Commissioning SMA America, LLC
62 SB30-40US-IUS103030 Installation Guide
7 Commissioning
All Sunny Boy inverters have a sophisticated system for detecting and responding to PV array ground
faults as required by National Electrical Code
®
. The ground fault protection device is active
whenever there is sufficient DC voltage to turn on the LCD in the Sunny Boy.
Check the following requirements before commissioning:
• AC cable correctly connected
• DC cable correctly connected
• securely fastened enclosure lid
• The line circuit breaker is laid out correctly, if used.
1. Make sure any covering placed over the PV array is removed.
2. Connect the grid voltage to the Sunny Boy by switching on the main AC circuit breaker in the
main utility panel.
3. Switch the external DC disconnect to position „on“.
or
Switch the SMA DC Disconnect to the “1“ position.
If there is sufficient sunlight available, the Sunny Boy will enter the “Wait” mode at this time and
the green LED will begin to blink.
4. If no AC faults are detected, the “Wait” mode will end after 10 seconds and the green LED will
stop blinking, remain on and the Sunny Boy will begin to operate normally. If an AC fault was
registered, the Sunny Boy will wait 5 minutes prior to starting.
If the inverter is not operating as expected after commissioning has been completed, refer to section
8”Displays and messages” (page63) and to Section 9”Troubleshooting” (page77).
DANGER
Deviating from the procedure described in this chapter could expose you to lethal voltages.
Death or serious injury.
• Commission the Sunny Boy in the order described in the following procedure.
If there is a ground fault in the array, the message “EarthCurrentMax” will be displayed
and the GFDI fuse may clear.
• If this message is encountered, switch off the DC and AC disconnects to the inverter
and troubleshoot the array.
Anytime the AC power is disconnected from the inverter - either manually or as a result of
an AC disturbance - the inverter will wait 5 minutes after the AC power has been restored
to reconnect.
• When servicing the inverter, always disconnect the DC first, then the AC.
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