SMA SC 250U - Manual (Page 25)

SMA America, LLC 5 Installation of the Disconnect Unit
Installation Guide DISU_SCUS-IA-IUS111711 25
5.3 Opening the Disconnect Unit
☐ The front consists of a single front plate fixed by screws. Regard the heavy weight of the front
plate. Two persons are needed to move the front plate of this variant of the Disconnect Unit.
1. Shutdown the Sunny Central as descibed in the user manual of the Sunny Central.
2. Unscrew the 3 screws at the handles on the left side
of the front plate.
3. Turn all switches of the Disconnect Unit to the left
into ”Off” position. You need to push/pull sharply
in order to move the switches.
4. For Disconnect Unit for Sunny Central 500HE‑US and Sunny Central CP:
• Push the red button of the AC disconnect.
5. %"/(&3
High voltages are present in the inverter.
Death resulting from electric shock will result.
Even after switching all switches to the ”Off” position, there could be high voltages from the
Sunny Central and the power distribution grid at the busbars and at the switches and their
connection points.
• If the inverter has already been in operation, wait for at least 8 minutes for all internal
power supplies to discharge.
• Disconnect the unit from power distribution grid.
• Make sure that there is no voltage at the busbars and at the connection points of the
switches.