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6 Electrical connection
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 53 in-lbs.
(6 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.
6.7 Affixing information about grounded path
1. Determine if the PV plant is positive or negative grounded:
In a PV plant only the cables of the ungrounded path are disconnected by breakers, DC load
break switches and fuses.
To determine if the PV system is positively or negatively grounded, check the routing of the DC
cables for disconnectors and fuses. DC cables without any disconnection belong to the
grounded DC path.
If the DC cable without disconnectors is positive: the PV plant is positively grounded.
If the DC cable without disconnectors is negative: the PV plant is negatively grounded.
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DisconACDC_SCUS-IUS103110
SMA America, LLC
Installation Guide
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