SMA Sunny Island 2012 Technical Description page 64

Sunny Island Electrical Connection
Operating principles of the relays
The relays are changeover contacts; they can be used as normally closed contacts
(NCC) or as normally open contacts (NOC).
The relay functions are listed as NO contact functions, in other words, the contact is
closed if the relay is activated by selecting the function. An exception is "Alm" (alarm), in
which case the relay has a break function. This means that the relay is normally activated,
opening the contact. Only in case of a failure is it deactivated and closes the contact
(activating, for example, a warning light).
Please note:
You can only assign one function to the relay.
roceed as follows when installing the relay connections:
P
1. Pierce the rubber plugs with a pointed tool.
2. Fit the cables with wire sleeves.
3. Introduce both cables from the outside
through the opening.
4. Insert the wires in the "Relay1" or "Relay2"
sockets of the 3-pole terminal clamps
provided.
5. Tighten the screws on the sockets.
6. Pay attention to the designation of the pins:
- NC: Normally closed (closed when
idle)
- C: Contact (operation contact)
- NO: Normally opened (opened in
standby)
7. Insert the plug into the appropriate socket
on the board.
64 SI2012_2224-TEN082311
SMA Solar Technology AG
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Technical Description
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