SMA SC 200 - Manual (Page 58)

Grid Monitoring SMA Solar Technology AG
58 SC-BEN100262 User Manual
11 Grid Monitoring
The Sunny Central monitors the energy supply grid for breaches of adjustable upper or lower limit
values. If the upper or lower limit values are breached for a relevant adjustable time, the Sunny
Central disconnects itself from the grid for security reasons.
The following limit values are monitored:
• Voltage decrease protection U< and U<<
• Voltage increase protection U> and U>>
• Frequency decrease protection f<, f<< and f<<<
• Frequency increase protection f> and f>>
For each limit value, you can set a trigger delay time, for the duration of which the grid fault must be
present before the Sunny Central disconnects from the grid.
Thus, for example, at an overfrequency of 50.5 Hz triggering can be set to take place after 1 second,
and at an overfrequency of 51.5 Hz after only 0.1 seconds.
You can preset the limit values and the triggering time manually. For voltage monitoring, it is possible
to set two limits each for overvoltage and undervoltage. For frequency monitoring, you can set 2
upper limits and 3 lower limits.
11.1 Grid Connection after Fault Clearance
After clearance of a grid fault, reconnection can only occur once the grid voltage has returned to
within the set connection limits: (e.g. VCtlOpMinNom) for the duration of the grid monitoring time
(GriGrdMonTm).