SMA America, LLC
Commissioning
Installation Guide
SB20_25_30HFUS-eng-IUS113711
63
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
®
section 690.5. The PV array normally operates in a
grounded configuration. Depending on the type of system, the array’s negative or positive conductor
is connected to the grounding system inside the inverter through the SMA Plug-in Grounding as a part
of the UL1741 listed ground fault detection system. The GFDI protection is active whenever there is
sufficient DC voltage to turn on the LCD in the Sunny Boy.
To commission the Sunny Boy, follow these simple instructions:
1. Make sure any covering placed over the PV array is removed.
2. If a multi-function relay is present, connect the multi-function relay power supply.
3. Connect the grid voltage to the Sunny Boy by switching on the main AC circuit breaker in the
main utility panel.
4. Switch the SMA DC-Disconnect to position ”On”.
WARNING
Follow the steps in the commissioning procedure in the order they are presented. Deviating
from these procedures could expose you to lethal voltages that can cause serious injury
and/or death.
CAUTION
Follow the steps in the commissioning procedure in the order they are presented. Deviating
from these procedures could cause irreversible damage to the Sunny Boy and void the
warranty.
