• There is an electrical fault between the PV panels or wiring and protective earth or the input surge suppression circuitry on the SPG-360-2K0-1 has been damaged due to a lightning surge.
• Turn off the PV array main switch, the solar supply main switch and the AC isolation device (if present).
• Unplug the PV inputs from the inverter.
• Turn on the PV array main switch.
• Measure the following three voltages supplied by the PV array using a multimeter with a 10MΩ input resistance:
  • PV+ to PV-
  • PV+ to protective earth
  • PV- to protective earth
• Confirm that b+c is much less than a.
• If b+c is approximately equal to a, there is an electrical fault in the array. Carefully inspect all PV panels and array wiring for damaged insulation.
• Temporarily connect a 1kΩ 10W resistor between + and – on each inverter input.
• With the 1kΩ resistors in 8 connected, check the DC resistances between each PV Wait until the voltages across these resistors are all less than 1V.

• There has been excessive leakage current from the PV array to the earth while the inverter was generating power. This fault can occur sometimes during heavy rainfall or if there is heavy condensation on the PV arrays, due to increased leakage currents between the arrays and earth via this water. If this is the case, once the array has dried off, the fault should clear.
• If there has not been any water on the PV array, there is an electrical fault between the PV panels or wiring and protective earth or the input surge suppression circuit on the SPG-360-2K0-1 has been damaged due to a lightning surge. Perform the tests in "Isolation Fault" above.

• Wait for 5 minutes. If the grid returns to normal, the inverter will automatically restart.
• Measure the grid voltage and frequency and confirm that they are within the over/under voltage and over/under frequency limits for the inverter. The factory programmed limits are 264Vrms, 206Vrms, 50.75Hz and 49.25Hz respectively; however, the local utility may have required these to be changed at system commissioning

• The AC mains grid has been disconnected.
• Check that AC mains voltage is present at the main switchboard and the distribution board to which the SPG-360-2K0-1 is connected.
• Check that the solar supply main switch and AC isolation device (if present) are turned on.
• Check the connections to the inverter’s AC output cable.

• Check that the PV input voltage is less than 500Vdc.
• If less than 500Vdc and the fault persists, contact SEA service.

• Check that the inverter heat sink is clean and free from debris.
• Reduce the ambient temperature by improving ventilation around the inverter.
• If the fault persists, contact SEA service.

• Turn off the PV array main switch, the solar supply main switch and the AC isolation device (if present).
• Leave these switches off for at least one hour.
• Turn the PV array main switch, the solar supply main switch and the AC isolation device (if present) back on. The fault should reset.
• If the fault persists, contact SEA service.

• Check that the AC mains grid L (Active) and N (Neutral) leads have not been reversed.
• Turn off the PV array main switch, the solar supply main switch and the AC isolation device (if present).
• Leave these switches off for a few seconds.
• Turn the PV array main switch, the solar supply main switch and the AC isolation device (if present) back on. The fault should reset.
• If the fault persists, contact SEA service.

Consistent fault Relay failure DC INJ High EEPROM Failure SCI Failure Low DC Bus Ref 2.5V Fault DC Sensor Fault

• Turn off the PV array main switch, the solar supply main switch and the AC isolation device (if present).
• Leave these switches off for a few seconds.
• Turn the PV array main switch, the solar supply main switch and the AC isolation device (if present) back on. The fault should reset.
• Turn the PV array main switch, the solar supply main switch and the AC isolation device (if present) back on. The fault should reset.
• If the fault persists, contact SEA service.