SMA SB 3000-US - Manual (Page 59)

SMA America, LLC 9 Opening and Closing
Installation Manual SB30-40-US-IA-en-34 59
2. Attach the enclosure lid to the enclosure using all 4 screws and conical spring washers:
• Attach 1 conical spring washer on each screw.
Here, the grooved side of the conical spring
washer must point to the screw head.
• Tighten the 4 screws with conical spring
washers through the drill holes in the enclosure
lid into the threaded bores of the enclosure
(torque: 53 in-lb. (6 Nm)).
☑ The teeth of the conical spring washer press into
the enclosure lid. This grounds the enclosure lid.
3. Ensure that the enclosure lid is supported evenly on the enclosure.
9.3 Opening the DC Disconnect
1. Disconnect the AC miniature circuit-breaker and secure against re-connection.
2. Turn the rotary switch of the DC Disconnect to the
Off position and secure against re-connection.
Danger to life due to high voltages in DC connecting terminal plates with connected
PV modules
Death or serious injury as a result of touching the DC connecting terminal plates of the
DC Disconnect. High voltages that can result in electric shocks are present in the live components
of the DC connecting terminal plates.
• Do not touch the live components of the DC connecting terminal plates.