APsystems YC600 Manuale utente

How To Troubleshoot an Inoperable APsystems

Microinverter

A flashing red LED indicates the AC grid is either not present or not within specification.

The microinverter does not sense that the utility grid is within voltage/frequency

specifications, and cannot produce power until this is resolved. To troubleshoot an

inoperable APsystems microinverter, follow the steps in the order shown to diagnose

your solar system.

* WARNING: Risk of electric shock. Always de-energize the AC branch circuit before

servicing. Never disconnect the DC connectors under load.

* WARNING: The APsystems Microinverters are powered by DC power from the PV

modules. Make sure you disconnect the DC connections and reconnect DC power and

then watch for three green blinks after connection to DC power.

Troubleshooting an APsystems System - 15 Steps:

1. Make sure AC breakers and disconnects are closed (off).

2. Check the connection to the utility grid and verify that the utility voltage is within

allowable ranges.

3. Verify that AC line voltages at all solar power circuit breakers at the load center and

sub-panels are within the ranges shown in the following table.

4. Verify that AC line voltage at the junction box for each AC branch circuit is within the

ranges shown in the following table:

240 Volt AC, Single Phase or

Three Phase

208 Volt AC, Three Phase

L1 to L2

211 to 264 VAC

L1 to L2 to L3

183 to 229 VAC

L1, L2 to

neutral

106 to 132 VAC

L1, L2, L3 to

neutral

106 to 132 VAC

5. Using an APsystems disconnect tool, disconnect the AC cable for the microinverter in

question from the trunk cable.

6. Verify that utility power is present at the microinverter by measuring line to line and

line to neutral at the trunk cable connector.

7. Visually check that the AC branch circuit connections (trunk cable and AC

connections) are properly seated. Reseat if necessary. Check also for damage, such as

rodent damage.

8. Make sure that any upstream AC disconnects, as well as the dedicated circuit

breakers for each AC branch circuit, are functioning properly and are closed.

9. Disconnect and reconnect the DC PV module connectors. The Status LED of each

microinverter will light solid green three times in a few seconds after connection to DC

power and then blink green every ten seconds indicate normal start-up operation about

five minutes after connecting to DC power. The LED subsequently resumes normal

operation if the grid is present. See page 15 of the Installation and Operation Manual

for normal LED operation. (YC600/QS1)

10. Clamp onto one of the DC cables with a multimeter from the PV module to measure

micro inverter current. This will be under one Amp if AC is disconnected.

11. Verify the PV module DC voltage and current is within the allowable range shown in

“Specifications” on page 20 of the manual. (YC600/QS1)

12. Swap DC leads with a known good, adjacent PV module. If after checking the EMA

periodically (this may take up to 30 minutes), the problem moves to the adjacent

module, this indicates that the PV module isn’t functioning correctly. If it stays in place,

the problem is with the microinverter. Call APsystems Technical Support for help in

reading the microinverter data and for help in obtaining a replacement microinverter, if

needed.

13. Check the DC connections between the microinverter and the PV module. The

connection may need to be tightened or reseated. If the connection is worn or damaged,

it may need replacement.

14. Verify with your utility that line frequency is within range (some multimeters have a

frequency function to check this easily)

15. If the problem persists, please email directly to this response. Please do not reply to

auto-generated emails or emailing [email protected]; not emailing this

email directly can cause your request to take longer to resolve with the possibility of lost

information. Thank you.

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