Troubleshoot An Inoperable Microinverter - enphase IQ 7 Installation And Operation Manual

Troubleshoot an Inoperable Microinverter

To troubleshoot an inoperable microinverter, follow the steps in the order shown.
WARNING: Risk of electric shock. Always de-energize the AC branch circuit before
servicing. Never disconnect the DC connectors under load.
WARNING: The Enphase 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 the solid green about six seconds after connection to DC power.
A. Make sure AC breakers and disconnects are closed.
B. Check the connection to the utility grid and verify that the utility voltage is within allowable
ranges.
C. Verify that AC line voltages at all solar power circuit breakers at the load center and
subpanels are within the ranges shown in the following table.
D. Verify that AC line voltage at the junction box for each AC branch circuit at the site is
within range:
Single-Phase Service
L1 to N 207 to 253 VAC
D. Using an Enphase disconnect tool, disconnect the AC cable for the microinverter in
question from the Enphase Q Cable.
E. Verify that utility power is present at the microinverter by measuring line to line and line to
ground at the Enphase Q Cable connector.
F. Visually check that the AC branch circuit connections (Enphase Q Cable and AC
connections) are properly seated. Reseat if necessary. Check also for damage, such as
rodent damage.
G. 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.
H. Disconnect and re-connect the DC PV module connectors. The status LED of each
microinverter will light solid green a few seconds after connection to DC power and then
blink green six times to indicate normal start-up operation about two minutes after
connecting to DC power. The LED subsequently resumes normal operation if the grid is
present. See page 20 for normal LED operation.
I. Attach an ammeter clamp to one conductor of the DC cables from the PV module to
measure microinverter current. This will be under one amp if AC is disconnected.
J. Verify the PV module DC voltage is within the allowable range shown in "Specifications"
on page 28 of this manual.
K. Swap DC leads with a known good, adjacent PV module. If after checking Enlighten
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 original microinverter. Contact
reading the microinverter data and for help in obtaining a replacement microinverter, if
needed.
L. 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.
M. Verify with your utility that line frequency is within range.
N. If the problem persists, contact Customer Support at
us/support/global-contact.
22
IQ 7 / IQ 7+ / IQ 7X / IQ 7A Installation and Operation
Three-Phase Service
L1 to L2 to L3
L1, L2, L3 to N
© 2020 Enphase Energy Inc. All rights reserved.
360 to 440 VAC
207 to 253 VAC (most models)
219 to 264 (IQ 7A models)
Enphase Customer Support
https://enphase.com/en-
for help in
141-00044-02