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Figure 5-22 Locking a nut 
 
 
Step 6  Take off the blue dustproof plugs from the bottom of the DC input connectors. 
Step 7  Insert the positive and negative connectors into the corresponding DC input terminals of the 
SUN2000 until a "click" sound is heard, as shown in Figure 5-23. 
Figure 5-23 Positive and negative connectors