APsystems YC500-A Installation/User Manual
15
WARNING:
The APsystems microinverter is powered by PV module
DC power. AFTER disconnecting the DC power, when reconnecting
the PV modules to the microinverter, be sure to watch for the four
short LED flashes - one red, and three green.
A non-operating APsystems microinverter
There are two possible overall areas of trouble:
A.
The microinverter may be having problems, or
B.
The microinverter 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 a
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 more than likely 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:
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. Re-connect the DC module connectors and
watch for one red followed by three short green LED flashes.
Troubleshoot a Non-operating APsystems microinverter. . .
continued on next page