enphase M250 Quick Install Manual page 2

INSTALLATION
Remove the Failed M215 or M250
1
A ) De-energize AC by opening the branch circuit breaker.
B ) Disconnect the failed microinverter AC cables from the Engage Cable.
C ) Cover PV modules with opaque covers if necessary.
D ) Using a current probe, verify that no current is flowing in DC wires.
E ) Disconnect the DC connectors and the grounding electrode conductor
(GEC), if necessary. The new microinverter will not require a GEC.
F ) Remove the failed microinverter from the racking.
2
Mount the Replacement Microinverter
A ) Connect the Enphase DC dongle to the replacement microinverter.
Make sure it is are fully seated.
B ) Attach the M215 or M250 replacement microinverter to the racking,
bracket side up (as shown) and under the PV module, away from rain
and sun. Allow a minimum of 1.9 cm (0.75 inches) between the roof
and the microinverter. Also allow 1.3 cm (0.50 inches) between the
back of the PV module and the top of the microinverter.
WARNING: Install the microinverter
under the PV module to avoid direct
exposure to rain, UV, and other harm-
ful weather events. Do not mount
the microinverter upside down.
C ) Take the removable serial number
label from the replacement
M215 or M250 and attach it to your
copy of the installation map in its
location or note the location for entry
into the array map in Enlighten. You
will need to scan the label later and use the Enphase
Array Builder to assign their positions in the array.
NOTE: There is no need to use a GEC with the replacement M215 or M250.
D ) Tighten the mounting fasteners (1/4-inch or 5/16-inch) as follows. Do
not over-tighten.
• 6 mm (1/4 inches) mounting hardware: 5 N m (45 to 50 in-lbs)
minimum.
• 8 mm (5/16 inches) mounting hardware: 9 N m (80 to 85 in-lbs)
minimum.
• When using UL 2703 mounting hardware, use the manufacturer's
recommended torque value
Mounting slots
DC connector
AC connector
3 Connect Replacement Microinverters to Cabling
A ) Connect the AC adapter cable to the AC connector of the replace-
ment M215 or M250.
B ) Attach the AC cable adapter to the Engage Cable.
C ) Listen for clicks as the connectors engage.
Cable filter box
AC adapter cable Q-ET-2LL
(840-00438)
Affix serial
number labels
LED
Connects to
Engage Cable
Connects to
Microinverter
AC connector
4
Manage the Cabling
A ) Check that any unused connectors on the AC cable are equipped
with Enphase Sealing Caps (ET-SEAL). Listen for a click as the sealing
caps engage.
WARNING: Install sealing caps on all unused AC connectors as these
connectors become live when the
system is energized. Sealing caps are
required for protection against moisture
ingress.
B ) Use cable clips or tie wraps to attach
the cable to the racking. Add one at
least every 1.8 m (6 feet).
C ) Dress any excess cabling in loops so
that it does not contact the roof. Do not
form loops smaller than 12 cm (4.75 inches) in diameter.
D ) Mount the AC adapter cable filter box onto the rail using a cable clip
inserted into the mounting feature on the housing.
5
Connect the PV Modules
DANGER! Electric shock hazard. The DC conductors of this PV system are
ungrounded and may be energized.
A ) Connect the DC leads of each PV module to the DC connector of the
replacement microinverter.
B ) Check the LED on the connector side of the microinverter. The LED
flashes six times when DC power is applied.
6 Energize the System
A ) Turn ON the AC disconnect or circuit breaker for the branch circuit.
B ) Turn ON the main utility-grid AC circuit breaker. Your system will start
producing power after a five-minute wait time.
C ) Check the LED on the connector side of the microinverter:
LED Indicates
Flashing Normal operation. AC grid function is normal and there is
green communication with the Envoy.
Flashing The AC grid is normal but there is no communication with
orange the IQ Envoy. This is normal until you complete Step 7.
Flashing red The AC grid is either not present or not within specification.
Solid red There is an active "DC Resistance Low, Power Off" (GFI
Tripped) condition. Use Enlighten Manager to reset it or refer
to the Enphase Envoy Installation and Operation Manual at:
http://www.enphase.com/support
7
Retire the Unit and Update the Array
A ) While still at the site, start a device scan at the Envoy to detect the
new unit:
For older Envoys, press and hold the Envoy Menu button on
•
the right edge of the Envoy. After two seconds the Envoy menu
appears. Continue holding the Menu button. When the LCD screen
displays Enable Device Scan, release the Menu button.
For Envoy-S or IQ Envoy, press the Device Scan button (lower
•
button). The Device Communications LED
during the scan. (Alternatively, you can initiate a scan using
Installer Toolkit.)
NOTE: Complete the following steps when you are back in the office.
B ) Retire the replaced microinverter, by logging into Enlighten Manager
and locating the array in your Installer Dashboard. Access the array
and click on the unit that has been replaced. Click the device serial
number and then click the Retire button at the top of the screen.
C ) Place the new microinverter in the virtual array by returning to the
array overview screen, and clicking on the gear icon in the upper right.
Scroll down to the Array Details pane, and open Array Builder. Locate
and click on the unit that has been replaced and click Unassign on the
top toolbar. Drag the newly installed unit in the empty module position
in the array, and click Save.
Cable clip
for more information.
flashes green