SOCOMEC

General Failures Analysis and Trouble Shooting Actions

Fault Message: RMCU Fault
Fault Definition: The ground current detected by the inverter is higher than the threshold after being connected to the AC grid.
Possible Causes: Obstacle, humidity, or water exists between AC LINE and/or NEUTRAL to earth ground; Insulation of AC wires is broken.
Proposed Actions for End-user: Disconnect DC/AC connection of the inverter, check DC/AC wires, clear obstacles safely, reconnect, and check the inverter status.
Proposed Actions for Professionals: Disconnect AC, check wiring and insulation, reconnect and check inverter status, update firmware or replace the inverter if necessary.

Fault Message: Isolation Fault
Fault Definition: The ground current detected by the inverter is higher than the threshold before being connected to the AC grid.
Possible Causes: Obstacle, humidity, or water exists between the DC side (PV panel) to earth ground; insulation of DC wires is broken.
Proposed Actions for End-user: Similar to RMCU Fault, including checking and clearing obstacles in a safe condition, and contacting local service if the problem persists.
Proposed Actions for Professionals: Similar to RMCU Fault, including checking both AC and DC wiring, updating firmware, or replacing the inverter if necessary.

Fault Message: Grid Fault (Grid Volt/Grid Freq)
Fault Definition: Grid measured data (voltage & frequency) is beyond the specification.
Possible Causes: AC voltage or frequency beyond/under the inverter setting, incorrect AC connection, weak or unstable grid condition.
Proposed Actions for End-user: Check the breaker and switch on the AC side, check AC wiring, consult utility power supplier.
Proposed Actions for Professionals: Check reading value of AC grid, system connection, consult utility power supplier, monitor frequency and voltage using inverter software, change parameters if necessary.

Fault Message: No Utility
Fault Definition: The inverter is not able to detect AC voltage.
Possible Causes: Grid is not available, incorrect AC connection, AC switch between inverter and utility is not ON.
Proposed Actions for End-user: Ensure breaker and switch on AC side are closed, check AC wiring.
Proposed Actions for Professionals: Same as for end-users but if the problem persists, replace the inverter.

Fault Message: PV over Voltage
Fault Definition: The detected PV voltage is higher than the specification.
Possible Causes: PV array voltage is too high, DC input side of the inverter is abnormal.
Proposed Actions for End-user: Open DC connection and reconnect, call local service if fault continues.
Proposed Actions for Professionals: Check open PV voltage, ensure it's used within specification, replace the inverter if necessary.

Fault Message: Consistent Fault
Fault Definition: The readings of 2 microprocessors are inconsistent.
Possible Causes: Software problem, circuits inside the inverter are abnormal.
Proposed Actions for End-user: Open all DC connections of the inverter, wait, reconnect, and check.
Proposed Actions for Professionals: Same as for end-users but update the firmware or replace the inverter if the fault continues.

Fault Message: Inverter Failure (Over Temperature)
Fault Definition: The detected temperature is high.
Possible Causes: Ambient temperature is too high, heat dissipation problem.
Proposed Actions for End-user: Check ambient temperature, space near the heat sink, remove any obstacles.
Proposed Actions for Professionals: Ensure installation location is not directly in the sun, check air flow, replace inverter if necessary.

Warning: Dangerous high voltage exists on both DC and AC wires and connections. For end-users, please do NOT touch any live parts.

Inverter Warnings

Warning Code: W65
Description: The inverter is reducing the power supplied to the grid due to out-of-range voltage/frequency or by telecontrol command setting.

Warning Code: W69
Description: AC network voltage out of tolerance. The inverter waits for the parameter to return within limits. If the warning persists and the network voltage is within the tolerance range, contact customer service.

Warning Code: W70
Description: AC network frequency out of tolerance. The inverter waits for the parameter to return within limits. If the warning persists and the network frequency is within the tolerance range, contact customer service.

Warning Code: W74
Description: Clock battery low or not working. Replace the battery.

Plant Warnings

Warning Code: W01
Description: Over Temperature Derating. Power limitation to prevent device overheating. Ensure the inverter is placed in a cool and well-ventilated environment.

