SMA SC 400HE - Manual (Page 26)

3 Product Description SMA Solar Technology AG
26 SC4-63HE-BE-BEN103280 Operating Manual
3.9 External Grid Monitoring Relay
Depending on the order, the Sunny Central is also equipped with a separate grid monitoring relay
instead of the integrated grid monitoring feature.
The external monitoring relay monitors the grid, detects breaches of the grid limits and transmits an
error message to the Sunny Central. The set grid limits in the external monitoring relay always have
priority over the settings in the Sunny Central Control.
Figure 12: External grid monitoring relay in the Sunny Central
External grid monitoring relay used
The Multi Function Relay Protection MFR 11 device from the Woodward Gavenor Company is used
as an external monitoring relay.
Position Description
A 2-line display
B Control buttons
C Side input and control dial