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Power-Off for Troubleshooting
Context
To prevent personal injury and equipment damage, perform the following procedure to power off the solar inverter for troubleshooting or replacement.
- When a solar inverter is faulty, try to avoid standing in front of the solar inverter.
- If the LED1 indicator of the inverter is off, the switches are in the OFF position, do not operate the DC switches of the inverter. In this case, go to Step 4.
- Do not operate the DC switch on the solar inverter before you finish 3 to 5.
- The DC switch can be automatically disconnected when an internal fault is detected in an inverter. Do not turn on the switch before the fault is cleared.
- If the AC switch between the solar inverter and the power grid has automatically disconnected, do not turn on the switch before the fault is rectified.
- Before power-off for troubleshooting, do not touch the energized components of the solar inverter. Otherwise, electric shocks or arcing may occur.
Procedure
- Wear proper personal protective equipment (PPE).
- If the solar inverter is not shut down due to a fault, send a shutdown command on the SUN2000 app, SmartLogger, or management system. If the solar inverter has shut down due to a fault, go to the next step.
- Turn off the AC switch between the solar inverter and the power grid.
- Measure the DC current of each PV input string using a clamp meter that is set to the DC position.
- If the current is less than or equal to 0.5 A, go to the next step.
- If the current is higher than 0.5 A, wait until the solar irradiance decreases and the PV string current decreases below 0.5 A at night, and then go to the next step.
- Open the maintenance compartment door, install a support bar, and use a multimeter to measure the voltage between the AC terminal block and the ground. Ensure that the AC side of the solar inverter is disconnected.
- Turn off all DC switches of the inverter and ensure that all switches are set to OFF. If the DC switches of the inverter have been automatically turned off, go to the next step.Figure 8-1 Power-off for maintenance
- Wait for 15 minutes and troubleshoot or repair the inverter.
- Do not open the host panel for maintenance if the solar inverter is emitting odor or smoke, or has obvious exceptions.
- If the solar inverter does not emit odor or smoke and is intact, repair or restart it based on the alarm handling suggestions. Do not stand in front of the solar inverter during the restart.
