broken fan, in necessary. 3. Clean air grills of outlet. 4. If the fault still exists, please contact with Sungrow. If the fault occurs repeatedly, contact Sungrow Service Dept.. Disconnect inverter to stop. Wait for ambient temperature to rise above -25 and then start inverter again. 1. Disconnect inverter. 2. Re-select PV configuration mode and re-connect PV strings. For more detailed information please refer to 6.4 Connecting 62

5 User Manual 9 and Maintenance the combiner unit. Phase-R current sampling channel fault. Phase-S current sampling channel fault. Phase-T current sampling channel fault. Hardware Overvoltage/ Overcurrent protection 0070 Fans are defective. Inverter to PV Arrays. Disconnect inverter and remove the broken fan with AC SPD It is necessary to replace the SPD module with DC SPD Contact 0073 Fuse has blown out Disconnect inverter and replace the fuses. Contact A fault has occurred in the internal 0074 Communication fault of communication of the inverter. However, the LCD inverter continues feeding into the grid. Contact 0075 Solar irradiation is not sufficient for inverter operation PV1 overload 0077 PV2 overload PV1 power abnormal warning PV2 power abnormal warning There is a fault with the AFD block Arcing warning 0089 AFD disable warning 1. Wait for higher irradiation. 2. If this recurs at medium irradiation, check the PV system design and correct the connection of PV inputs. Check the PV system design and correct the connection of PV1 inputs. Check the PV system design and correct the connection of PV2 inputs. 1. Check whether the PV1 input not connected or loose. 2. If all PV1 input cables are firmly attached and the warning fault still exists, please contact 1. Check whether the PV2 input not connected or loose. 2. If all PV2 input cables are firmly attached and the warning fault still exists, please contact Check the associated circuit and press ENTER to remove the fault. Remove the fault by reactivating the AFD function on the LCD screen. 63

6 9 and Maintenance User Manual Reverse polarity warning of PVS connection. The output current of the PVS is obviously abnormal. 1. Check the polarity of the PV inputs, if the polarity is reverse, please reconnect PV strings. with SUNGROW. 1. Check whether the PV array is shielded. If the PV array is clear and is not shielded, check whether the PV modules are faulty. 2. Check whether there is any DC input cable disconnected. If yes, refer to PVS Detect Settings to reset the inverter. 3. If the fault still exists, please contact with SUNGROW. 9.2 Maintenance Routine Maintenance Items Methods Period Save data Save the running data, parameters and log to a disk or a file. Once a month Refer to the manuals of the data logging devices. General Visual check any damage or deformation of the inverter. Check any abnormal noise during the running of state of the inverter. Every 6 months system Check each parameter of inverter operation. Check if the temperature of the housing is normal. Monitor the system using the thermal imager. System Check the temperature and dust of the inverter. Clean the inverter enclosure. Check the humidity and dust of the environment. Six months to a year (it depends clean Meanwhile check whether the filter function of on the dust the air inlet is ok. Clean the air inlet and outlet, contents in air.) when necessary. Electrical connection Check whether cable connections are loose. Tighten the loose connections. Check whether there is injury in the cables, especially the surface in contact with metal. Check whether the wrap belt of the connection terminals is strip-off. Six months after commissioning and then once or twice a year. 64