Table of Contents
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Table of Contents
6
Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.1
Overview electrical connections . . . . . . . . . . . . . . . . . . . . . . . . 30
6.1.1
Disconnect Unit for Sunny Central 250U/500U . . . . . . . . . . . . . . . . . . . . . 30
6.1.2
6.2
Cable requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.1
Cable requirements for DC, AC and PE connection . . . . . . . . . . . . . . . . . . . 32
6.2.2
Additional cable requirements for DC connection . . . . . . . . . . . . . . . . . . . . 32
6.3
Connecting DC cables to the Disconnect Unit . . . . . . . . . . . . . 33
6.3.1
Connection sequence DC switches 600 V . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.3.2
6.3.3
Connecting DC cables to DC load break switch with cable lugs . . . . . . . . . 36
6.3.4
Connecting sequence for single DC load break switch, 600 V . . . . . . . . . . 38
6.3.5
Connecting sequence for single DC load break switch, 1,000 V. . . . . . . . . 39
6.4
Connecting AC cables to the Disconnect Unit . . . . . . . . . . . . . 40
6.4.1
Additional cable requirements for AC connection . . . . . . . . . . . . . . . . . . . . 40
6.4.2
Arranging AC cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.4.3
Overview AC connection to power distribution grid. . . . . . . . . . . . . . . . . . . 42
6.4.4
Overview AC connection to the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.4.5
Connecting AC cables to busbars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.5
Connecting protective earth . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.5.1
Additional cable requirements for PE connection . . . . . . . . . . . . . . . . . . . . . 53
6.5.2
Connecting protective earth to busbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.6
Closing the Disconnect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.7
Affixing information about grounded path . . . . . . . . . . . . . . . . 58
7
Operating the Disconnect Unit . . . . . . . . . . . . . . . . . . . . . 60
7.1
Arrangement of the switches. . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.2
Switching on the Disconnect Unit . . . . . . . . . . . . . . . . . . . . . . . 61
7.3
Switching off the Disconnect Unit . . . . . . . . . . . . . . . . . . . . . . . 62
7.4
Securing against reconnection - Lock-Off function. . . . . . . . . . 63
8
Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8
DisconACDC_SCUS-IUS103110
SMA America, LLC
Installation Guide
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Table of Contents
