APsystems QS1 - 6.2 Troubleshooting Non-Operating Microinverters; 6.3 Maintenance

QS1 Installation/User Manual
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6.Troubleshooting
6.2 Troubleshooting a non-operating APsystems Microinverter
There are two possible overall areas of trouble:
A. The Microinverter itself may be having problems.
B. The Microinverter itself is working fine but it is having trouble communicating with the
ECU. The items below refer to Microinverter issues, not communication issues (addressed in
the ECU manual).
A quick way to tell whether the issue is the Microinverter or communication problem with the
ECU:
1.
Diagnosing from the Microinverter:
A red light – either blinking or solid on the
Microinverter, or no light at all. No light, or a red light, means it is definitely a Microinverter
problem.
2. Diagnosing from the ECU:
a. No-Data-Display: This is probably a communication issue- not a Microinverter
problem.
b. Problems with erratic display:
Data is displayed for some period and then no data is
displayed: most likely a communication issue.
c. 0 watts, or 2 watts: Possibly a Microinverter problem
d. Erratic data display
that is not coordinating with data displays from other units: most
likely a Microinverter problem.
To troubleshoot a non-operating APsystems Microinverter, Follow
the steps below in order to:
1. Verify the utility voltage and frequency are within ranges shown in the Technical Data
section of this manual.
2. Check the connection to the utility grid. Verify utility power is present at the inverter in
question by removing AC, then DC power. Never disconnect the DC wires while
the microinverter is producing power. Reconnect the 1st module and check that
the LED flashes green 3 times.
3. Check the AC branch circuit interconnection between all the microinverters. Verify each
inverter is energized by the utility grid as described in the previous step.
4. Make sure that any AC breaker are functioning properly and are closed.
5. Check the DC connections between the microinverter and the PV module.
6. Verify the PV module DC voltage is within the allowable range shown in the Technical
Data of this manual.
7. If the problem persists, please call APsystems Customer Support.
Do not attempt to repair the APsystems Microinverter. In the event of failure of the
troubleshooting methods and after validation of the fault by the APsystems
technical service, please return the defective microinverter to your distributor for
replacement.
.
6.3 Maintenance
No need to Maintenance.