Page 22
Copyright
2011 Siemens Industry, Inc.
141-00015, Rev 01
Troubleshooting an Inoperable Microinverter
WARNING
: Be aware that only qualified personnel should troubleshoot the PV array or
the Siemens Microinverter.
DANGER
Hazardous voltage. Will cause death or serious injury.
Turn off Power before
working on this equipment. Always disconnect AC power before disconnecting the PV
module wires from the Siemens Microinverter.
DANGER
Hazardous voltage. Will cause death or serious injury.
Turn off Power before
working on this equipment. Never disconnect the DC wire connectors under load. Ensure
that no current is flowing in the DC wires prior to disconnecting. An opaque covering may
be used to cover the module prior to disconnecting the module.
WARNING
: The Siemens Microinverters are powered by DC power from the PV
modules. Make sure you disconnect the DC connections and reconnect DC power to
watch for the six short LED blinks one minute after DC is applied.
To troubleshoot an inoperable microinverter, follow the steps in the order shown:
1.
Check the connection to the utility grid and verify the utility voltage and frequency are
within allowable ranges shown in the Technical Data section on page 25 of this
manual.
2.
Verify that AC line voltage at the service entrance conductors and at the junction box
for each Siemens branch are within the ranges are shown in the following table:
120/240 VAC or 208Y/120 VAC Single Phase
208Y/120 VAC Three Phase
L1 to L2
211 to 264 Vac
L1 to L2 to L3
183 to 229 Vac
L1 to neutral
L2 to neutral
106 to 132 Vac
L1 to neutral
L2 to neutral
L3 to neutral
106 to 132 Vac
3.
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. After one minute, watch for six short
LED blinks.
4.
Check the AC branch circuit interconnection harness between all the microinverters.
Verify that each inverter is energized by the utility grid as described in the previous
step.
5.
Make sure that any upstream AC disconnects, as well as the dedicated circuit-
breakers for each microinverter branch circuit, are functioning properly and are
closed.
6.
Verify the PV module DC voltage is within the allowable range shown in the
Technical Data section on page 25 of this manual.
7.
Check the DC connections between the microinverter and the PV module.
8.
If the problem persists, please call Siemens customer support at 1-800-241-4453 or
at [email protected].
