Sma SUNNY CENTRAL User Manual download pdf (Page 15)

SMA Solar Technology AG Description of the Sunny Central

User Manual SC-BEN092751 15

Stop

The Sunny Central is deactivated. The Sunny Central remains in this mode until the start-up key switch

is turned to the start position.

Wait

If the input voltage is below the defined start voltage "UpvStart", the Sunny Central resides in "Wait"

mode. The value of the UpvStart setting is shown in the Sunny Central Control's display.

Startup

If the input voltage is above the start voltage "UpvStart", the Sunny Central waits until the time defined

by the parameter "Tstart" has passed. If the input voltage has not fallen below the start voltage

"UpvStart" during this period, the Sunny Central starts up.

The AC contactor is closed and the Sunny Central is isolated. Once the Sunny Central is ready for

operation, it begins grid feeding.

MPP Load Operation

After successful activation, the Sunny Central seeks the solar generator's maximum power point

(MPP), and begins feeding into the grid.

Shutdown

The Sunny Central shuts down if:

• the power measured during the interval "Tstop" is less than "PpvStop",

• a failure occurs which requires a shutdown of the Sunny Central, or

• the start-up key switch is set to "Stop".

Failures

If a failure occurs during operation, the Sunny Central shuts down and the failure is shown as a

disturbance in the Sunny Central Control's display. Refer to section 9 "Failures and Warnings"

(page45) for a list of disturbances.

Start Voltage UpvStart

The start voltage UpvStart must be adjusted for the solar generator which is connected to

the Sunny Central.

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Sma SUNNY CENTRAL User Manual Page 15