SMA SC 250U - Manual (Page 59)

SMA America, LLC 6 Electrical connection
Installation Guide DISU_SCUS-IA-IUS111711 59
9. Make sure that all switches function properly by switching them into position ”On” and back to
position ”Off”.
The switches function properly if there is no backlash of the shafts and the switches make a clear
sound. Re-adjust if necessary.
10. When all switches function properly: switch all
switches into position ”On” and insert 3 screws with
seal washers into the holes at the handles at the left
side. Tighten the screws with a torque of 44 in-lbs
(5 Nm).
11. Switch all switches into position ”Off”
12. For Disconnect Unit for Sunny Central 500HE-US/
CA/CP: make sure that the ground strap at the
clamp of the AC switch is correctly connected to the
flap and that it is not jammed between enclosure
and flap. Close the flap after check.