Maintenance
SMA America, LLC
86
SB50US-80US-IA-en-36
Installation Manual
10.5.2 Exchanging PV String Fuses within the DC disconnect
1. Disconnect the Sunny Boy on the AC and DC sides.
2. Wait 5 minutes until the residual voltage has been drained.
3. Open the DC disconnect as described in section 6.4 ”Opening the DC Disconnect” (page 40).
4. Replace the fuse (1, 2, 3, or 4).
5. Close the DC disconnect as described in section 6.9 ”Closing the DC Disconnect” (page 57).
6. Switch the AC and DC disconnect switches back on.
1
3
2
4
GROUNDING
ELECTRODE
CONDUCTOR
COMBINED
1
2
3
4
UNGROUNDED
GROUNDED
L1 L2 N
1
3
2
4
COMBINED
1
2
3
4
UNGROUNDED
GROUNDED