Warning Code: W02
Description: Under Temperature Derating. Power limitation due to low temperature. Wait for the inverter to reach thermal regime. Ensure the inverter is placed in a sheltered environment and within the operating temperature range.

Warning Code: W05
Description: Low Irradiance. The inverter is waiting for sufficient photovoltaic energy for power supply to the grid.

Warning Code: W07
Description: Fault in External SPD. One or more external surge protection devices (SPD) are faulty. Proceed with replacement.

Warning Code: W58-W61
Description: External Warning associated with digital input IN1-IN4.

Inverter Alarms

Alarm Code: A01
Description: Remote Shutdown Commanded. Verify if the remote shutdown command is active.

Alarm Code: A03
Description: GFCI fault. Anomaly in the ground current measurement system (GFCI sensor). Contact customer service.

Alarm Code: A07
Description: AC connection system fault. If the contactors do not operate correctly, the inverter does not connect to the grid for safety reasons. Contact customer service if the alarm persists.

Alarm Code: A14
Description: Digital system anomaly. If the fault occurs frequently, contact customer service.

Alarm Code: A70
Description: Maintenance Active. The inverter is in maintenance state. Contact customer service.

Alarm Code: A72
Description: Inverter Anomaly. Internal control detected a hardware malfunction. If the anomaly is persistent or occurs frequently, contact customer service.

Alarm Code: A78
Description: Autotest Failed. Interface protection system fault. Contact customer service.

Alarm Code: A79
Description: DC Current Feed. The DC current fed into the grid has exceeded the allowed limit. Contact customer service if the anomaly occurs frequently.

Plant Alarms

Alarm Code: A02
Description: Dangerous variation in differential current or high earth leakage. Integrated differential current monitoring is important for personal protection. Verify the plant's parasitic capacity to earth is below 100nF/kWp if the alarm persists unjustifiably.

Alarm Code: A04
Description: Insulation Alarm. The insulation resistance (Riso) of the photovoltaic plant to earth is insufficient. Verify there are no earth leakages in the photovoltaic plant and that the plant's parasitic capacity to earth is below 100nF/kWp.

Alarm Codes: A58-A61
Description: External Alarm associated with digital input IN1-IN4.

Alarm Code: A68
Description: High Temperature Alarm. The inverter's temperature is above the maximum operating limit. Ensure the inverter is placed in a cool and well-ventilated environment.

Alarm Code: A73
Description: DC Overvoltage. Disconnect the photovoltaic field to avoid damage to the device. Check the plant configuration and that the maximum voltage of the photovoltaic field is within the accepted range before reconnecting the inverter.

Alarm Code: A76
Description: Low Ambient Temperature. The ambient temperature is below the minimum operating limit. Ensure the inverter is placed in a sheltered environment and within the operating temperature range.

Alarm Code: A80
Description: DC Overcurrent. Detected DC current is above the operating range. Check the plant configuration and that the maximum current of the photovoltaic field is within the accepted range before reconnecting the inverter. Contact customer service if necessary.

Operating States

Maintenance Mode: Maintenance mode active.
Standby: Inverter in Standby due to remote Stop command or manual setting from display.
Night Mode: Night mode, insufficient irradiation. Verify the exposure of photovoltaic panels, the wiring of the photovoltaic plant, and the correct polarity of DC connections to the inverter.
Low Irradiance: Insufficient irradiance to connect to the grid.
AC Network Check: Checking electrical network parameters within the range.
Insulation Check: Checking insulation resistance to earth.
Conditions Check for Startup: Checking sufficient energy from the photovoltaic field.
GFCI and AC Output Contactor Test: Inverter ON, operating correctly.
Inverter OFF due to Alarm: Inverter stopped due to detected alarm.

Standard States

Code S66: AC Network Ok. Voltage and AC Frequency within tolerance range.
Code S67: Inverter ON, operating correctly.
Code S80: Reactive Power Compensation. The inverter is managing reactive power according to national standards.

Models: SUNSYS HOME 2254 3954 2265 3965 6065
SUNSYS PRO 18K 24K
SUNSYS STATION 39K 56K 81K 120K 240K 39KMT 55KMT 80KMT 120KMT 240KMT