SMA SC 400HE - Manual (Page 55)

SMA Solar Technology AG 4 Sunny Central Control
Operating Manual SC4-63HE-BE-BEN103280 55
4.9 Grid Monitoring
4.9.1 How Grid Monitoring Works
The Sunny Central monitors the power distribution grid to make sure it stays within a definable range
of limiting values. If these limiting values are exceeded for a set time period, the Sunny Central will
disconnect itself from the grid for safety reasons.
The following limiting values are monitored:
• Voltage loss protection
• Voltage increase protection
• Frequency loss protection
• Frequency increase protection
A tripping delay time for how long the grid failure must be present before the Sunny Central
disconnects from the grid can be set for each limiting value.
4.9.2 Grid Monitoring for Grid Voltage
You can manually specify the limiting values and tripping time. For voltage monitoring, 2 limits can be
set for both overvoltage and undervoltage.
Figure 18: Temporal behavior of the Sunny Central when exceeding the grid limits
Object Parameter Description
A
VCtlhLimTm Delay time for grid limit level 2
B VCtlhhLimTm Delay time for grid limit level 1