Troubleshooting
Event code | Causes | Recommended measures |
---|---|---|
Grid overvoltage | The grid voltage exceeds its permissible range or the grid is not available. | If the alarm occurs occasionally, there may be a fault in the power supply system. No additional measures are required. If the alarm occurs repeatedly, contact your local power company. If the fault is not due to the grid, check the grid settings of the inverter using the KOSTAL PIKO CI Conf Tool app. If the alarm persists for a long time, check whether the AC line circuit breaker / AC terminals are disconnected or the grid power supply has failed. |
Grid undervoltage | ||
Grid missing | ||
Grid overfrequency | ||
Grid underfrequency | ||
Grid error | ||
PV overvoltage | The input voltage of the PV modules exceeds the permissible range of the inverter. | Check the number of PV modules and adjust them if necessary. |
PV undervoltage | The input voltage of PV modules is below the preset protection value of the inverter. | When the intensity of the sunlight is low, the voltage of the PV modules drops. No action is required. If the intensity of sunlight is high, check for short circuits, open circuits, etc. in the PV strings. |
PV insulation fault | There is a short circuit between PV strings and protective earth. PV strings are installed in a persistently humid environment. | If the alarm occurs accidentally, the external circuits (PV strings) will supply irregular values. The inverter automatically returns to normal operation after the fault has been corrected. If the alarm occurs repeatedly or lasts for a long time, check whether the insulation resistance of the PV strings to earth is too low. |
Leakage current error | The insulation resistance to earth on the input side decreases during inverter operation, resulting in too high a residual current. | Check the insulation resistance to earth for the PV strings. If a short circuit has occurred, correct the error. If the insulation resistance to earth in a rainy environment is lower than the default value, adjust the insulation resistance in the KOSTAL PIKO CI Conf Tool app. |
Weak PV irradiation | PV strings have been covered for a long time. PV strings deteriorate. | Check whether the PV string is covered. If the PV string is clean and not covered, check if the PV modules are ageing or if the performance has deteriorated. |
PV string error | The cables of the PV strings were connected the wrong way round during inverter installation. | Check that the PV string cables are correctly connected. If they are connected the wrong way round, connect the cables correctly. |
BUS undervoltage | An unusual internal imbalance in relation to the energy control was caused by the PV strings, which triggered a major change in working conditions in the grid. | If the alarm occurs occasionally, the inverter can automatically return to normal operation after the fault has been corrected. If the alarm occurs repeatedly, contact your support team for technical assistance. |
BUS overvoltage | ||
Reverse polarity strings | ||
DC booster error | ||
EEPROM error | EEPROM component damaged | Please contact your support team. Replace the monitoring card. |
Zero power generation and yellow alarm light, which lights up in the remote monitoring system | Communication failure | If a data logger is being used, modern or otherwise, please restart the data logger. If the error still occurs, contact your support team. |
Remote monitoring system indicates zero power generation | Communication failure | If a data logger is being used, modern or otherwise, please restart the data logger. If the error still occurs, contact your support team. |
Remote monitoring system shows no output voltage | DC switch to OFF | Check if the DC switch is damaged, and if not, turn it to ON. If the error still occurs, contact your support team. |
Grid error | Fault in the power supply system | Wait until power is restored. |
DC switch to OFF | Turn the DC switch to ON. If the DC switch trips frequently, contact your support. | |
Master connection lost | Connection between slave and master inverter is interrupted. | Check whether the communication line to the master inverter has been interrupted. If the error still occurs, contact your support team. Check the communication settings in the KOSTAL PIKO CI Conf Tool app. |
Meter connection lost | Communication connection to energy meter (KSEM) interrupted | Check whether the communication line between the master inverter and energy meter (KSEM) has been interrupted. If the error still occurs, contact your support team. Check the communication settings in the KOSTAL PIKO CI Conf Tool app. |