SMA SC 500HE-20 - Manual (Page 28)

3 Product Description SMA Solar Technology AG
28 SCxxxHE-20-BE-BEN111210 Operating Manual
If the insulation is intact, the error "3505 ‒ ground fault ignored" appears. This error indicates that the
PV array is operating without a grounding connection. If the insulation monitoring process is complete,
the "RemMntSvc" parameter should be set to Off and thus allows the PV array to operate with a
grounding connection.
If, after approx. 5 minutes, one of the failures "3501 ‒ insulation failure", "3504 ‒ insulation failure
ignored" or "3601 ‒ Warning insulation failure" is displayed, the insulation is defective. In this case,
an electrically qualified person must check and, if necessary, repair the insulation and confirm the
failure.
3.6 Grid Management
3.6.1 Requirements
In Germany, PV plants with more than 100 kWp of connected power must be integrated into a feed-
in and grid management system. First and foremost, the grid operator must be able to limit the power
of the PV plant by remote control and temporarily reduce it to zero in critical cases. The relevant
control commands of the grid operator must therefore be transmitted to the Sunny Central quickly and
reliably for implementation.
The following illustration shows how the specifications of the grid operator are implemented. The
Power Reducer Box sends the specifications of the grid operator to the inverters.
Figure 11: Principle of grid integration
Besides the Power Reducer Box, there are two other options for meeting the requirement of grid
management:
• Receiving the signals via 2 analog inputs on the Sunny Central
• Manually adjusting the specifications via parameters